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1370 lines
34 KiB
1370 lines
34 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* By Ross Biro 1/23/92 */ |
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/* |
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* Pentium III FXSR, SSE support |
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* Gareth Hughes <[email protected]>, May 2000 |
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*/ |
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|
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#include <linux/kernel.h> |
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#include <linux/sched.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/mm.h> |
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#include <linux/smp.h> |
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#include <linux/errno.h> |
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#include <linux/slab.h> |
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#include <linux/ptrace.h> |
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#include <linux/tracehook.h> |
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#include <linux/user.h> |
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#include <linux/elf.h> |
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#include <linux/security.h> |
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#include <linux/audit.h> |
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#include <linux/seccomp.h> |
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#include <linux/signal.h> |
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#include <linux/perf_event.h> |
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#include <linux/hw_breakpoint.h> |
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#include <linux/rcupdate.h> |
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#include <linux/export.h> |
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#include <linux/context_tracking.h> |
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#include <linux/nospec.h> |
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|
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#include <linux/uaccess.h> |
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#include <asm/processor.h> |
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#include <asm/fpu/internal.h> |
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#include <asm/fpu/signal.h> |
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#include <asm/fpu/regset.h> |
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#include <asm/debugreg.h> |
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#include <asm/ldt.h> |
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#include <asm/desc.h> |
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#include <asm/prctl.h> |
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#include <asm/proto.h> |
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#include <asm/hw_breakpoint.h> |
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#include <asm/traps.h> |
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#include <asm/syscall.h> |
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#include <asm/fsgsbase.h> |
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#include <asm/io_bitmap.h> |
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|
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#include "tls.h" |
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|
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enum x86_regset { |
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REGSET_GENERAL, |
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REGSET_FP, |
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REGSET_XFP, |
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REGSET_IOPERM64 = REGSET_XFP, |
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REGSET_XSTATE, |
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REGSET_TLS, |
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REGSET_IOPERM32, |
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}; |
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|
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struct pt_regs_offset { |
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const char *name; |
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int offset; |
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}; |
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|
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#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} |
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#define REG_OFFSET_END {.name = NULL, .offset = 0} |
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|
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static const struct pt_regs_offset regoffset_table[] = { |
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#ifdef CONFIG_X86_64 |
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REG_OFFSET_NAME(r15), |
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REG_OFFSET_NAME(r14), |
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REG_OFFSET_NAME(r13), |
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REG_OFFSET_NAME(r12), |
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REG_OFFSET_NAME(r11), |
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REG_OFFSET_NAME(r10), |
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REG_OFFSET_NAME(r9), |
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REG_OFFSET_NAME(r8), |
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#endif |
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REG_OFFSET_NAME(bx), |
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REG_OFFSET_NAME(cx), |
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REG_OFFSET_NAME(dx), |
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REG_OFFSET_NAME(si), |
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REG_OFFSET_NAME(di), |
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REG_OFFSET_NAME(bp), |
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REG_OFFSET_NAME(ax), |
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#ifdef CONFIG_X86_32 |
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REG_OFFSET_NAME(ds), |
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REG_OFFSET_NAME(es), |
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REG_OFFSET_NAME(fs), |
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REG_OFFSET_NAME(gs), |
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#endif |
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REG_OFFSET_NAME(orig_ax), |
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REG_OFFSET_NAME(ip), |
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REG_OFFSET_NAME(cs), |
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REG_OFFSET_NAME(flags), |
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REG_OFFSET_NAME(sp), |
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REG_OFFSET_NAME(ss), |
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REG_OFFSET_END, |
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}; |
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|
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/** |
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* regs_query_register_offset() - query register offset from its name |
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* @name: the name of a register |
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* |
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* regs_query_register_offset() returns the offset of a register in struct |
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* pt_regs from its name. If the name is invalid, this returns -EINVAL; |
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*/ |
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int regs_query_register_offset(const char *name) |
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{ |
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const struct pt_regs_offset *roff; |
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for (roff = regoffset_table; roff->name != NULL; roff++) |
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if (!strcmp(roff->name, name)) |
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return roff->offset; |
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return -EINVAL; |
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} |
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|
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/** |
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* regs_query_register_name() - query register name from its offset |
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* @offset: the offset of a register in struct pt_regs. |
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* |
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* regs_query_register_name() returns the name of a register from its |
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* offset in struct pt_regs. If the @offset is invalid, this returns NULL; |
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*/ |
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const char *regs_query_register_name(unsigned int offset) |
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{ |
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const struct pt_regs_offset *roff; |
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for (roff = regoffset_table; roff->name != NULL; roff++) |
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if (roff->offset == offset) |
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return roff->name; |
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return NULL; |
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} |
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|
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/* |
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* does not yet catch signals sent when the child dies. |
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* in exit.c or in signal.c. |
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*/ |
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|
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/* |
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* Determines which flags the user has access to [1 = access, 0 = no access]. |
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*/ |
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#define FLAG_MASK_32 ((unsigned long) \ |
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(X86_EFLAGS_CF | X86_EFLAGS_PF | \ |
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X86_EFLAGS_AF | X86_EFLAGS_ZF | \ |
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X86_EFLAGS_SF | X86_EFLAGS_TF | \ |
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X86_EFLAGS_DF | X86_EFLAGS_OF | \ |
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X86_EFLAGS_RF | X86_EFLAGS_AC)) |
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|
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/* |
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* Determines whether a value may be installed in a segment register. |
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*/ |
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static inline bool invalid_selector(u16 value) |
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{ |
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return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL); |
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} |
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|
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#ifdef CONFIG_X86_32 |
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|
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#define FLAG_MASK FLAG_MASK_32 |
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|
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static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno) |
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{ |
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BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0); |
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return ®s->bx + (regno >> 2); |
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} |
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|
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static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
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{ |
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/* |
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* Returning the value truncates it to 16 bits. |
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*/ |
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unsigned int retval; |
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if (offset != offsetof(struct user_regs_struct, gs)) |
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retval = *pt_regs_access(task_pt_regs(task), offset); |
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else { |
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if (task == current) |
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retval = get_user_gs(task_pt_regs(task)); |
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else |
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retval = task_user_gs(task); |
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} |
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return retval; |
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} |
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|
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static int set_segment_reg(struct task_struct *task, |
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unsigned long offset, u16 value) |
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{ |
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if (WARN_ON_ONCE(task == current)) |
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return -EIO; |
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|
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/* |
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* The value argument was already truncated to 16 bits. |
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*/ |
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if (invalid_selector(value)) |
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return -EIO; |
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|
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/* |
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* For %cs and %ss we cannot permit a null selector. |
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* We can permit a bogus selector as long as it has USER_RPL. |
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* Null selectors are fine for other segment registers, but |
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* we will never get back to user mode with invalid %cs or %ss |
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* and will take the trap in iret instead. Much code relies |
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* on user_mode() to distinguish a user trap frame (which can |
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* safely use invalid selectors) from a kernel trap frame. |
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*/ |
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switch (offset) { |
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case offsetof(struct user_regs_struct, cs): |
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case offsetof(struct user_regs_struct, ss): |
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if (unlikely(value == 0)) |
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return -EIO; |
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fallthrough; |
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default: |
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*pt_regs_access(task_pt_regs(task), offset) = value; |
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break; |
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|
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case offsetof(struct user_regs_struct, gs): |
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task_user_gs(task) = value; |
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} |
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return 0; |
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} |
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|
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#else /* CONFIG_X86_64 */ |
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|
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#define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT) |
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static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset) |
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{ |
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BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0); |
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return ®s->r15 + (offset / sizeof(regs->r15)); |
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} |
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|
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static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
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{ |
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/* |
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* Returning the value truncates it to 16 bits. |
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*/ |
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unsigned int seg; |
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|
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switch (offset) { |
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case offsetof(struct user_regs_struct, fs): |
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if (task == current) { |
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/* Older gas can't assemble movq %?s,%r?? */ |
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asm("movl %%fs,%0" : "=r" (seg)); |
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return seg; |
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} |
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return task->thread.fsindex; |
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case offsetof(struct user_regs_struct, gs): |
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if (task == current) { |
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asm("movl %%gs,%0" : "=r" (seg)); |
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return seg; |
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} |
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return task->thread.gsindex; |
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case offsetof(struct user_regs_struct, ds): |
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if (task == current) { |
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asm("movl %%ds,%0" : "=r" (seg)); |
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return seg; |
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} |
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return task->thread.ds; |
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case offsetof(struct user_regs_struct, es): |
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if (task == current) { |
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asm("movl %%es,%0" : "=r" (seg)); |
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return seg; |
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} |
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return task->thread.es; |
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case offsetof(struct user_regs_struct, cs): |
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case offsetof(struct user_regs_struct, ss): |
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break; |
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} |
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return *pt_regs_access(task_pt_regs(task), offset); |
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} |
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|
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static int set_segment_reg(struct task_struct *task, |
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unsigned long offset, u16 value) |
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{ |
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if (WARN_ON_ONCE(task == current)) |
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return -EIO; |
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|
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/* |
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* The value argument was already truncated to 16 bits. |
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*/ |
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if (invalid_selector(value)) |
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return -EIO; |
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|
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/* |
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* Writes to FS and GS will change the stored selector. Whether |
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* this changes the segment base as well depends on whether |
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* FSGSBASE is enabled. |
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*/ |
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|
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switch (offset) { |
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case offsetof(struct user_regs_struct,fs): |
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task->thread.fsindex = value; |
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break; |
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case offsetof(struct user_regs_struct,gs): |
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task->thread.gsindex = value; |
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break; |
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case offsetof(struct user_regs_struct,ds): |
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task->thread.ds = value; |
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break; |
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case offsetof(struct user_regs_struct,es): |
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task->thread.es = value; |
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break; |
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|
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/* |
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* Can't actually change these in 64-bit mode. |
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*/ |
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case offsetof(struct user_regs_struct,cs): |
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if (unlikely(value == 0)) |
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return -EIO; |
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task_pt_regs(task)->cs = value; |
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break; |
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case offsetof(struct user_regs_struct,ss): |
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if (unlikely(value == 0)) |
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return -EIO; |
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task_pt_regs(task)->ss = value; |
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break; |
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} |
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|
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return 0; |
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} |
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|
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#endif /* CONFIG_X86_32 */ |
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|
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static unsigned long get_flags(struct task_struct *task) |
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{ |
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unsigned long retval = task_pt_regs(task)->flags; |
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|
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/* |
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* If the debugger set TF, hide it from the readout. |
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*/ |
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if (test_tsk_thread_flag(task, TIF_FORCED_TF)) |
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retval &= ~X86_EFLAGS_TF; |
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return retval; |
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} |
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static int set_flags(struct task_struct *task, unsigned long value) |
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{ |
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struct pt_regs *regs = task_pt_regs(task); |
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|
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/* |
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* If the user value contains TF, mark that |
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* it was not "us" (the debugger) that set it. |
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* If not, make sure it stays set if we had. |
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*/ |
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if (value & X86_EFLAGS_TF) |
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clear_tsk_thread_flag(task, TIF_FORCED_TF); |
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else if (test_tsk_thread_flag(task, TIF_FORCED_TF)) |
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value |= X86_EFLAGS_TF; |
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regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK); |
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return 0; |
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} |
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static int putreg(struct task_struct *child, |
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unsigned long offset, unsigned long value) |
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{ |
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switch (offset) { |
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case offsetof(struct user_regs_struct, cs): |
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case offsetof(struct user_regs_struct, ds): |
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case offsetof(struct user_regs_struct, es): |
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case offsetof(struct user_regs_struct, fs): |
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case offsetof(struct user_regs_struct, gs): |
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case offsetof(struct user_regs_struct, ss): |
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return set_segment_reg(child, offset, value); |
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|
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case offsetof(struct user_regs_struct, flags): |
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return set_flags(child, value); |
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|
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#ifdef CONFIG_X86_64 |
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case offsetof(struct user_regs_struct,fs_base): |
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if (value >= TASK_SIZE_MAX) |
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return -EIO; |
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x86_fsbase_write_task(child, value); |
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return 0; |
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case offsetof(struct user_regs_struct,gs_base): |
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if (value >= TASK_SIZE_MAX) |
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return -EIO; |
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x86_gsbase_write_task(child, value); |
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return 0; |
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#endif |
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} |
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|
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*pt_regs_access(task_pt_regs(child), offset) = value; |
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return 0; |
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} |
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|
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static unsigned long getreg(struct task_struct *task, unsigned long offset) |
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{ |
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switch (offset) { |
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case offsetof(struct user_regs_struct, cs): |
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case offsetof(struct user_regs_struct, ds): |
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case offsetof(struct user_regs_struct, es): |
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case offsetof(struct user_regs_struct, fs): |
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case offsetof(struct user_regs_struct, gs): |
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case offsetof(struct user_regs_struct, ss): |
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return get_segment_reg(task, offset); |
|
|
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case offsetof(struct user_regs_struct, flags): |
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return get_flags(task); |
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|
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#ifdef CONFIG_X86_64 |
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case offsetof(struct user_regs_struct, fs_base): |
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return x86_fsbase_read_task(task); |
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case offsetof(struct user_regs_struct, gs_base): |
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return x86_gsbase_read_task(task); |
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#endif |
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} |
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|
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return *pt_regs_access(task_pt_regs(task), offset); |
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} |
|
|
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static int genregs_get(struct task_struct *target, |
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const struct user_regset *regset, |
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struct membuf to) |
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{ |
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int reg; |
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|
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for (reg = 0; to.left; reg++) |
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membuf_store(&to, getreg(target, reg * sizeof(unsigned long))); |
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return 0; |
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} |
|
|
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static int genregs_set(struct task_struct *target, |
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const struct user_regset *regset, |
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unsigned int pos, unsigned int count, |
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const void *kbuf, const void __user *ubuf) |
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{ |
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int ret = 0; |
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if (kbuf) { |
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const unsigned long *k = kbuf; |
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while (count >= sizeof(*k) && !ret) { |
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ret = putreg(target, pos, *k++); |
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count -= sizeof(*k); |
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pos += sizeof(*k); |
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} |
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} else { |
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const unsigned long __user *u = ubuf; |
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while (count >= sizeof(*u) && !ret) { |
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unsigned long word; |
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ret = __get_user(word, u++); |
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if (ret) |
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break; |
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ret = putreg(target, pos, word); |
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count -= sizeof(*u); |
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pos += sizeof(*u); |
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} |
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} |
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return ret; |
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} |
|
|
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static void ptrace_triggered(struct perf_event *bp, |
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struct perf_sample_data *data, |
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struct pt_regs *regs) |
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{ |
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int i; |
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struct thread_struct *thread = &(current->thread); |
|
|
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/* |
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* Store in the virtual DR6 register the fact that the breakpoint |
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* was hit so the thread's debugger will see it. |
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*/ |
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for (i = 0; i < HBP_NUM; i++) { |
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if (thread->ptrace_bps[i] == bp) |
|
break; |
|
} |
|
|
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thread->virtual_dr6 |= (DR_TRAP0 << i); |
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} |
|
|
|
/* |
|
* Walk through every ptrace breakpoints for this thread and |
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* build the dr7 value on top of their attributes. |
|
* |
|
*/ |
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static unsigned long ptrace_get_dr7(struct perf_event *bp[]) |
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{ |
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int i; |
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int dr7 = 0; |
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struct arch_hw_breakpoint *info; |
|
|
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for (i = 0; i < HBP_NUM; i++) { |
|
if (bp[i] && !bp[i]->attr.disabled) { |
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info = counter_arch_bp(bp[i]); |
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dr7 |= encode_dr7(i, info->len, info->type); |
|
} |
|
} |
|
|
|
return dr7; |
|
} |
|
|
|
static int ptrace_fill_bp_fields(struct perf_event_attr *attr, |
|
int len, int type, bool disabled) |
|
{ |
|
int err, bp_len, bp_type; |
|
|
|
err = arch_bp_generic_fields(len, type, &bp_len, &bp_type); |
|
if (!err) { |
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attr->bp_len = bp_len; |
|
attr->bp_type = bp_type; |
|
attr->disabled = disabled; |
|
} |
|
|
|
return err; |
|
} |
|
|
|
static struct perf_event * |
|
ptrace_register_breakpoint(struct task_struct *tsk, int len, int type, |
|
unsigned long addr, bool disabled) |
|
{ |
|
struct perf_event_attr attr; |
|
int err; |
|
|
|
ptrace_breakpoint_init(&attr); |
|
attr.bp_addr = addr; |
|
|
|
err = ptrace_fill_bp_fields(&attr, len, type, disabled); |
|
if (err) |
|
return ERR_PTR(err); |
|
|
|
return register_user_hw_breakpoint(&attr, ptrace_triggered, |
|
NULL, tsk); |
|
} |
|
|
|
static int ptrace_modify_breakpoint(struct perf_event *bp, int len, int type, |
|
int disabled) |
|
{ |
|
struct perf_event_attr attr = bp->attr; |
|
int err; |
|
|
|
err = ptrace_fill_bp_fields(&attr, len, type, disabled); |
|
if (err) |
|
return err; |
|
|
|
return modify_user_hw_breakpoint(bp, &attr); |
|
} |
|
|
|
/* |
|
* Handle ptrace writes to debug register 7. |
|
*/ |
|
static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data) |
|
{ |
|
struct thread_struct *thread = &tsk->thread; |
|
unsigned long old_dr7; |
|
bool second_pass = false; |
|
int i, rc, ret = 0; |
|
|
|
data &= ~DR_CONTROL_RESERVED; |
|
old_dr7 = ptrace_get_dr7(thread->ptrace_bps); |
|
|
|
restore: |
|
rc = 0; |
|
for (i = 0; i < HBP_NUM; i++) { |
|
unsigned len, type; |
|
bool disabled = !decode_dr7(data, i, &len, &type); |
|
struct perf_event *bp = thread->ptrace_bps[i]; |
|
|
|
if (!bp) { |
|
if (disabled) |
|
continue; |
|
|
|
bp = ptrace_register_breakpoint(tsk, |
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len, type, 0, disabled); |
|
if (IS_ERR(bp)) { |
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rc = PTR_ERR(bp); |
|
break; |
|
} |
|
|
|
thread->ptrace_bps[i] = bp; |
|
continue; |
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} |
|
|
|
rc = ptrace_modify_breakpoint(bp, len, type, disabled); |
|
if (rc) |
|
break; |
|
} |
|
|
|
/* Restore if the first pass failed, second_pass shouldn't fail. */ |
|
if (rc && !WARN_ON(second_pass)) { |
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ret = rc; |
|
data = old_dr7; |
|
second_pass = true; |
|
goto restore; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* Handle PTRACE_PEEKUSR calls for the debug register area. |
|
*/ |
|
static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n) |
|
{ |
|
struct thread_struct *thread = &tsk->thread; |
|
unsigned long val = 0; |
|
|
|
if (n < HBP_NUM) { |
|
int index = array_index_nospec(n, HBP_NUM); |
|
struct perf_event *bp = thread->ptrace_bps[index]; |
|
|
|
if (bp) |
|
val = bp->hw.info.address; |
|
} else if (n == 6) { |
|
val = thread->virtual_dr6 ^ DR6_RESERVED; /* Flip back to arch polarity */ |
|
} else if (n == 7) { |
|
val = thread->ptrace_dr7; |
|
} |
|
return val; |
|
} |
|
|
|
static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr, |
|
unsigned long addr) |
|
{ |
|
struct thread_struct *t = &tsk->thread; |
|
struct perf_event *bp = t->ptrace_bps[nr]; |
|
int err = 0; |
|
|
|
if (!bp) { |
|
/* |
|
* Put stub len and type to create an inactive but correct bp. |
|
* |
|
* CHECKME: the previous code returned -EIO if the addr wasn't |
|
* a valid task virtual addr. The new one will return -EINVAL in |
|
* this case. |
|
* -EINVAL may be what we want for in-kernel breakpoints users, |
|
* but -EIO looks better for ptrace, since we refuse a register |
|
* writing for the user. And anyway this is the previous |
|
* behaviour. |
|
*/ |
|
bp = ptrace_register_breakpoint(tsk, |
|
X86_BREAKPOINT_LEN_1, X86_BREAKPOINT_WRITE, |
|
addr, true); |
|
if (IS_ERR(bp)) |
|
err = PTR_ERR(bp); |
|
else |
|
t->ptrace_bps[nr] = bp; |
|
} else { |
|
struct perf_event_attr attr = bp->attr; |
|
|
|
attr.bp_addr = addr; |
|
err = modify_user_hw_breakpoint(bp, &attr); |
|
} |
|
|
|
return err; |
|
} |
|
|
|
/* |
|
* Handle PTRACE_POKEUSR calls for the debug register area. |
|
*/ |
|
static int ptrace_set_debugreg(struct task_struct *tsk, int n, |
|
unsigned long val) |
|
{ |
|
struct thread_struct *thread = &tsk->thread; |
|
/* There are no DR4 or DR5 registers */ |
|
int rc = -EIO; |
|
|
|
if (n < HBP_NUM) { |
|
rc = ptrace_set_breakpoint_addr(tsk, n, val); |
|
} else if (n == 6) { |
|
thread->virtual_dr6 = val ^ DR6_RESERVED; /* Flip to positive polarity */ |
|
rc = 0; |
|
} else if (n == 7) { |
|
rc = ptrace_write_dr7(tsk, val); |
|
if (!rc) |
|
thread->ptrace_dr7 = val; |
|
} |
|
return rc; |
|
} |
|
|
|
/* |
|
* These access the current or another (stopped) task's io permission |
|
* bitmap for debugging or core dump. |
|
*/ |
|
static int ioperm_active(struct task_struct *target, |
|
const struct user_regset *regset) |
|
{ |
|
struct io_bitmap *iobm = target->thread.io_bitmap; |
|
|
|
return iobm ? DIV_ROUND_UP(iobm->max, regset->size) : 0; |
|
} |
|
|
|
static int ioperm_get(struct task_struct *target, |
|
const struct user_regset *regset, |
|
struct membuf to) |
|
{ |
|
struct io_bitmap *iobm = target->thread.io_bitmap; |
|
|
|
if (!iobm) |
|
return -ENXIO; |
|
|
|
return membuf_write(&to, iobm->bitmap, IO_BITMAP_BYTES); |
|
} |
|
|
|
/* |
|
* Called by kernel/ptrace.c when detaching.. |
|
* |
|
* Make sure the single step bit is not set. |
|
*/ |
|
void ptrace_disable(struct task_struct *child) |
|
{ |
|
user_disable_single_step(child); |
|
} |
|
|
|
#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
|
static const struct user_regset_view user_x86_32_view; /* Initialized below. */ |
|
#endif |
|
#ifdef CONFIG_X86_64 |
|
static const struct user_regset_view user_x86_64_view; /* Initialized below. */ |
|
#endif |
|
|
|
long arch_ptrace(struct task_struct *child, long request, |
|
unsigned long addr, unsigned long data) |
|
{ |
|
int ret; |
|
unsigned long __user *datap = (unsigned long __user *)data; |
|
|
|
#ifdef CONFIG_X86_64 |
|
/* This is native 64-bit ptrace() */ |
|
const struct user_regset_view *regset_view = &user_x86_64_view; |
|
#else |
|
/* This is native 32-bit ptrace() */ |
|
const struct user_regset_view *regset_view = &user_x86_32_view; |
|
#endif |
|
|
|
switch (request) { |
|
/* read the word at location addr in the USER area. */ |
|
case PTRACE_PEEKUSR: { |
|
unsigned long tmp; |
|
|
|
ret = -EIO; |
|
if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user)) |
|
break; |
|
|
|
tmp = 0; /* Default return condition */ |
|
if (addr < sizeof(struct user_regs_struct)) |
|
tmp = getreg(child, addr); |
|
else if (addr >= offsetof(struct user, u_debugreg[0]) && |
|
addr <= offsetof(struct user, u_debugreg[7])) { |
|
addr -= offsetof(struct user, u_debugreg[0]); |
|
tmp = ptrace_get_debugreg(child, addr / sizeof(data)); |
|
} |
|
ret = put_user(tmp, datap); |
|
break; |
|
} |
|
|
|
case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
|
ret = -EIO; |
|
if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user)) |
|
break; |
|
|
|
if (addr < sizeof(struct user_regs_struct)) |
|
ret = putreg(child, addr, data); |
|
else if (addr >= offsetof(struct user, u_debugreg[0]) && |
|
addr <= offsetof(struct user, u_debugreg[7])) { |
|
addr -= offsetof(struct user, u_debugreg[0]); |
|
ret = ptrace_set_debugreg(child, |
|
addr / sizeof(data), data); |
|
} |
|
break; |
|
|
|
case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
|
return copy_regset_to_user(child, |
|
regset_view, |
|
REGSET_GENERAL, |
|
0, sizeof(struct user_regs_struct), |
|
datap); |
|
|
|
case PTRACE_SETREGS: /* Set all gp regs in the child. */ |
|
return copy_regset_from_user(child, |
|
regset_view, |
|
REGSET_GENERAL, |
|
0, sizeof(struct user_regs_struct), |
|
datap); |
|
|
|
case PTRACE_GETFPREGS: /* Get the child FPU state. */ |
|
return copy_regset_to_user(child, |
|
regset_view, |
|
REGSET_FP, |
|
0, sizeof(struct user_i387_struct), |
|
datap); |
|
|
|
case PTRACE_SETFPREGS: /* Set the child FPU state. */ |
|
return copy_regset_from_user(child, |
|
regset_view, |
|
REGSET_FP, |
|
0, sizeof(struct user_i387_struct), |
|
datap); |
|
|
|
#ifdef CONFIG_X86_32 |
|
case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
|
return copy_regset_to_user(child, &user_x86_32_view, |
|
REGSET_XFP, |
|
0, sizeof(struct user_fxsr_struct), |
|
datap) ? -EIO : 0; |
|
|
|
case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ |
|
return copy_regset_from_user(child, &user_x86_32_view, |
|
REGSET_XFP, |
|
0, sizeof(struct user_fxsr_struct), |
|
datap) ? -EIO : 0; |
|
#endif |
|
|
|
#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
|
case PTRACE_GET_THREAD_AREA: |
|
if ((int) addr < 0) |
|
return -EIO; |
|
ret = do_get_thread_area(child, addr, |
|
(struct user_desc __user *)data); |
|
break; |
|
|
|
case PTRACE_SET_THREAD_AREA: |
|
if ((int) addr < 0) |
|
return -EIO; |
|
ret = do_set_thread_area(child, addr, |
|
(struct user_desc __user *)data, 0); |
|
break; |
|
#endif |
|
|
|
#ifdef CONFIG_X86_64 |
|
/* normal 64bit interface to access TLS data. |
|
Works just like arch_prctl, except that the arguments |
|
are reversed. */ |
|
case PTRACE_ARCH_PRCTL: |
|
ret = do_arch_prctl_64(child, data, addr); |
|
break; |
|
#endif |
|
|
|
default: |
|
ret = ptrace_request(child, request, addr, data); |
|
break; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
#ifdef CONFIG_IA32_EMULATION |
|
|
|
#include <linux/compat.h> |
|
#include <linux/syscalls.h> |
|
#include <asm/ia32.h> |
|
#include <asm/user32.h> |
|
|
|
#define R32(l,q) \ |
|
case offsetof(struct user32, regs.l): \ |
|
regs->q = value; break |
|
|
|
#define SEG32(rs) \ |
|
case offsetof(struct user32, regs.rs): \ |
|
return set_segment_reg(child, \ |
|
offsetof(struct user_regs_struct, rs), \ |
|
value); \ |
|
break |
|
|
|
static int putreg32(struct task_struct *child, unsigned regno, u32 value) |
|
{ |
|
struct pt_regs *regs = task_pt_regs(child); |
|
int ret; |
|
|
|
switch (regno) { |
|
|
|
SEG32(cs); |
|
SEG32(ds); |
|
SEG32(es); |
|
|
|
/* |
|
* A 32-bit ptracer on a 64-bit kernel expects that writing |
|
* FS or GS will also update the base. This is needed for |
|
* operations like PTRACE_SETREGS to fully restore a saved |
|
* CPU state. |
|
*/ |
|
|
|
case offsetof(struct user32, regs.fs): |
|
ret = set_segment_reg(child, |
|
offsetof(struct user_regs_struct, fs), |
|
value); |
|
if (ret == 0) |
|
child->thread.fsbase = |
|
x86_fsgsbase_read_task(child, value); |
|
return ret; |
|
|
|
case offsetof(struct user32, regs.gs): |
|
ret = set_segment_reg(child, |
|
offsetof(struct user_regs_struct, gs), |
|
value); |
|
if (ret == 0) |
|
child->thread.gsbase = |
|
x86_fsgsbase_read_task(child, value); |
|
return ret; |
|
|
|
SEG32(ss); |
|
|
|
R32(ebx, bx); |
|
R32(ecx, cx); |
|
R32(edx, dx); |
|
R32(edi, di); |
|
R32(esi, si); |
|
R32(ebp, bp); |
|
R32(eax, ax); |
|
R32(eip, ip); |
|
R32(esp, sp); |
|
|
|
case offsetof(struct user32, regs.orig_eax): |
|
/* |
|
* Warning: bizarre corner case fixup here. A 32-bit |
|
* debugger setting orig_eax to -1 wants to disable |
|
* syscall restart. Make sure that the syscall |
|
* restart code sign-extends orig_ax. Also make sure |
|
* we interpret the -ERESTART* codes correctly if |
|
* loaded into regs->ax in case the task is not |
|
* actually still sitting at the exit from a 32-bit |
|
* syscall with TS_COMPAT still set. |
|
*/ |
|
regs->orig_ax = value; |
|
if (syscall_get_nr(child, regs) >= 0) |
|
child->thread_info.status |= TS_I386_REGS_POKED; |
|
break; |
|
|
|
case offsetof(struct user32, regs.eflags): |
|
return set_flags(child, value); |
|
|
|
case offsetof(struct user32, u_debugreg[0]) ... |
|
offsetof(struct user32, u_debugreg[7]): |
|
regno -= offsetof(struct user32, u_debugreg[0]); |
|
return ptrace_set_debugreg(child, regno / 4, value); |
|
|
|
default: |
|
if (regno > sizeof(struct user32) || (regno & 3)) |
|
return -EIO; |
|
|
|
/* |
|
* Other dummy fields in the virtual user structure |
|
* are ignored |
|
*/ |
|
break; |
|
} |
|
return 0; |
|
} |
|
|
|
#undef R32 |
|
#undef SEG32 |
|
|
|
#define R32(l,q) \ |
|
case offsetof(struct user32, regs.l): \ |
|
*val = regs->q; break |
|
|
|
#define SEG32(rs) \ |
|
case offsetof(struct user32, regs.rs): \ |
|
*val = get_segment_reg(child, \ |
|
offsetof(struct user_regs_struct, rs)); \ |
|
break |
|
|
|
static int getreg32(struct task_struct *child, unsigned regno, u32 *val) |
|
{ |
|
struct pt_regs *regs = task_pt_regs(child); |
|
|
|
switch (regno) { |
|
|
|
SEG32(ds); |
|
SEG32(es); |
|
SEG32(fs); |
|
SEG32(gs); |
|
|
|
R32(cs, cs); |
|
R32(ss, ss); |
|
R32(ebx, bx); |
|
R32(ecx, cx); |
|
R32(edx, dx); |
|
R32(edi, di); |
|
R32(esi, si); |
|
R32(ebp, bp); |
|
R32(eax, ax); |
|
R32(orig_eax, orig_ax); |
|
R32(eip, ip); |
|
R32(esp, sp); |
|
|
|
case offsetof(struct user32, regs.eflags): |
|
*val = get_flags(child); |
|
break; |
|
|
|
case offsetof(struct user32, u_debugreg[0]) ... |
|
offsetof(struct user32, u_debugreg[7]): |
|
regno -= offsetof(struct user32, u_debugreg[0]); |
|
*val = ptrace_get_debugreg(child, regno / 4); |
|
break; |
|
|
|
default: |
|
if (regno > sizeof(struct user32) || (regno & 3)) |
|
return -EIO; |
|
|
|
/* |
|
* Other dummy fields in the virtual user structure |
|
* are ignored |
|
*/ |
|
*val = 0; |
|
break; |
|
} |
|
return 0; |
|
} |
|
|
|
#undef R32 |
|
#undef SEG32 |
|
|
|
static int genregs32_get(struct task_struct *target, |
|
const struct user_regset *regset, |
|
struct membuf to) |
|
{ |
|
int reg; |
|
|
|
for (reg = 0; to.left; reg++) { |
|
u32 val; |
|
getreg32(target, reg * 4, &val); |
|
membuf_store(&to, val); |
|
} |
|
return 0; |
|
} |
|
|
|
static int genregs32_set(struct task_struct *target, |
|
const struct user_regset *regset, |
|
unsigned int pos, unsigned int count, |
|
const void *kbuf, const void __user *ubuf) |
|
{ |
|
int ret = 0; |
|
if (kbuf) { |
|
const compat_ulong_t *k = kbuf; |
|
while (count >= sizeof(*k) && !ret) { |
|
ret = putreg32(target, pos, *k++); |
|
count -= sizeof(*k); |
|
pos += sizeof(*k); |
|
} |
|
} else { |
|
const compat_ulong_t __user *u = ubuf; |
|
while (count >= sizeof(*u) && !ret) { |
|
compat_ulong_t word; |
|
ret = __get_user(word, u++); |
|
if (ret) |
|
break; |
|
ret = putreg32(target, pos, word); |
|
count -= sizeof(*u); |
|
pos += sizeof(*u); |
|
} |
|
} |
|
return ret; |
|
} |
|
|
|
static long ia32_arch_ptrace(struct task_struct *child, compat_long_t request, |
|
compat_ulong_t caddr, compat_ulong_t cdata) |
|
{ |
|
unsigned long addr = caddr; |
|
unsigned long data = cdata; |
|
void __user *datap = compat_ptr(data); |
|
int ret; |
|
__u32 val; |
|
|
|
switch (request) { |
|
case PTRACE_PEEKUSR: |
|
ret = getreg32(child, addr, &val); |
|
if (ret == 0) |
|
ret = put_user(val, (__u32 __user *)datap); |
|
break; |
|
|
|
case PTRACE_POKEUSR: |
|
ret = putreg32(child, addr, data); |
|
break; |
|
|
|
case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
|
return copy_regset_to_user(child, &user_x86_32_view, |
|
REGSET_GENERAL, |
|
0, sizeof(struct user_regs_struct32), |
|
datap); |
|
|
|
case PTRACE_SETREGS: /* Set all gp regs in the child. */ |
|
return copy_regset_from_user(child, &user_x86_32_view, |
|
REGSET_GENERAL, 0, |
|
sizeof(struct user_regs_struct32), |
|
datap); |
|
|
|
case PTRACE_GETFPREGS: /* Get the child FPU state. */ |
|
return copy_regset_to_user(child, &user_x86_32_view, |
|
REGSET_FP, 0, |
|
sizeof(struct user_i387_ia32_struct), |
|
datap); |
|
|
|
case PTRACE_SETFPREGS: /* Set the child FPU state. */ |
|
return copy_regset_from_user( |
|
child, &user_x86_32_view, REGSET_FP, |
|
0, sizeof(struct user_i387_ia32_struct), datap); |
|
|
|
case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
|
return copy_regset_to_user(child, &user_x86_32_view, |
|
REGSET_XFP, 0, |
|
sizeof(struct user32_fxsr_struct), |
|
datap); |
|
|
|
case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ |
|
return copy_regset_from_user(child, &user_x86_32_view, |
|
REGSET_XFP, 0, |
|
sizeof(struct user32_fxsr_struct), |
|
datap); |
|
|
|
case PTRACE_GET_THREAD_AREA: |
|
case PTRACE_SET_THREAD_AREA: |
|
return arch_ptrace(child, request, addr, data); |
|
|
|
default: |
|
return compat_ptrace_request(child, request, addr, data); |
|
} |
|
|
|
return ret; |
|
} |
|
#endif /* CONFIG_IA32_EMULATION */ |
|
|
|
#ifdef CONFIG_X86_X32_ABI |
|
static long x32_arch_ptrace(struct task_struct *child, |
|
compat_long_t request, compat_ulong_t caddr, |
|
compat_ulong_t cdata) |
|
{ |
|
unsigned long addr = caddr; |
|
unsigned long data = cdata; |
|
void __user *datap = compat_ptr(data); |
|
int ret; |
|
|
|
switch (request) { |
|
/* Read 32bits at location addr in the USER area. Only allow |
|
to return the lower 32bits of segment and debug registers. */ |
|
case PTRACE_PEEKUSR: { |
|
u32 tmp; |
|
|
|
ret = -EIO; |
|
if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) || |
|
addr < offsetof(struct user_regs_struct, cs)) |
|
break; |
|
|
|
tmp = 0; /* Default return condition */ |
|
if (addr < sizeof(struct user_regs_struct)) |
|
tmp = getreg(child, addr); |
|
else if (addr >= offsetof(struct user, u_debugreg[0]) && |
|
addr <= offsetof(struct user, u_debugreg[7])) { |
|
addr -= offsetof(struct user, u_debugreg[0]); |
|
tmp = ptrace_get_debugreg(child, addr / sizeof(data)); |
|
} |
|
ret = put_user(tmp, (__u32 __user *)datap); |
|
break; |
|
} |
|
|
|
/* Write the word at location addr in the USER area. Only allow |
|
to update segment and debug registers with the upper 32bits |
|
zero-extended. */ |
|
case PTRACE_POKEUSR: |
|
ret = -EIO; |
|
if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) || |
|
addr < offsetof(struct user_regs_struct, cs)) |
|
break; |
|
|
|
if (addr < sizeof(struct user_regs_struct)) |
|
ret = putreg(child, addr, data); |
|
else if (addr >= offsetof(struct user, u_debugreg[0]) && |
|
addr <= offsetof(struct user, u_debugreg[7])) { |
|
addr -= offsetof(struct user, u_debugreg[0]); |
|
ret = ptrace_set_debugreg(child, |
|
addr / sizeof(data), data); |
|
} |
|
break; |
|
|
|
case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
|
return copy_regset_to_user(child, |
|
&user_x86_64_view, |
|
REGSET_GENERAL, |
|
0, sizeof(struct user_regs_struct), |
|
datap); |
|
|
|
case PTRACE_SETREGS: /* Set all gp regs in the child. */ |
|
return copy_regset_from_user(child, |
|
&user_x86_64_view, |
|
REGSET_GENERAL, |
|
0, sizeof(struct user_regs_struct), |
|
datap); |
|
|
|
case PTRACE_GETFPREGS: /* Get the child FPU state. */ |
|
return copy_regset_to_user(child, |
|
&user_x86_64_view, |
|
REGSET_FP, |
|
0, sizeof(struct user_i387_struct), |
|
datap); |
|
|
|
case PTRACE_SETFPREGS: /* Set the child FPU state. */ |
|
return copy_regset_from_user(child, |
|
&user_x86_64_view, |
|
REGSET_FP, |
|
0, sizeof(struct user_i387_struct), |
|
datap); |
|
|
|
default: |
|
return compat_ptrace_request(child, request, addr, data); |
|
} |
|
|
|
return ret; |
|
} |
|
#endif |
|
|
|
#ifdef CONFIG_COMPAT |
|
long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
|
compat_ulong_t caddr, compat_ulong_t cdata) |
|
{ |
|
#ifdef CONFIG_X86_X32_ABI |
|
if (!in_ia32_syscall()) |
|
return x32_arch_ptrace(child, request, caddr, cdata); |
|
#endif |
|
#ifdef CONFIG_IA32_EMULATION |
|
return ia32_arch_ptrace(child, request, caddr, cdata); |
|
#else |
|
return 0; |
|
#endif |
|
} |
|
#endif /* CONFIG_COMPAT */ |
|
|
|
#ifdef CONFIG_X86_64 |
|
|
|
static struct user_regset x86_64_regsets[] __ro_after_init = { |
|
[REGSET_GENERAL] = { |
|
.core_note_type = NT_PRSTATUS, |
|
.n = sizeof(struct user_regs_struct) / sizeof(long), |
|
.size = sizeof(long), .align = sizeof(long), |
|
.regset_get = genregs_get, .set = genregs_set |
|
}, |
|
[REGSET_FP] = { |
|
.core_note_type = NT_PRFPREG, |
|
.n = sizeof(struct user_i387_struct) / sizeof(long), |
|
.size = sizeof(long), .align = sizeof(long), |
|
.active = regset_xregset_fpregs_active, .regset_get = xfpregs_get, .set = xfpregs_set |
|
}, |
|
[REGSET_XSTATE] = { |
|
.core_note_type = NT_X86_XSTATE, |
|
.size = sizeof(u64), .align = sizeof(u64), |
|
.active = xstateregs_active, .regset_get = xstateregs_get, |
|
.set = xstateregs_set |
|
}, |
|
[REGSET_IOPERM64] = { |
|
.core_note_type = NT_386_IOPERM, |
|
.n = IO_BITMAP_LONGS, |
|
.size = sizeof(long), .align = sizeof(long), |
|
.active = ioperm_active, .regset_get = ioperm_get |
|
}, |
|
}; |
|
|
|
static const struct user_regset_view user_x86_64_view = { |
|
.name = "x86_64", .e_machine = EM_X86_64, |
|
.regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets) |
|
}; |
|
|
|
#else /* CONFIG_X86_32 */ |
|
|
|
#define user_regs_struct32 user_regs_struct |
|
#define genregs32_get genregs_get |
|
#define genregs32_set genregs_set |
|
|
|
#endif /* CONFIG_X86_64 */ |
|
|
|
#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
|
static struct user_regset x86_32_regsets[] __ro_after_init = { |
|
[REGSET_GENERAL] = { |
|
.core_note_type = NT_PRSTATUS, |
|
.n = sizeof(struct user_regs_struct32) / sizeof(u32), |
|
.size = sizeof(u32), .align = sizeof(u32), |
|
.regset_get = genregs32_get, .set = genregs32_set |
|
}, |
|
[REGSET_FP] = { |
|
.core_note_type = NT_PRFPREG, |
|
.n = sizeof(struct user_i387_ia32_struct) / sizeof(u32), |
|
.size = sizeof(u32), .align = sizeof(u32), |
|
.active = regset_fpregs_active, .regset_get = fpregs_get, .set = fpregs_set |
|
}, |
|
[REGSET_XFP] = { |
|
.core_note_type = NT_PRXFPREG, |
|
.n = sizeof(struct user32_fxsr_struct) / sizeof(u32), |
|
.size = sizeof(u32), .align = sizeof(u32), |
|
.active = regset_xregset_fpregs_active, .regset_get = xfpregs_get, .set = xfpregs_set |
|
}, |
|
[REGSET_XSTATE] = { |
|
.core_note_type = NT_X86_XSTATE, |
|
.size = sizeof(u64), .align = sizeof(u64), |
|
.active = xstateregs_active, .regset_get = xstateregs_get, |
|
.set = xstateregs_set |
|
}, |
|
[REGSET_TLS] = { |
|
.core_note_type = NT_386_TLS, |
|
.n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN, |
|
.size = sizeof(struct user_desc), |
|
.align = sizeof(struct user_desc), |
|
.active = regset_tls_active, |
|
.regset_get = regset_tls_get, .set = regset_tls_set |
|
}, |
|
[REGSET_IOPERM32] = { |
|
.core_note_type = NT_386_IOPERM, |
|
.n = IO_BITMAP_BYTES / sizeof(u32), |
|
.size = sizeof(u32), .align = sizeof(u32), |
|
.active = ioperm_active, .regset_get = ioperm_get |
|
}, |
|
}; |
|
|
|
static const struct user_regset_view user_x86_32_view = { |
|
.name = "i386", .e_machine = EM_386, |
|
.regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets) |
|
}; |
|
#endif |
|
|
|
/* |
|
* This represents bytes 464..511 in the memory layout exported through |
|
* the REGSET_XSTATE interface. |
|
*/ |
|
u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS]; |
|
|
|
void __init update_regset_xstate_info(unsigned int size, u64 xstate_mask) |
|
{ |
|
#ifdef CONFIG_X86_64 |
|
x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64); |
|
#endif |
|
#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
|
x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64); |
|
#endif |
|
xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask; |
|
} |
|
|
|
/* |
|
* This is used by the core dump code to decide which regset to dump. The |
|
* core dump code writes out the resulting .e_machine and the corresponding |
|
* regsets. This is suboptimal if the task is messing around with its CS.L |
|
* field, but at worst the core dump will end up missing some information. |
|
* |
|
* Unfortunately, it is also used by the broken PTRACE_GETREGSET and |
|
* PTRACE_SETREGSET APIs. These APIs look at the .regsets field but have |
|
* no way to make sure that the e_machine they use matches the caller's |
|
* expectations. The result is that the data format returned by |
|
* PTRACE_GETREGSET depends on the returned CS field (and even the offset |
|
* of the returned CS field depends on its value!) and the data format |
|
* accepted by PTRACE_SETREGSET is determined by the old CS value. The |
|
* upshot is that it is basically impossible to use these APIs correctly. |
|
* |
|
* The best way to fix it in the long run would probably be to add new |
|
* improved ptrace() APIs to read and write registers reliably, possibly by |
|
* allowing userspace to select the ELF e_machine variant that they expect. |
|
*/ |
|
const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
|
{ |
|
#ifdef CONFIG_IA32_EMULATION |
|
if (!user_64bit_mode(task_pt_regs(task))) |
|
#endif |
|
#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
|
return &user_x86_32_view; |
|
#endif |
|
#ifdef CONFIG_X86_64 |
|
return &user_x86_64_view; |
|
#endif |
|
} |
|
|
|
void send_sigtrap(struct pt_regs *regs, int error_code, int si_code) |
|
{ |
|
struct task_struct *tsk = current; |
|
|
|
tsk->thread.trap_nr = X86_TRAP_DB; |
|
tsk->thread.error_code = error_code; |
|
|
|
/* Send us the fake SIGTRAP */ |
|
force_sig_fault(SIGTRAP, si_code, |
|
user_mode(regs) ? (void __user *)regs->ip : NULL); |
|
} |
|
|
|
void user_single_step_report(struct pt_regs *regs) |
|
{ |
|
send_sigtrap(regs, 0, TRAP_BRKPT); |
|
}
|
|
|