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209 lines
5.1 KiB
209 lines
5.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
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*/ |
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#include <stddef.h> |
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#include <unistd.h> |
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#include <errno.h> |
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#include <string.h> |
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#include <sys/mman.h> |
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#include <init.h> |
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#include <as-layout.h> |
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#include <mm_id.h> |
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#include <os.h> |
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#include <ptrace_user.h> |
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#include <registers.h> |
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#include <skas.h> |
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#include <sysdep/ptrace.h> |
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#include <sysdep/stub.h> |
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extern char batch_syscall_stub[], __syscall_stub_start[]; |
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extern void wait_stub_done(int pid); |
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static inline unsigned long *check_init_stack(struct mm_id * mm_idp, |
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unsigned long *stack) |
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{ |
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if (stack == NULL) { |
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stack = (unsigned long *) mm_idp->stack + 2; |
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*stack = 0; |
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} |
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return stack; |
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} |
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static unsigned long syscall_regs[MAX_REG_NR]; |
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static int __init init_syscall_regs(void) |
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{ |
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get_safe_registers(syscall_regs, NULL); |
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syscall_regs[REGS_IP_INDEX] = STUB_CODE + |
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((unsigned long) batch_syscall_stub - |
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(unsigned long) __syscall_stub_start); |
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syscall_regs[REGS_SP_INDEX] = STUB_DATA; |
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return 0; |
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} |
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__initcall(init_syscall_regs); |
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static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr) |
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{ |
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int n, i; |
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long ret, offset; |
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unsigned long * data; |
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unsigned long * syscall; |
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int err, pid = mm_idp->u.pid; |
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n = ptrace_setregs(pid, syscall_regs); |
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if (n < 0) { |
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printk(UM_KERN_ERR "Registers - \n"); |
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for (i = 0; i < MAX_REG_NR; i++) |
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printk(UM_KERN_ERR "\t%d\t0x%lx\n", i, syscall_regs[i]); |
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panic("do_syscall_stub : PTRACE_SETREGS failed, errno = %d\n", |
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-n); |
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} |
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err = ptrace(PTRACE_CONT, pid, 0, 0); |
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if (err) |
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panic("Failed to continue stub, pid = %d, errno = %d\n", pid, |
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errno); |
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wait_stub_done(pid); |
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/* |
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* When the stub stops, we find the following values on the |
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* beginning of the stack: |
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* (long )return_value |
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* (long )offset to failed sycall-data (0, if no error) |
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*/ |
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ret = *((unsigned long *) mm_idp->stack); |
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offset = *((unsigned long *) mm_idp->stack + 1); |
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if (offset) { |
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data = (unsigned long *)(mm_idp->stack + offset - STUB_DATA); |
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printk(UM_KERN_ERR "do_syscall_stub : ret = %ld, offset = %ld, " |
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"data = %p\n", ret, offset, data); |
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syscall = (unsigned long *)((unsigned long)data + data[0]); |
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printk(UM_KERN_ERR "do_syscall_stub: syscall %ld failed, " |
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"return value = 0x%lx, expected return value = 0x%lx\n", |
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syscall[0], ret, syscall[7]); |
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printk(UM_KERN_ERR " syscall parameters: " |
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"0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", |
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syscall[1], syscall[2], syscall[3], |
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syscall[4], syscall[5], syscall[6]); |
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for (n = 1; n < data[0]/sizeof(long); n++) { |
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if (n == 1) |
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printk(UM_KERN_ERR " additional syscall " |
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"data:"); |
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if (n % 4 == 1) |
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printk("\n" UM_KERN_ERR " "); |
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printk(" 0x%lx", data[n]); |
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} |
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if (n > 1) |
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printk("\n"); |
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} |
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else ret = 0; |
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*addr = check_init_stack(mm_idp, NULL); |
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return ret; |
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} |
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long run_syscall_stub(struct mm_id * mm_idp, int syscall, |
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unsigned long *args, long expected, void **addr, |
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int done) |
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{ |
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unsigned long *stack = check_init_stack(mm_idp, *addr); |
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*stack += sizeof(long); |
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stack += *stack / sizeof(long); |
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*stack++ = syscall; |
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*stack++ = args[0]; |
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*stack++ = args[1]; |
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*stack++ = args[2]; |
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*stack++ = args[3]; |
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*stack++ = args[4]; |
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*stack++ = args[5]; |
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*stack++ = expected; |
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*stack = 0; |
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if (!done && ((((unsigned long) stack) & ~UM_KERN_PAGE_MASK) < |
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UM_KERN_PAGE_SIZE - 10 * sizeof(long))) { |
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*addr = stack; |
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return 0; |
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} |
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return do_syscall_stub(mm_idp, addr); |
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} |
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long syscall_stub_data(struct mm_id * mm_idp, |
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unsigned long *data, int data_count, |
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void **addr, void **stub_addr) |
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{ |
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unsigned long *stack; |
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int ret = 0; |
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/* |
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* If *addr still is uninitialized, it *must* contain NULL. |
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* Thus in this case do_syscall_stub correctly won't be called. |
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*/ |
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if ((((unsigned long) *addr) & ~UM_KERN_PAGE_MASK) >= |
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UM_KERN_PAGE_SIZE - (10 + data_count) * sizeof(long)) { |
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ret = do_syscall_stub(mm_idp, addr); |
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/* in case of error, don't overwrite data on stack */ |
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if (ret) |
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return ret; |
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} |
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stack = check_init_stack(mm_idp, *addr); |
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*addr = stack; |
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*stack = data_count * sizeof(long); |
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memcpy(stack + 1, data, data_count * sizeof(long)); |
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*stub_addr = (void *)(((unsigned long)(stack + 1) & |
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~UM_KERN_PAGE_MASK) + STUB_DATA); |
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return 0; |
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} |
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int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len, int prot, |
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int phys_fd, unsigned long long offset, int done, void **data) |
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{ |
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int ret; |
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unsigned long args[] = { virt, len, prot, |
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MAP_SHARED | MAP_FIXED, phys_fd, |
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MMAP_OFFSET(offset) }; |
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ret = run_syscall_stub(mm_idp, STUB_MMAP_NR, args, virt, |
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data, done); |
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return ret; |
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} |
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int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len, |
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int done, void **data) |
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{ |
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int ret; |
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unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0, |
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0 }; |
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ret = run_syscall_stub(mm_idp, __NR_munmap, args, 0, |
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data, done); |
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return ret; |
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} |
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int protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len, |
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unsigned int prot, int done, void **data) |
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{ |
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int ret; |
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unsigned long args[] = { addr, len, prot, 0, 0, 0 }; |
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ret = run_syscall_stub(mm_idp, __NR_mprotect, args, 0, |
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data, done); |
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return ret; |
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}
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