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175 lines
6.6 KiB
175 lines
6.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/compat.h> |
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#include <linux/uaccess.h> |
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#include <linux/ptrace.h> |
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/* |
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* The compat_siginfo_t structure and handing code is very easy |
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* to break in several ways. It must always be updated when new |
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* updates are made to the main siginfo_t, and |
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* copy_siginfo_to_user32() must be updated when the |
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* (arch-independent) copy_siginfo_to_user() is updated. |
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* |
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* It is also easy to put a new member in the compat_siginfo_t |
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* which has implicit alignment which can move internal structure |
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* alignment around breaking the ABI. This can happen if you, |
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* for instance, put a plain 64-bit value in there. |
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*/ |
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static inline void signal_compat_build_tests(void) |
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{ |
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int _sifields_offset = offsetof(compat_siginfo_t, _sifields); |
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/* |
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* If adding a new si_code, there is probably new data in |
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* the siginfo. Make sure folks bumping the si_code |
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* limits also have to look at this code. Make sure any |
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* new fields are handled in copy_siginfo_to_user32()! |
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*/ |
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BUILD_BUG_ON(NSIGILL != 11); |
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BUILD_BUG_ON(NSIGFPE != 15); |
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BUILD_BUG_ON(NSIGSEGV != 9); |
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BUILD_BUG_ON(NSIGBUS != 5); |
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BUILD_BUG_ON(NSIGTRAP != 5); |
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BUILD_BUG_ON(NSIGCHLD != 6); |
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BUILD_BUG_ON(NSIGSYS != 2); |
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/* This is part of the ABI and can never change in size: */ |
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BUILD_BUG_ON(sizeof(compat_siginfo_t) != 128); |
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/* |
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* The offsets of all the (unioned) si_fields are fixed |
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* in the ABI, of course. Make sure none of them ever |
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* move and are always at the beginning: |
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*/ |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, _sifields) != 3 * sizeof(int)); |
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#define CHECK_CSI_OFFSET(name) BUILD_BUG_ON(_sifields_offset != offsetof(compat_siginfo_t, _sifields.name)) |
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BUILD_BUG_ON(offsetof(siginfo_t, si_signo) != 0); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_errno) != 4); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_code) != 8); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_signo) != 0); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_errno) != 4); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_code) != 8); |
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/* |
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* Ensure that the size of each si_field never changes. |
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* If it does, it is a sign that the |
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* copy_siginfo_to_user32() code below needs to updated |
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* along with the size in the CHECK_SI_SIZE(). |
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* |
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* We repeat this check for both the generic and compat |
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* siginfos. |
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* |
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* Note: it is OK for these to grow as long as the whole |
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* structure stays within the padding size (checked |
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* above). |
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*/ |
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#define CHECK_CSI_SIZE(name, size) BUILD_BUG_ON(size != sizeof(((compat_siginfo_t *)0)->_sifields.name)) |
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#define CHECK_SI_SIZE(name, size) BUILD_BUG_ON(size != sizeof(((siginfo_t *)0)->_sifields.name)) |
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CHECK_CSI_OFFSET(_kill); |
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CHECK_CSI_SIZE (_kill, 2*sizeof(int)); |
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CHECK_SI_SIZE (_kill, 2*sizeof(int)); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x10); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x14); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_pid) != 0xC); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_uid) != 0x10); |
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CHECK_CSI_OFFSET(_timer); |
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CHECK_CSI_SIZE (_timer, 3*sizeof(int)); |
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CHECK_SI_SIZE (_timer, 6*sizeof(int)); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_tid) != 0x10); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_overrun) != 0x14); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x18); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_tid) != 0x0C); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_overrun) != 0x10); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_value) != 0x14); |
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CHECK_CSI_OFFSET(_rt); |
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CHECK_CSI_SIZE (_rt, 3*sizeof(int)); |
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CHECK_SI_SIZE (_rt, 4*sizeof(int)); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x10); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x14); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x18); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_pid) != 0x0C); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_uid) != 0x10); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_value) != 0x14); |
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CHECK_CSI_OFFSET(_sigchld); |
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CHECK_CSI_SIZE (_sigchld, 5*sizeof(int)); |
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CHECK_SI_SIZE (_sigchld, 8*sizeof(int)); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x10); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x14); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_status) != 0x18); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_utime) != 0x20); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_stime) != 0x28); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_pid) != 0x0C); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_uid) != 0x10); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_status) != 0x14); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_utime) != 0x18); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_stime) != 0x1C); |
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#ifdef CONFIG_X86_X32_ABI |
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CHECK_CSI_OFFSET(_sigchld_x32); |
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CHECK_CSI_SIZE (_sigchld_x32, 7*sizeof(int)); |
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/* no _sigchld_x32 in the generic siginfo_t */ |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, _sifields._sigchld_x32._utime) != 0x18); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, _sifields._sigchld_x32._stime) != 0x20); |
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#endif |
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CHECK_CSI_OFFSET(_sigfault); |
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CHECK_CSI_SIZE (_sigfault, 4*sizeof(int)); |
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CHECK_SI_SIZE (_sigfault, 8*sizeof(int)); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_addr) != 0x10); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_addr) != 0x0C); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_addr_lsb) != 0x18); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_addr_lsb) != 0x10); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_lower) != 0x20); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_upper) != 0x28); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_lower) != 0x14); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_upper) != 0x18); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_pkey) != 0x20); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_pkey) != 0x14); |
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CHECK_CSI_OFFSET(_sigpoll); |
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CHECK_CSI_SIZE (_sigpoll, 2*sizeof(int)); |
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CHECK_SI_SIZE (_sigpoll, 4*sizeof(int)); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_band) != 0x10); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_fd) != 0x18); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_band) != 0x0C); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_fd) != 0x10); |
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CHECK_CSI_OFFSET(_sigsys); |
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CHECK_CSI_SIZE (_sigsys, 3*sizeof(int)); |
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CHECK_SI_SIZE (_sigsys, 4*sizeof(int)); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_call_addr) != 0x10); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_syscall) != 0x18); |
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BUILD_BUG_ON(offsetof(siginfo_t, si_arch) != 0x1C); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_call_addr) != 0x0C); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_syscall) != 0x10); |
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_arch) != 0x14); |
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/* any new si_fields should be added here */ |
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} |
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void sigaction_compat_abi(struct k_sigaction *act, struct k_sigaction *oact) |
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{ |
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signal_compat_build_tests(); |
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if (!act) |
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return; |
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if (in_ia32_syscall()) |
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act->sa.sa_flags |= SA_IA32_ABI; |
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if (in_x32_syscall()) |
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act->sa.sa_flags |= SA_X32_ABI; |
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}
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