192 lines
7.3 KiB
C
192 lines
7.3 KiB
C
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// 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 != 6);
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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(siginfo_t) != 128);
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BUILD_BUG_ON(sizeof(compat_siginfo_t) != 128);
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/* This is a part of the ABI and can never change in alignment */
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BUILD_BUG_ON(__alignof__(siginfo_t) != 8);
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BUILD_BUG_ON(__alignof__(compat_siginfo_t) != 4);
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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_trapno) != 0x18);
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_trapno) != 0x10);
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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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BUILD_BUG_ON(offsetof(siginfo_t, si_perf_data) != 0x18);
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BUILD_BUG_ON(offsetof(siginfo_t, si_perf_type) != 0x20);
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BUILD_BUG_ON(offsetof(siginfo_t, si_perf_flags) != 0x24);
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_perf_data) != 0x10);
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_perf_type) != 0x14);
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BUILD_BUG_ON(offsetof(compat_siginfo_t, si_perf_flags) != 0x18);
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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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