508 lines
14 KiB
C
508 lines
14 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
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* 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
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* 2000-12-* x86-64 compatibility mode signal handling by Andi Kleen
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*/
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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/kernel.h>
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#include <linux/errno.h>
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#include <linux/wait.h>
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#include <linux/unistd.h>
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#include <linux/stddef.h>
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#include <linux/personality.h>
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#include <linux/compat.h>
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#include <linux/binfmts.h>
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#include <linux/syscalls.h>
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#include <asm/ucontext.h>
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#include <linux/uaccess.h>
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#include <asm/fpu/signal.h>
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#include <asm/ptrace.h>
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#include <asm/user32.h>
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#include <uapi/asm/sigcontext.h>
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#include <asm/proto.h>
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#include <asm/vdso.h>
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#include <asm/sigframe.h>
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#include <asm/sighandling.h>
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#include <asm/smap.h>
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#include <asm/gsseg.h>
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#ifdef CONFIG_IA32_EMULATION
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#include <asm/ia32_unistd.h>
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static inline void reload_segments(struct sigcontext_32 *sc)
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{
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unsigned int cur;
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savesegment(gs, cur);
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if ((sc->gs | 0x03) != cur)
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load_gs_index(sc->gs | 0x03);
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savesegment(fs, cur);
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if ((sc->fs | 0x03) != cur)
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loadsegment(fs, sc->fs | 0x03);
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savesegment(ds, cur);
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if ((sc->ds | 0x03) != cur)
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loadsegment(ds, sc->ds | 0x03);
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savesegment(es, cur);
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if ((sc->es | 0x03) != cur)
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loadsegment(es, sc->es | 0x03);
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}
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#define sigset32_t compat_sigset_t
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#define siginfo32_t compat_siginfo_t
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#define restore_altstack32 compat_restore_altstack
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#define unsafe_save_altstack32 unsafe_compat_save_altstack
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#else
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#define sigset32_t sigset_t
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#define siginfo32_t siginfo_t
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#define __NR_ia32_sigreturn __NR_sigreturn
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#define __NR_ia32_rt_sigreturn __NR_rt_sigreturn
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#define restore_altstack32 restore_altstack
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#define unsafe_save_altstack32 unsafe_save_altstack
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#define __copy_siginfo_to_user32 copy_siginfo_to_user
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#endif
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/*
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* Do a signal return; undo the signal stack.
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*/
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static bool ia32_restore_sigcontext(struct pt_regs *regs,
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struct sigcontext_32 __user *usc)
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{
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struct sigcontext_32 sc;
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/* Always make any pending restarted system calls return -EINTR */
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current->restart_block.fn = do_no_restart_syscall;
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if (unlikely(copy_from_user(&sc, usc, sizeof(sc))))
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return false;
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/* Get only the ia32 registers. */
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regs->bx = sc.bx;
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regs->cx = sc.cx;
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regs->dx = sc.dx;
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regs->si = sc.si;
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regs->di = sc.di;
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regs->bp = sc.bp;
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regs->ax = sc.ax;
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regs->sp = sc.sp;
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regs->ip = sc.ip;
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/* Get CS/SS and force CPL3 */
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regs->cs = sc.cs | 0x03;
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regs->ss = sc.ss | 0x03;
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regs->flags = (regs->flags & ~FIX_EFLAGS) | (sc.flags & FIX_EFLAGS);
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/* disable syscall checks */
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regs->orig_ax = -1;
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#ifdef CONFIG_IA32_EMULATION
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/*
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* Reload fs and gs if they have changed in the signal
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* handler. This does not handle long fs/gs base changes in
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* the handler, but does not clobber them at least in the
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* normal case.
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*/
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reload_segments(&sc);
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#else
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loadsegment(gs, sc.gs);
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regs->fs = sc.fs;
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regs->es = sc.es;
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regs->ds = sc.ds;
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#endif
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return fpu__restore_sig(compat_ptr(sc.fpstate), 1);
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}
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SYSCALL32_DEFINE0(sigreturn)
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{
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struct pt_regs *regs = current_pt_regs();
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struct sigframe_ia32 __user *frame = (struct sigframe_ia32 __user *)(regs->sp-8);
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sigset_t set;
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if (!access_ok(frame, sizeof(*frame)))
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goto badframe;
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if (__get_user(set.sig[0], &frame->sc.oldmask)
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|| __get_user(((__u32 *)&set)[1], &frame->extramask[0]))
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goto badframe;
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set_current_blocked(&set);
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if (!ia32_restore_sigcontext(regs, &frame->sc))
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goto badframe;
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return regs->ax;
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badframe:
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signal_fault(regs, frame, "32bit sigreturn");
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return 0;
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}
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SYSCALL32_DEFINE0(rt_sigreturn)
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{
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struct pt_regs *regs = current_pt_regs();
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struct rt_sigframe_ia32 __user *frame;
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sigset_t set;
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frame = (struct rt_sigframe_ia32 __user *)(regs->sp - 4);
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if (!access_ok(frame, sizeof(*frame)))
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goto badframe;
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if (__get_user(*(__u64 *)&set, (__u64 __user *)&frame->uc.uc_sigmask))
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goto badframe;
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set_current_blocked(&set);
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if (!ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext))
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goto badframe;
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if (restore_altstack32(&frame->uc.uc_stack))
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goto badframe;
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return regs->ax;
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badframe:
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signal_fault(regs, frame, "32bit rt sigreturn");
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return 0;
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}
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/*
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* Set up a signal frame.
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*/
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#define get_user_seg(seg) ({ unsigned int v; savesegment(seg, v); v; })
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static __always_inline int
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__unsafe_setup_sigcontext32(struct sigcontext_32 __user *sc,
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void __user *fpstate,
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struct pt_regs *regs, unsigned int mask)
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{
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unsafe_put_user(get_user_seg(gs), (unsigned int __user *)&sc->gs, Efault);
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#ifdef CONFIG_IA32_EMULATION
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unsafe_put_user(get_user_seg(fs), (unsigned int __user *)&sc->fs, Efault);
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unsafe_put_user(get_user_seg(ds), (unsigned int __user *)&sc->ds, Efault);
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unsafe_put_user(get_user_seg(es), (unsigned int __user *)&sc->es, Efault);
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#else
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unsafe_put_user(regs->fs, (unsigned int __user *)&sc->fs, Efault);
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unsafe_put_user(regs->es, (unsigned int __user *)&sc->es, Efault);
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unsafe_put_user(regs->ds, (unsigned int __user *)&sc->ds, Efault);
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#endif
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unsafe_put_user(regs->di, &sc->di, Efault);
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unsafe_put_user(regs->si, &sc->si, Efault);
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unsafe_put_user(regs->bp, &sc->bp, Efault);
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unsafe_put_user(regs->sp, &sc->sp, Efault);
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unsafe_put_user(regs->bx, &sc->bx, Efault);
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unsafe_put_user(regs->dx, &sc->dx, Efault);
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unsafe_put_user(regs->cx, &sc->cx, Efault);
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unsafe_put_user(regs->ax, &sc->ax, Efault);
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unsafe_put_user(current->thread.trap_nr, &sc->trapno, Efault);
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unsafe_put_user(current->thread.error_code, &sc->err, Efault);
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unsafe_put_user(regs->ip, &sc->ip, Efault);
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unsafe_put_user(regs->cs, (unsigned int __user *)&sc->cs, Efault);
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unsafe_put_user(regs->flags, &sc->flags, Efault);
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unsafe_put_user(regs->sp, &sc->sp_at_signal, Efault);
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unsafe_put_user(regs->ss, (unsigned int __user *)&sc->ss, Efault);
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unsafe_put_user(ptr_to_compat(fpstate), &sc->fpstate, Efault);
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/* non-iBCS2 extensions.. */
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unsafe_put_user(mask, &sc->oldmask, Efault);
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unsafe_put_user(current->thread.cr2, &sc->cr2, Efault);
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return 0;
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Efault:
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return -EFAULT;
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}
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#define unsafe_put_sigcontext32(sc, fp, regs, set, label) \
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do { \
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if (__unsafe_setup_sigcontext32(sc, fp, regs, set->sig[0])) \
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goto label; \
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} while(0)
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int ia32_setup_frame(struct ksignal *ksig, struct pt_regs *regs)
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{
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sigset32_t *set = (sigset32_t *) sigmask_to_save();
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struct sigframe_ia32 __user *frame;
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void __user *restorer;
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void __user *fp = NULL;
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/* copy_to_user optimizes that into a single 8 byte store */
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static const struct {
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u16 poplmovl;
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u32 val;
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u16 int80;
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} __attribute__((packed)) code = {
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0xb858, /* popl %eax ; movl $...,%eax */
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__NR_ia32_sigreturn,
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0x80cd, /* int $0x80 */
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};
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frame = get_sigframe(ksig, regs, sizeof(*frame), &fp);
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if (ksig->ka.sa.sa_flags & SA_RESTORER) {
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restorer = ksig->ka.sa.sa_restorer;
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} else {
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/* Return stub is in 32bit vsyscall page */
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if (current->mm->context.vdso)
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restorer = current->mm->context.vdso +
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vdso_image_32.sym___kernel_sigreturn;
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else
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restorer = &frame->retcode;
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}
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if (!user_access_begin(frame, sizeof(*frame)))
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return -EFAULT;
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unsafe_put_user(ksig->sig, &frame->sig, Efault);
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unsafe_put_sigcontext32(&frame->sc, fp, regs, set, Efault);
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unsafe_put_user(set->sig[1], &frame->extramask[0], Efault);
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unsafe_put_user(ptr_to_compat(restorer), &frame->pretcode, Efault);
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/*
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* These are actually not used anymore, but left because some
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* gdb versions depend on them as a marker.
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*/
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unsafe_put_user(*((u64 *)&code), (u64 __user *)frame->retcode, Efault);
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user_access_end();
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/* Set up registers for signal handler */
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regs->sp = (unsigned long) frame;
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regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
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/* Make -mregparm=3 work */
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regs->ax = ksig->sig;
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regs->dx = 0;
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regs->cx = 0;
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#ifdef CONFIG_IA32_EMULATION
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loadsegment(ds, __USER_DS);
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loadsegment(es, __USER_DS);
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#else
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regs->ds = __USER_DS;
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regs->es = __USER_DS;
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#endif
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regs->cs = __USER32_CS;
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regs->ss = __USER_DS;
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return 0;
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Efault:
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user_access_end();
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return -EFAULT;
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}
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int ia32_setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
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{
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sigset32_t *set = (sigset32_t *) sigmask_to_save();
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struct rt_sigframe_ia32 __user *frame;
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void __user *restorer;
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void __user *fp = NULL;
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/* unsafe_put_user optimizes that into a single 8 byte store */
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static const struct {
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u8 movl;
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u32 val;
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u16 int80;
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u8 pad;
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} __attribute__((packed)) code = {
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0xb8,
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__NR_ia32_rt_sigreturn,
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0x80cd,
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0,
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};
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frame = get_sigframe(ksig, regs, sizeof(*frame), &fp);
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if (!user_access_begin(frame, sizeof(*frame)))
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return -EFAULT;
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unsafe_put_user(ksig->sig, &frame->sig, Efault);
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unsafe_put_user(ptr_to_compat(&frame->info), &frame->pinfo, Efault);
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unsafe_put_user(ptr_to_compat(&frame->uc), &frame->puc, Efault);
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/* Create the ucontext. */
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if (static_cpu_has(X86_FEATURE_XSAVE))
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unsafe_put_user(UC_FP_XSTATE, &frame->uc.uc_flags, Efault);
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else
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unsafe_put_user(0, &frame->uc.uc_flags, Efault);
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unsafe_put_user(0, &frame->uc.uc_link, Efault);
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unsafe_save_altstack32(&frame->uc.uc_stack, regs->sp, Efault);
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if (ksig->ka.sa.sa_flags & SA_RESTORER)
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restorer = ksig->ka.sa.sa_restorer;
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else
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restorer = current->mm->context.vdso +
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vdso_image_32.sym___kernel_rt_sigreturn;
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unsafe_put_user(ptr_to_compat(restorer), &frame->pretcode, Efault);
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/*
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* Not actually used anymore, but left because some gdb
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* versions need it.
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*/
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unsafe_put_user(*((u64 *)&code), (u64 __user *)frame->retcode, Efault);
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unsafe_put_sigcontext32(&frame->uc.uc_mcontext, fp, regs, set, Efault);
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unsafe_put_user(*(__u64 *)set, (__u64 __user *)&frame->uc.uc_sigmask, Efault);
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user_access_end();
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||
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|
|
||
|
|
if (__copy_siginfo_to_user32(&frame->info, &ksig->info))
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
/* Set up registers for signal handler */
|
||
|
|
regs->sp = (unsigned long) frame;
|
||
|
|
regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
|
||
|
|
|
||
|
|
/* Make -mregparm=3 work */
|
||
|
|
regs->ax = ksig->sig;
|
||
|
|
regs->dx = (unsigned long) &frame->info;
|
||
|
|
regs->cx = (unsigned long) &frame->uc;
|
||
|
|
|
||
|
|
#ifdef CONFIG_IA32_EMULATION
|
||
|
|
loadsegment(ds, __USER_DS);
|
||
|
|
loadsegment(es, __USER_DS);
|
||
|
|
#else
|
||
|
|
regs->ds = __USER_DS;
|
||
|
|
regs->es = __USER_DS;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
regs->cs = __USER32_CS;
|
||
|
|
regs->ss = __USER_DS;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
Efault:
|
||
|
|
user_access_end();
|
||
|
|
return -EFAULT;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The siginfo_t structure and handing code is very easy
|
||
|
|
* to break in several ways. It must always be updated when new
|
||
|
|
* updates are made to the main siginfo_t, and
|
||
|
|
* copy_siginfo_to_user32() must be updated when the
|
||
|
|
* (arch-independent) copy_siginfo_to_user() is updated.
|
||
|
|
*
|
||
|
|
* It is also easy to put a new member in the siginfo_t
|
||
|
|
* which has implicit alignment which can move internal structure
|
||
|
|
* alignment around breaking the ABI. This can happen if you,
|
||
|
|
* for instance, put a plain 64-bit value in there.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If adding a new si_code, there is probably new data in
|
||
|
|
* the siginfo. Make sure folks bumping the si_code
|
||
|
|
* limits also have to look at this code. Make sure any
|
||
|
|
* new fields are handled in copy_siginfo_to_user32()!
|
||
|
|
*/
|
||
|
|
static_assert(NSIGILL == 11);
|
||
|
|
static_assert(NSIGFPE == 15);
|
||
|
|
static_assert(NSIGSEGV == 9);
|
||
|
|
static_assert(NSIGBUS == 5);
|
||
|
|
static_assert(NSIGTRAP == 6);
|
||
|
|
static_assert(NSIGCHLD == 6);
|
||
|
|
static_assert(NSIGSYS == 2);
|
||
|
|
|
||
|
|
/* This is part of the ABI and can never change in size: */
|
||
|
|
static_assert(sizeof(siginfo32_t) == 128);
|
||
|
|
|
||
|
|
/* This is a part of the ABI and can never change in alignment */
|
||
|
|
static_assert(__alignof__(siginfo32_t) == 4);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The offsets of all the (unioned) si_fields are fixed
|
||
|
|
* in the ABI, of course. Make sure none of them ever
|
||
|
|
* move and are always at the beginning:
|
||
|
|
*/
|
||
|
|
static_assert(offsetof(siginfo32_t, _sifields) == 3 * sizeof(int));
|
||
|
|
|
||
|
|
static_assert(offsetof(siginfo32_t, si_signo) == 0);
|
||
|
|
static_assert(offsetof(siginfo32_t, si_errno) == 4);
|
||
|
|
static_assert(offsetof(siginfo32_t, si_code) == 8);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Ensure that the size of each si_field never changes.
|
||
|
|
* If it does, it is a sign that the
|
||
|
|
* copy_siginfo_to_user32() code below needs to updated
|
||
|
|
* along with the size in the CHECK_SI_SIZE().
|
||
|
|
*
|
||
|
|
* We repeat this check for both the generic and compat
|
||
|
|
* siginfos.
|
||
|
|
*
|
||
|
|
* Note: it is OK for these to grow as long as the whole
|
||
|
|
* structure stays within the padding size (checked
|
||
|
|
* above).
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define CHECK_SI_OFFSET(name) \
|
||
|
|
static_assert(offsetof(siginfo32_t, _sifields) == \
|
||
|
|
offsetof(siginfo32_t, _sifields.name))
|
||
|
|
|
||
|
|
#define CHECK_SI_SIZE(name, size) \
|
||
|
|
static_assert(sizeof_field(siginfo32_t, _sifields.name) == size)
|
||
|
|
|
||
|
|
CHECK_SI_OFFSET(_kill);
|
||
|
|
CHECK_SI_SIZE (_kill, 2*sizeof(int));
|
||
|
|
static_assert(offsetof(siginfo32_t, si_pid) == 0xC);
|
||
|
|
static_assert(offsetof(siginfo32_t, si_uid) == 0x10);
|
||
|
|
|
||
|
|
CHECK_SI_OFFSET(_timer);
|
||
|
|
#ifdef CONFIG_COMPAT
|
||
|
|
/* compat_siginfo_t doesn't have si_sys_private */
|
||
|
|
CHECK_SI_SIZE (_timer, 3*sizeof(int));
|
||
|
|
#else
|
||
|
|
CHECK_SI_SIZE (_timer, 4*sizeof(int));
|
||
|
|
#endif
|
||
|
|
static_assert(offsetof(siginfo32_t, si_tid) == 0x0C);
|
||
|
|
static_assert(offsetof(siginfo32_t, si_overrun) == 0x10);
|
||
|
|
static_assert(offsetof(siginfo32_t, si_value) == 0x14);
|
||
|
|
|
||
|
|
CHECK_SI_OFFSET(_rt);
|
||
|
|
CHECK_SI_SIZE (_rt, 3*sizeof(int));
|
||
|
|
static_assert(offsetof(siginfo32_t, si_pid) == 0x0C);
|
||
|
|
static_assert(offsetof(siginfo32_t, si_uid) == 0x10);
|
||
|
|
static_assert(offsetof(siginfo32_t, si_value) == 0x14);
|
||
|
|
|
||
|
|
CHECK_SI_OFFSET(_sigchld);
|
||
|
|
CHECK_SI_SIZE (_sigchld, 5*sizeof(int));
|
||
|
|
static_assert(offsetof(siginfo32_t, si_pid) == 0x0C);
|
||
|
|
static_assert(offsetof(siginfo32_t, si_uid) == 0x10);
|
||
|
|
static_assert(offsetof(siginfo32_t, si_status) == 0x14);
|
||
|
|
static_assert(offsetof(siginfo32_t, si_utime) == 0x18);
|
||
|
|
static_assert(offsetof(siginfo32_t, si_stime) == 0x1C);
|
||
|
|
|
||
|
|
CHECK_SI_OFFSET(_sigfault);
|
||
|
|
CHECK_SI_SIZE (_sigfault, 4*sizeof(int));
|
||
|
|
static_assert(offsetof(siginfo32_t, si_addr) == 0x0C);
|
||
|
|
|
||
|
|
static_assert(offsetof(siginfo32_t, si_trapno) == 0x10);
|
||
|
|
|
||
|
|
static_assert(offsetof(siginfo32_t, si_addr_lsb) == 0x10);
|
||
|
|
|
||
|
|
static_assert(offsetof(siginfo32_t, si_lower) == 0x14);
|
||
|
|
static_assert(offsetof(siginfo32_t, si_upper) == 0x18);
|
||
|
|
|
||
|
|
static_assert(offsetof(siginfo32_t, si_pkey) == 0x14);
|
||
|
|
|
||
|
|
static_assert(offsetof(siginfo32_t, si_perf_data) == 0x10);
|
||
|
|
static_assert(offsetof(siginfo32_t, si_perf_type) == 0x14);
|
||
|
|
static_assert(offsetof(siginfo32_t, si_perf_flags) == 0x18);
|
||
|
|
|
||
|
|
CHECK_SI_OFFSET(_sigpoll);
|
||
|
|
CHECK_SI_SIZE (_sigpoll, 2*sizeof(int));
|
||
|
|
static_assert(offsetof(siginfo32_t, si_band) == 0x0C);
|
||
|
|
static_assert(offsetof(siginfo32_t, si_fd) == 0x10);
|
||
|
|
|
||
|
|
CHECK_SI_OFFSET(_sigsys);
|
||
|
|
CHECK_SI_SIZE (_sigsys, 3*sizeof(int));
|
||
|
|
static_assert(offsetof(siginfo32_t, si_call_addr) == 0x0C);
|
||
|
|
static_assert(offsetof(siginfo32_t, si_syscall) == 0x10);
|
||
|
|
static_assert(offsetof(siginfo32_t, si_arch) == 0x14);
|
||
|
|
|
||
|
|
/* any new si_fields should be added here */
|