x86: signal: use {get|put}_user_try and catch
Impact: use new framework
Use {get|put}_user_try, catch, and _ex in arch/x86/kernel/signal.c.
Note: this patch contains "WARNING: line over 80 characters", because when
introducing new block I insert an indent to avoid mistakes by edit.
Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Hiroshi Shimamoto
H. Peter Anvin
parent
fe40c0af3c
commit
98e3d45eda
@ -51,24 +51,24 @@
|
||||
#endif
|
||||
|
||||
#define COPY(x) { \
|
||||
err |= __get_user(regs->x, &sc->x); \
|
||||
get_user_ex(regs->x, &sc->x); \
|
||||
}
|
||||
|
||||
#define COPY_SEG(seg) { \
|
||||
unsigned short tmp; \
|
||||
err |= __get_user(tmp, &sc->seg); \
|
||||
get_user_ex(tmp, &sc->seg); \
|
||||
regs->seg = tmp; \
|
||||
}
|
||||
|
||||
#define COPY_SEG_CPL3(seg) { \
|
||||
unsigned short tmp; \
|
||||
err |= __get_user(tmp, &sc->seg); \
|
||||
get_user_ex(tmp, &sc->seg); \
|
||||
regs->seg = tmp | 3; \
|
||||
}
|
||||
|
||||
#define GET_SEG(seg) { \
|
||||
unsigned short tmp; \
|
||||
err |= __get_user(tmp, &sc->seg); \
|
||||
get_user_ex(tmp, &sc->seg); \
|
||||
loadsegment(seg, tmp); \
|
||||
}
|
||||
|
||||
@ -83,45 +83,49 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
|
||||
/* Always make any pending restarted system calls return -EINTR */
|
||||
current_thread_info()->restart_block.fn = do_no_restart_syscall;
|
||||
|
||||
get_user_try {
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
GET_SEG(gs);
|
||||
COPY_SEG(fs);
|
||||
COPY_SEG(es);
|
||||
COPY_SEG(ds);
|
||||
GET_SEG(gs);
|
||||
COPY_SEG(fs);
|
||||
COPY_SEG(es);
|
||||
COPY_SEG(ds);
|
||||
#endif /* CONFIG_X86_32 */
|
||||
|
||||
COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
|
||||
COPY(dx); COPY(cx); COPY(ip);
|
||||
COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
|
||||
COPY(dx); COPY(cx); COPY(ip);
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
COPY(r8);
|
||||
COPY(r9);
|
||||
COPY(r10);
|
||||
COPY(r11);
|
||||
COPY(r12);
|
||||
COPY(r13);
|
||||
COPY(r14);
|
||||
COPY(r15);
|
||||
COPY(r8);
|
||||
COPY(r9);
|
||||
COPY(r10);
|
||||
COPY(r11);
|
||||
COPY(r12);
|
||||
COPY(r13);
|
||||
COPY(r14);
|
||||
COPY(r15);
|
||||
#endif /* CONFIG_X86_64 */
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
COPY_SEG_CPL3(cs);
|
||||
COPY_SEG_CPL3(ss);
|
||||
COPY_SEG_CPL3(cs);
|
||||
COPY_SEG_CPL3(ss);
|
||||
#else /* !CONFIG_X86_32 */
|
||||
/* Kernel saves and restores only the CS segment register on signals,
|
||||
* which is the bare minimum needed to allow mixed 32/64-bit code.
|
||||
* App's signal handler can save/restore other segments if needed. */
|
||||
COPY_SEG_CPL3(cs);
|
||||
/* Kernel saves and restores only the CS segment register on signals,
|
||||
* which is the bare minimum needed to allow mixed 32/64-bit code.
|
||||
* App's signal handler can save/restore other segments if needed. */
|
||||
COPY_SEG_CPL3(cs);
|
||||
#endif /* CONFIG_X86_32 */
|
||||
|
||||
err |= __get_user(tmpflags, &sc->flags);
|
||||
regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
|
||||
regs->orig_ax = -1; /* disable syscall checks */
|
||||
get_user_ex(tmpflags, &sc->flags);
|
||||
regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
|
||||
regs->orig_ax = -1; /* disable syscall checks */
|
||||
|
||||
err |= __get_user(buf, &sc->fpstate);
|
||||
err |= restore_i387_xstate(buf);
|
||||
get_user_ex(buf, &sc->fpstate);
|
||||
err |= restore_i387_xstate(buf);
|
||||
|
||||
get_user_ex(*pax, &sc->ax);
|
||||
} get_user_catch(err);
|
||||
|
||||
err |= __get_user(*pax, &sc->ax);
|
||||
return err;
|
||||
}
|
||||
|
||||
@ -131,57 +135,60 @@ setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
|
||||
{
|
||||
int err = 0;
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
{
|
||||
unsigned int tmp;
|
||||
put_user_try {
|
||||
|
||||
savesegment(gs, tmp);
|
||||
err |= __put_user(tmp, (unsigned int __user *)&sc->gs);
|
||||
}
|
||||
err |= __put_user(regs->fs, (unsigned int __user *)&sc->fs);
|
||||
err |= __put_user(regs->es, (unsigned int __user *)&sc->es);
|
||||
err |= __put_user(regs->ds, (unsigned int __user *)&sc->ds);
|
||||
#ifdef CONFIG_X86_32
|
||||
{
|
||||
unsigned int tmp;
|
||||
|
||||
savesegment(gs, tmp);
|
||||
put_user_ex(tmp, (unsigned int __user *)&sc->gs);
|
||||
}
|
||||
put_user_ex(regs->fs, (unsigned int __user *)&sc->fs);
|
||||
put_user_ex(regs->es, (unsigned int __user *)&sc->es);
|
||||
put_user_ex(regs->ds, (unsigned int __user *)&sc->ds);
|
||||
#endif /* CONFIG_X86_32 */
|
||||
|
||||
err |= __put_user(regs->di, &sc->di);
|
||||
err |= __put_user(regs->si, &sc->si);
|
||||
err |= __put_user(regs->bp, &sc->bp);
|
||||
err |= __put_user(regs->sp, &sc->sp);
|
||||
err |= __put_user(regs->bx, &sc->bx);
|
||||
err |= __put_user(regs->dx, &sc->dx);
|
||||
err |= __put_user(regs->cx, &sc->cx);
|
||||
err |= __put_user(regs->ax, &sc->ax);
|
||||
put_user_ex(regs->di, &sc->di);
|
||||
put_user_ex(regs->si, &sc->si);
|
||||
put_user_ex(regs->bp, &sc->bp);
|
||||
put_user_ex(regs->sp, &sc->sp);
|
||||
put_user_ex(regs->bx, &sc->bx);
|
||||
put_user_ex(regs->dx, &sc->dx);
|
||||
put_user_ex(regs->cx, &sc->cx);
|
||||
put_user_ex(regs->ax, &sc->ax);
|
||||
#ifdef CONFIG_X86_64
|
||||
err |= __put_user(regs->r8, &sc->r8);
|
||||
err |= __put_user(regs->r9, &sc->r9);
|
||||
err |= __put_user(regs->r10, &sc->r10);
|
||||
err |= __put_user(regs->r11, &sc->r11);
|
||||
err |= __put_user(regs->r12, &sc->r12);
|
||||
err |= __put_user(regs->r13, &sc->r13);
|
||||
err |= __put_user(regs->r14, &sc->r14);
|
||||
err |= __put_user(regs->r15, &sc->r15);
|
||||
put_user_ex(regs->r8, &sc->r8);
|
||||
put_user_ex(regs->r9, &sc->r9);
|
||||
put_user_ex(regs->r10, &sc->r10);
|
||||
put_user_ex(regs->r11, &sc->r11);
|
||||
put_user_ex(regs->r12, &sc->r12);
|
||||
put_user_ex(regs->r13, &sc->r13);
|
||||
put_user_ex(regs->r14, &sc->r14);
|
||||
put_user_ex(regs->r15, &sc->r15);
|
||||
#endif /* CONFIG_X86_64 */
|
||||
|
||||
err |= __put_user(current->thread.trap_no, &sc->trapno);
|
||||
err |= __put_user(current->thread.error_code, &sc->err);
|
||||
err |= __put_user(regs->ip, &sc->ip);
|
||||
put_user_ex(current->thread.trap_no, &sc->trapno);
|
||||
put_user_ex(current->thread.error_code, &sc->err);
|
||||
put_user_ex(regs->ip, &sc->ip);
|
||||
#ifdef CONFIG_X86_32
|
||||
err |= __put_user(regs->cs, (unsigned int __user *)&sc->cs);
|
||||
err |= __put_user(regs->flags, &sc->flags);
|
||||
err |= __put_user(regs->sp, &sc->sp_at_signal);
|
||||
err |= __put_user(regs->ss, (unsigned int __user *)&sc->ss);
|
||||
put_user_ex(regs->cs, (unsigned int __user *)&sc->cs);
|
||||
put_user_ex(regs->flags, &sc->flags);
|
||||
put_user_ex(regs->sp, &sc->sp_at_signal);
|
||||
put_user_ex(regs->ss, (unsigned int __user *)&sc->ss);
|
||||
#else /* !CONFIG_X86_32 */
|
||||
err |= __put_user(regs->flags, &sc->flags);
|
||||
err |= __put_user(regs->cs, &sc->cs);
|
||||
err |= __put_user(0, &sc->gs);
|
||||
err |= __put_user(0, &sc->fs);
|
||||
put_user_ex(regs->flags, &sc->flags);
|
||||
put_user_ex(regs->cs, &sc->cs);
|
||||
put_user_ex(0, &sc->gs);
|
||||
put_user_ex(0, &sc->fs);
|
||||
#endif /* CONFIG_X86_32 */
|
||||
|
||||
err |= __put_user(fpstate, &sc->fpstate);
|
||||
put_user_ex(fpstate, &sc->fpstate);
|
||||
|
||||
/* non-iBCS2 extensions.. */
|
||||
err |= __put_user(mask, &sc->oldmask);
|
||||
err |= __put_user(current->thread.cr2, &sc->cr2);
|
||||
/* non-iBCS2 extensions.. */
|
||||
put_user_ex(mask, &sc->oldmask);
|
||||
put_user_ex(current->thread.cr2, &sc->cr2);
|
||||
} put_user_catch(err);
|
||||
|
||||
return err;
|
||||
}
|
||||
@ -336,43 +343,41 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
|
||||
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
||||
return -EFAULT;
|
||||
|
||||
err |= __put_user(sig, &frame->sig);
|
||||
err |= __put_user(&frame->info, &frame->pinfo);
|
||||
err |= __put_user(&frame->uc, &frame->puc);
|
||||
err |= copy_siginfo_to_user(&frame->info, info);
|
||||
if (err)
|
||||
return -EFAULT;
|
||||
put_user_try {
|
||||
put_user_ex(sig, &frame->sig);
|
||||
put_user_ex(&frame->info, &frame->pinfo);
|
||||
put_user_ex(&frame->uc, &frame->puc);
|
||||
err |= copy_siginfo_to_user(&frame->info, info);
|
||||
|
||||
/* Create the ucontext. */
|
||||
if (cpu_has_xsave)
|
||||
err |= __put_user(UC_FP_XSTATE, &frame->uc.uc_flags);
|
||||
else
|
||||
err |= __put_user(0, &frame->uc.uc_flags);
|
||||
err |= __put_user(0, &frame->uc.uc_link);
|
||||
err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
|
||||
err |= __put_user(sas_ss_flags(regs->sp),
|
||||
&frame->uc.uc_stack.ss_flags);
|
||||
err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
|
||||
err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
|
||||
regs, set->sig[0]);
|
||||
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
||||
if (err)
|
||||
return -EFAULT;
|
||||
/* Create the ucontext. */
|
||||
if (cpu_has_xsave)
|
||||
put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
|
||||
else
|
||||
put_user_ex(0, &frame->uc.uc_flags);
|
||||
put_user_ex(0, &frame->uc.uc_link);
|
||||
put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
|
||||
put_user_ex(sas_ss_flags(regs->sp),
|
||||
&frame->uc.uc_stack.ss_flags);
|
||||
put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
|
||||
err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
|
||||
regs, set->sig[0]);
|
||||
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
||||
|
||||
/* Set up to return from userspace. */
|
||||
restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn);
|
||||
if (ka->sa.sa_flags & SA_RESTORER)
|
||||
restorer = ka->sa.sa_restorer;
|
||||
err |= __put_user(restorer, &frame->pretcode);
|
||||
/* Set up to return from userspace. */
|
||||
restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn);
|
||||
if (ka->sa.sa_flags & SA_RESTORER)
|
||||
restorer = ka->sa.sa_restorer;
|
||||
put_user_ex(restorer, &frame->pretcode);
|
||||
|
||||
/*
|
||||
* This is movl $__NR_rt_sigreturn, %ax ; int $0x80
|
||||
*
|
||||
* WE DO NOT USE IT ANY MORE! It's only left here for historical
|
||||
* reasons and because gdb uses it as a signature to notice
|
||||
* signal handler stack frames.
|
||||
*/
|
||||
err |= __put_user(*((u64 *)&rt_retcode), (u64 *)frame->retcode);
|
||||
/*
|
||||
* This is movl $__NR_rt_sigreturn, %ax ; int $0x80
|
||||
*
|
||||
* WE DO NOT USE IT ANY MORE! It's only left here for historical
|
||||
* reasons and because gdb uses it as a signature to notice
|
||||
* signal handler stack frames.
|
||||
*/
|
||||
put_user_ex(*((u64 *)&rt_retcode), (u64 *)frame->retcode);
|
||||
} put_user_catch(err);
|
||||
|
||||
if (err)
|
||||
return -EFAULT;
|
||||
@ -436,28 +441,30 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
/* Create the ucontext. */
|
||||
if (cpu_has_xsave)
|
||||
err |= __put_user(UC_FP_XSTATE, &frame->uc.uc_flags);
|
||||
else
|
||||
err |= __put_user(0, &frame->uc.uc_flags);
|
||||
err |= __put_user(0, &frame->uc.uc_link);
|
||||
err |= __put_user(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
|
||||
err |= __put_user(sas_ss_flags(regs->sp),
|
||||
&frame->uc.uc_stack.ss_flags);
|
||||
err |= __put_user(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
|
||||
err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]);
|
||||
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
||||
put_user_try {
|
||||
/* Create the ucontext. */
|
||||
if (cpu_has_xsave)
|
||||
put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
|
||||
else
|
||||
put_user_ex(0, &frame->uc.uc_flags);
|
||||
put_user_ex(0, &frame->uc.uc_link);
|
||||
put_user_ex(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
|
||||
put_user_ex(sas_ss_flags(regs->sp),
|
||||
&frame->uc.uc_stack.ss_flags);
|
||||
put_user_ex(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
|
||||
err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]);
|
||||
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
||||
|
||||
/* Set up to return from userspace. If provided, use a stub
|
||||
already in userspace. */
|
||||
/* x86-64 should always use SA_RESTORER. */
|
||||
if (ka->sa.sa_flags & SA_RESTORER) {
|
||||
err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
|
||||
} else {
|
||||
/* could use a vstub here */
|
||||
return -EFAULT;
|
||||
}
|
||||
/* Set up to return from userspace. If provided, use a stub
|
||||
already in userspace. */
|
||||
/* x86-64 should always use SA_RESTORER. */
|
||||
if (ka->sa.sa_flags & SA_RESTORER) {
|
||||
put_user_ex(ka->sa.sa_restorer, &frame->pretcode);
|
||||
} else {
|
||||
/* could use a vstub here */
|
||||
err |= -EFAULT;
|
||||
}
|
||||
} put_user_catch(err);
|
||||
|
||||
if (err)
|
||||
return -EFAULT;
|
||||
@ -509,31 +516,41 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
|
||||
struct old_sigaction __user *oact)
|
||||
{
|
||||
struct k_sigaction new_ka, old_ka;
|
||||
int ret;
|
||||
int ret = 0;
|
||||
|
||||
if (act) {
|
||||
old_sigset_t mask;
|
||||
|
||||
if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
|
||||
__get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
|
||||
__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
|
||||
if (!access_ok(VERIFY_READ, act, sizeof(*act)))
|
||||
return -EFAULT;
|
||||
|
||||
__get_user(new_ka.sa.sa_flags, &act->sa_flags);
|
||||
__get_user(mask, &act->sa_mask);
|
||||
get_user_try {
|
||||
get_user_ex(new_ka.sa.sa_handler, &act->sa_handler);
|
||||
get_user_ex(new_ka.sa.sa_flags, &act->sa_flags);
|
||||
get_user_ex(mask, &act->sa_mask);
|
||||
get_user_ex(new_ka.sa.sa_restorer, &act->sa_restorer);
|
||||
} get_user_catch(ret);
|
||||
|
||||
if (ret)
|
||||
return -EFAULT;
|
||||
siginitset(&new_ka.sa.sa_mask, mask);
|
||||
}
|
||||
|
||||
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
|
||||
|
||||
if (!ret && oact) {
|
||||
if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
|
||||
__put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
|
||||
__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
|
||||
if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
|
||||
return -EFAULT;
|
||||
|
||||
__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
|
||||
__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
|
||||
put_user_try {
|
||||
put_user_ex(old_ka.sa.sa_handler, &oact->sa_handler);
|
||||
put_user_ex(old_ka.sa.sa_flags, &oact->sa_flags);
|
||||
put_user_ex(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
|
||||
put_user_ex(old_ka.sa.sa_restorer, &oact->sa_restorer);
|
||||
} put_user_catch(ret);
|
||||
|
||||
if (ret)
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
return ret;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user