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Diffstat (limited to 'arch/s390/kernel/compat_signal.c')
-rw-r--r--arch/s390/kernel/compat_signal.c148
1 files changed, 2 insertions, 146 deletions
diff --git a/arch/s390/kernel/compat_signal.c b/arch/s390/kernel/compat_signal.c
index 593fcc9253fc..6de049fbe62d 100644
--- a/arch/s390/kernel/compat_signal.c
+++ b/arch/s390/kernel/compat_signal.c
@@ -53,9 +53,6 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
{
int err;
- if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
- return -EFAULT;
-
/* If you change siginfo_t structure, please be sure
this code is fixed accordingly.
It should never copy any pad contained in the structure
@@ -110,9 +107,6 @@ int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
int err;
u32 tmp;
- if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t)))
- return -EFAULT;
-
err = __get_user(to->si_signo, &from->si_signo);
err |= __get_user(to->si_errno, &from->si_errno);
err |= __get_user(to->si_code, &from->si_code);
@@ -157,122 +151,6 @@ int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
return err;
}
-asmlinkage long
-sys32_sigaction(int sig, const struct old_sigaction32 __user *act,
- struct old_sigaction32 __user *oact)
-{
- struct k_sigaction new_ka, old_ka;
- unsigned long sa_handler, sa_restorer;
- int ret;
-
- if (act) {
- compat_old_sigset_t mask;
- if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
- __get_user(sa_handler, &act->sa_handler) ||
- __get_user(sa_restorer, &act->sa_restorer) ||
- __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
- __get_user(mask, &act->sa_mask))
- return -EFAULT;
- new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
- new_ka.sa.sa_restorer = (void (*)(void)) sa_restorer;
- siginitset(&new_ka.sa.sa_mask, mask);
- }
-
- ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
-
- if (!ret && oact) {
- sa_handler = (unsigned long) old_ka.sa.sa_handler;
- sa_restorer = (unsigned long) old_ka.sa.sa_restorer;
- if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
- __put_user(sa_handler, &oact->sa_handler) ||
- __put_user(sa_restorer, &oact->sa_restorer) ||
- __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
- __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
- return -EFAULT;
- }
-
- return ret;
-}
-
-asmlinkage long
-sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
- struct sigaction32 __user *oact, size_t sigsetsize)
-{
- struct k_sigaction new_ka, old_ka;
- unsigned long sa_handler;
- int ret;
- compat_sigset_t set32;
-
- /* XXX: Don't preclude handling different sized sigset_t's. */
- if (sigsetsize != sizeof(compat_sigset_t))
- return -EINVAL;
-
- if (act) {
- ret = get_user(sa_handler, &act->sa_handler);
- ret |= __copy_from_user(&set32, &act->sa_mask,
- sizeof(compat_sigset_t));
- new_ka.sa.sa_mask.sig[0] =
- set32.sig[0] | (((long)set32.sig[1]) << 32);
- ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
-
- if (ret)
- return -EFAULT;
- new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
- }
-
- ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
-
- if (!ret && oact) {
- set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
- set32.sig[0] = old_ka.sa.sa_mask.sig[0];
- ret = put_user((unsigned long)old_ka.sa.sa_handler, &oact->sa_handler);
- ret |= __copy_to_user(&oact->sa_mask, &set32,
- sizeof(compat_sigset_t));
- ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
- }
-
- return ret;
-}
-
-asmlinkage long
-sys32_sigaltstack(const stack_t32 __user *uss, stack_t32 __user *uoss)
-{
- struct pt_regs *regs = task_pt_regs(current);
- stack_t kss, koss;
- unsigned long ss_sp;
- int ret, err = 0;
- mm_segment_t old_fs = get_fs();
-
- if (uss) {
- if (!access_ok(VERIFY_READ, uss, sizeof(*uss)))
- return -EFAULT;
- err |= __get_user(ss_sp, &uss->ss_sp);
- err |= __get_user(kss.ss_size, &uss->ss_size);
- err |= __get_user(kss.ss_flags, &uss->ss_flags);
- if (err)
- return -EFAULT;
- kss.ss_sp = (void __user *) ss_sp;
- }
-
- set_fs (KERNEL_DS);
- ret = do_sigaltstack((stack_t __force __user *) (uss ? &kss : NULL),
- (stack_t __force __user *) (uoss ? &koss : NULL),
- regs->gprs[15]);
- set_fs (old_fs);
-
- if (!ret && uoss) {
- if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)))
- return -EFAULT;
- ss_sp = (unsigned long) koss.ss_sp;
- err |= __put_user(ss_sp, &uoss->ss_sp);
- err |= __put_user(koss.ss_size, &uoss->ss_size);
- err |= __put_user(koss.ss_flags, &uoss->ss_flags);
- if (err)
- return -EFAULT;
- }
- return ret;
-}
-
static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
{
_s390_regs_common32 regs32;
@@ -360,8 +238,6 @@ asmlinkage long sys32_sigreturn(void)
sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15];
sigset_t set;
- if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
- goto badframe;
if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32))
goto badframe;
set_current_blocked(&set);
@@ -380,13 +256,7 @@ asmlinkage long sys32_rt_sigreturn(void)
struct pt_regs *regs = task_pt_regs(current);
rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15];
sigset_t set;
- stack_t st;
- __u32 ss_sp;
- int err;
- mm_segment_t old_fs = get_fs();
- if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
- goto badframe;
if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
goto badframe;
set_current_blocked(&set);
@@ -394,15 +264,8 @@ asmlinkage long sys32_rt_sigreturn(void)
goto badframe;
if (restore_sigregs_gprs_high(regs, frame->gprs_high))
goto badframe;
- err = __get_user(ss_sp, &frame->uc.uc_stack.ss_sp);
- st.ss_sp = compat_ptr(ss_sp);
- err |= __get_user(st.ss_size, &frame->uc.uc_stack.ss_size);
- err |= __get_user(st.ss_flags, &frame->uc.uc_stack.ss_flags);
- if (err)
+ if (compat_restore_altstack(&frame->uc.uc_stack))
goto badframe;
- set_fs (KERNEL_DS);
- do_sigaltstack((stack_t __force __user *)&st, NULL, regs->gprs[15]);
- set_fs (old_fs);
return regs->gprs[2];
badframe:
force_sig(SIGSEGV, current);
@@ -452,8 +315,6 @@ static int setup_frame32(int sig, struct k_sigaction *ka,
sigset_t *set, struct pt_regs * regs)
{
sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(sigframe32));
- if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe32)))
- goto give_sigsegv;
if (frame == (void __user *) -1UL)
goto give_sigsegv;
@@ -518,8 +379,6 @@ static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info,
{
int err = 0;
rt_sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(rt_sigframe32));
- if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe32)))
- goto give_sigsegv;
if (frame == (void __user *) -1UL)
goto give_sigsegv;
@@ -530,10 +389,7 @@ static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info,
/* Create the ucontext. */
err |= __put_user(UC_EXTENDED, &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->gprs[15]),
- &frame->uc.uc_stack.ss_flags);
- err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
+ err |= __compat_save_altstack(&frame->uc.uc_stack, regs->gprs[15]);
err |= save_sigregs32(regs, &frame->uc.uc_mcontext);
err |= save_sigregs_gprs_high(regs, frame->gprs_high);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-12 01:49:15 +0000