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Diffstat (limited to 'arch/s390/kernel/compat_signal.c')
-rw-r--r--arch/s390/kernel/compat_signal.c71
1 files changed, 28 insertions, 43 deletions
diff --git a/arch/s390/kernel/compat_signal.c b/arch/s390/kernel/compat_signal.c
index a9a285b8c4a..4f68c81d3ff 100644
--- a/arch/s390/kernel/compat_signal.c
+++ b/arch/s390/kernel/compat_signal.c
@@ -141,7 +141,8 @@ int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
break;
case __SI_FAULT >> 16:
err |= __get_user(tmp, &from->si_addr);
- to->si_addr = (void __user *)(u64) (tmp & PSW32_ADDR_INSN);
+ to->si_addr = (void __force __user *)
+ (u64) (tmp & PSW32_ADDR_INSN);
break;
case __SI_POLL >> 16:
err |= __get_user(to->si_band, &from->si_band);
@@ -213,16 +214,8 @@ sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
ret = get_user(sa_handler, &act->sa_handler);
ret |= __copy_from_user(&set32, &act->sa_mask,
sizeof(compat_sigset_t));
- switch (_NSIG_WORDS) {
- case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6]
- | (((long)set32.sig[7]) << 32);
- case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4]
- | (((long)set32.sig[5]) << 32);
- case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2]
- | (((long)set32.sig[3]) << 32);
- case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0]
- | (((long)set32.sig[1]) << 32);
- }
+ 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)
@@ -233,20 +226,8 @@ sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
if (!ret && oact) {
- switch (_NSIG_WORDS) {
- case 4:
- set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32);
- set32.sig[6] = old_ka.sa.sa_mask.sig[3];
- case 3:
- set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32);
- set32.sig[4] = old_ka.sa.sa_mask.sig[2];
- case 2:
- set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32);
- set32.sig[2] = old_ka.sa.sa_mask.sig[1];
- case 1:
- set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
- set32.sig[0] = old_ka.sa.sa_mask.sig[0];
- }
+ 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));
@@ -300,9 +281,10 @@ static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
_s390_regs_common32 regs32;
int err, i;
- regs32.psw.mask = PSW32_MASK_MERGE(psw32_user_bits,
- (__u32)(regs->psw.mask >> 32));
- regs32.psw.addr = PSW32_ADDR_AMODE31 | (__u32) regs->psw.addr;
+ regs32.psw.mask = psw32_user_bits |
+ ((__u32)(regs->psw.mask >> 32) & PSW32_MASK_USER);
+ regs32.psw.addr = (__u32) regs->psw.addr |
+ (__u32)(regs->psw.mask & PSW_MASK_BA);
for (i = 0; i < NUM_GPRS; i++)
regs32.gprs[i] = (__u32) regs->gprs[i];
save_access_regs(current->thread.acrs);
@@ -327,8 +309,9 @@ static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
err = __copy_from_user(&regs32, &sregs->regs, sizeof(regs32));
if (err)
return err;
- regs->psw.mask = PSW_MASK_MERGE(regs->psw.mask,
- (__u64)regs32.psw.mask << 32);
+ regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
+ (__u64)(regs32.psw.mask & PSW32_MASK_USER) << 32 |
+ (__u64)(regs32.psw.addr & PSW32_ADDR_AMODE);
regs->psw.addr = (__u64)(regs32.psw.addr & PSW32_ADDR_INSN);
for (i = 0; i < NUM_GPRS; i++)
regs->gprs[i] = (__u64) regs32.gprs[i];
@@ -342,7 +325,7 @@ static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
return err;
restore_fp_regs(&current->thread.fp_regs);
- regs->svcnr = 0; /* disable syscall checks */
+ clear_thread_flag(TIF_SYSCALL); /* No longer in a system call */
return 0;
}
@@ -496,11 +479,11 @@ static int setup_frame32(int sig, struct k_sigaction *ka,
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa.sa_flags & SA_RESTORER) {
- regs->gprs[14] = (__u64) ka->sa.sa_restorer;
+ regs->gprs[14] = (__u64) ka->sa.sa_restorer | PSW32_ADDR_AMODE;
} else {
- regs->gprs[14] = (__u64) frame->retcode;
+ regs->gprs[14] = (__u64) frame->retcode | PSW32_ADDR_AMODE;
if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn,
- (u16 __user *)(frame->retcode)))
+ (u16 __force __user *)(frame->retcode)))
goto give_sigsegv;
}
@@ -509,11 +492,12 @@ static int setup_frame32(int sig, struct k_sigaction *ka,
goto give_sigsegv;
/* Set up registers for signal handler */
- regs->gprs[15] = (__u64) frame;
- regs->psw.addr = (__u64) ka->sa.sa_handler;
+ regs->gprs[15] = (__force __u64) frame;
+ regs->psw.mask |= PSW_MASK_BA; /* force amode 31 */
+ regs->psw.addr = (__force __u64) ka->sa.sa_handler;
regs->gprs[2] = map_signal(sig);
- regs->gprs[3] = (__u64) &frame->sc;
+ regs->gprs[3] = (__force __u64) &frame->sc;
/* We forgot to include these in the sigcontext.
To avoid breaking binary compatibility, they are passed as args. */
@@ -521,7 +505,7 @@ static int setup_frame32(int sig, struct k_sigaction *ka,
regs->gprs[5] = current->thread.prot_addr;
/* Place signal number on stack to allow backtrace from handler. */
- if (__put_user(regs->gprs[2], (int __user *) &frame->signo))
+ if (__put_user(regs->gprs[2], (int __force __user *) &frame->signo))
goto give_sigsegv;
return 0;
@@ -564,20 +548,21 @@ static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info,
} else {
regs->gprs[14] = (__u64) frame->retcode;
err |= __put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn,
- (u16 __user *)(frame->retcode));
+ (u16 __force __user *)(frame->retcode));
}
/* Set up backchain. */
- if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
+ if (__put_user(regs->gprs[15], (unsigned int __force __user *) frame))
goto give_sigsegv;
/* Set up registers for signal handler */
- regs->gprs[15] = (__u64) frame;
+ regs->gprs[15] = (__force __u64) frame;
+ regs->psw.mask |= PSW_MASK_BA; /* force amode 31 */
regs->psw.addr = (__u64) ka->sa.sa_handler;
regs->gprs[2] = map_signal(sig);
- regs->gprs[3] = (__u64) &frame->info;
- regs->gprs[4] = (__u64) &frame->uc;
+ regs->gprs[3] = (__force __u64) &frame->info;
+ regs->gprs[4] = (__force __u64) &frame->uc;
return 0;
give_sigsegv:
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-01-03 08:45:37 +0000