diff options
Diffstat (limited to 'arch/s390/kernel/compat_signal.c')
| -rw-r--r-- | arch/s390/kernel/compat_signal.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/s390/kernel/compat_signal.c b/arch/s390/kernel/compat_signal.c index a5692c460bad..c7f02e777af2 100644 --- a/arch/s390/kernel/compat_signal.c +++ b/arch/s390/kernel/compat_signal.c @@ -29,6 +29,7 @@ #include <asm/lowcore.h> #include "compat_linux.h" #include "compat_ptrace.h" +#include "entry.h" #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) @@ -428,6 +429,10 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) /* Default to using normal stack */ sp = (unsigned long) A(regs->gprs[15]); + /* Overflow on alternate signal stack gives SIGSEGV. */ + if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL)) + return (void __user *) -1UL; + /* This is the X/Open sanctioned signal stack switching. */ if (ka->sa.sa_flags & SA_ONSTACK) { if (! sas_ss_flags(sp)) @@ -461,6 +466,9 @@ static int setup_frame32(int sig, struct k_sigaction *ka, if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe32))) goto give_sigsegv; + if (frame == (void __user *) -1UL) + goto give_sigsegv; + if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE32)) goto give_sigsegv; @@ -514,6 +522,9 @@ static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info, if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe32))) goto give_sigsegv; + if (frame == (void __user *) -1UL) + goto give_sigsegv; + if (copy_siginfo_to_user32(&frame->info, info)) goto give_sigsegv; |