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Diffstat (limited to 'libc/sysdeps/linux/x86_64/sigaction.c')
-rw-r--r--libc/sysdeps/linux/x86_64/sigaction.c20
1 files changed, 13 insertions, 7 deletions
diff --git a/libc/sysdeps/linux/x86_64/sigaction.c b/libc/sysdeps/linux/x86_64/sigaction.c
index 3d9e4ea29..e53e30442 100644
--- a/libc/sysdeps/linux/x86_64/sigaction.c
+++ b/libc/sysdeps/linux/x86_64/sigaction.c
@@ -50,23 +50,29 @@ __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
{
int result;
struct kernel_sigaction kact, koact;
+ enum {
+ SIGSET_MIN_SIZE = sizeof(kact.sa_mask) < sizeof(act->sa_mask)
+ ? sizeof(kact.sa_mask) : sizeof(act->sa_mask)
+ };
if (act) {
kact.k_sa_handler = act->sa_handler;
- memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
+ memcpy (&kact.sa_mask, &act->sa_mask, SIGSET_MIN_SIZE);
kact.sa_flags = act->sa_flags | SA_RESTORER;
kact.sa_restorer = &restore_rt;
}
- /* XXX The size argument hopefully will have to be changed to the
- real size of the user-level sigset_t. */
- result = INLINE_SYSCALL (rt_sigaction, 4,
- sig, act ? __ptrvalue (&kact) : NULL,
- oact ? __ptrvalue (&koact) : NULL, _NSIG / 8);
+ /* NB: kernel (as of 2.6.25) will return EINVAL
+ * if sizeof(kact.sa_mask) does not match kernel's sizeof(sigset_t) */
+ result = INLINE_SYSCALL (rt_sigaction, 4, sig,
+ act ? __ptrvalue (&kact) : NULL,
+ oact ? __ptrvalue (&koact) : NULL,
+ sizeof(kact.sa_mask));
+
if (oact && result >= 0) {
oact->sa_handler = koact.k_sa_handler;
- memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
+ memcpy (&oact->sa_mask, &koact.sa_mask, SIGSET_MIN_SIZE);
oact->sa_flags = koact.sa_flags;
oact->sa_restorer = koact.sa_restorer;
}