diff options
Diffstat (limited to 'linux-user/signal.c')
| -rw-r--r-- | linux-user/signal.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/linux-user/signal.c b/linux-user/signal.c index e2d55fff97..9d980456ec 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -636,8 +636,16 @@ static void host_signal_handler(int host_signum, siginfo_t *info, * code in case the guest code provokes one in the window between * now and it getting out to the main loop. Signals will be * unblocked again in process_pending_signals(). + * + * WARNING: we cannot use sigfillset() here because the uc_sigmask + * field is a kernel sigset_t, which is much smaller than the + * libc sigset_t which sigfillset() operates on. Using sigfillset() + * would write 0xff bytes off the end of the structure and trash + * data on the struct. + * We can't use sizeof(uc->uc_sigmask) either, because the libc + * headers define the struct field with the wrong (too large) type. */ - sigfillset(&uc->uc_sigmask); + memset(&uc->uc_sigmask, 0xff, SIGSET_T_SIZE); sigdelset(&uc->uc_sigmask, SIGSEGV); sigdelset(&uc->uc_sigmask, SIGBUS); |