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(sigcancel_handler): Change parameters to match handler for SA_SIGACTION. Check signal number and code to recognize invalid invocations.

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This commit is contained in:
Ulrich Drepper 2003-07-05 06:18:19 +00:00
parent bdbecaa3f1
commit a1ed6b4cab
1 changed files with 14 additions and 3 deletions
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17
nptl/init.c
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@ -132,8 +132,19 @@ static struct pthread_functions pthread_functions =
/* For asynchronous cancellation we use a signal. This is the handler. */
static void
sigcancel_handler (int sig __attribute ((unused)))
sigcancel_handler (int sig, siginfo_t *si, void *ctx)
{
/* Safety check. It would be possible to call this function for
other signals and send a signal from another thread. This is not
correct and might even be a security problem. Try to catch as
many incorrect invocations as possible. */
if (sig != SIGCANCEL
|| si->si_code != SI_TKILL)
/* XXX The Linux kernel currently does not report the correct PID
in the si->si_pid field. Once this is changed another test
will be added. */
return;
struct pthread *self = THREAD_SELF;
int oldval = THREAD_GETMEM (self, cancelhandling);
@ -209,8 +220,8 @@ __pthread_initialize_minimal_internal (void)
cannot install the handler we do not abort. Maybe we should, but
it is only asynchronous cancellation which is affected. */
struct sigaction sa;
sa.sa_handler = sigcancel_handler;
sa.sa_flags = 0;
sa.sa_sigaction = sigcancel_handler;
sa.sa_flags = SA_SIGINFO;
sigemptyset (&sa.sa_mask);
(void) __libc_sigaction (SIGCANCEL, &sa, NULL);