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protect against cancellation in dlopen 

i'm not sure that it's "correct" for dlopen to block cancellation
when calling constructors for libraries it loads, but it sure seems
like the right thing. in any case, dlopen itself needs cancellation
blocked.
This commit is contained in:
Rich Felker 2012-02-07 20:31:27 -05:00
parent 700a8156ad
commit f2baf4d7b8
1 changed files with 5 additions and 2 deletions
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7
src/ldso/dynlink.c
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@ -610,9 +610,11 @@ void *dlopen(const char *file, int mode)
{
struct dso *volatile p, *orig_tail = tail, *next;
size_t i;
int cs;
if (!file) return head;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
pthread_rwlock_wrlock(&lock);
if (setjmp(rtld_fail)) {
@ -628,8 +630,8 @@ void *dlopen(const char *file, int mode)
}
tail = orig_tail;
tail->next = 0;
pthread_rwlock_unlock(&lock);
return 0;
p = 0;
goto end;
}
p = load_library(file);
@ -658,6 +660,7 @@ void *dlopen(const char *file, int mode)
do_init_fini(tail);
end:
pthread_rwlock_unlock(&lock);
pthread_setcancelstate(cs, 0);
return p;
}