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(pthread_getattr_np): Make sure stack info returned for main thread does not overlap with any other VMA.

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This commit is contained in:
Ulrich Drepper 2003-12-31 23:41:06 +00:00
parent e039fb25f0
commit c49e3d227e
1 changed files with 9 additions and 6 deletions
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15
nptl/pthread_getattr_np.c
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@ -98,6 +98,7 @@ pthread_getattr_np (thread_id, attr)
char *line = NULL;
size_t linelen = 0;
uintptr_t last_to = 0;
while (! feof_unlocked (fp))
{
@ -106,23 +107,25 @@ pthread_getattr_np (thread_id, attr)
uintptr_t from;
uintptr_t to;
if (sscanf (line, "%" SCNxPTR "-%" SCNxPTR, &from, &to) == 2
&& from <= (uintptr_t) __libc_stack_end
if (sscanf (line, "%" SCNxPTR "-%" SCNxPTR, &from, &to) != 2)
continue;
if (from <= (uintptr_t) __libc_stack_end
&& (uintptr_t) __libc_stack_end < to)
{
/* Found the entry. Now we have the info we need. */
iattr->stacksize = rl.rlim_cur;
iattr->stackaddr = (void *) to;
/* The limit might be too high. This is a bogus
situation but try to avoid making it worse. */
if ((size_t) iattr->stacksize > (size_t) iattr->stackaddr)
iattr->stacksize = (size_t) iattr->stackaddr;
/* The limit might be too high. */
if ((size_t) iattr->stacksize
> (size_t) iattr->stackaddr - last_to)
iattr->stacksize = (size_t) iattr->stackaddr - last_to;
/* We succeed and no need to look further. */
ret = 0;
break;
}
last_to = to;
}
fclose (fp);