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stdlib: Fix BZ #26241 testcase on GNU/Hurd

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GNU/Hurd's readlink system call is partly implemented in userspace, which
also allocates a buffer on the stack for the result, and thus needs one
more path.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Samuel Thibault 2021-03-24 01:36:20 +01:00
parent 16b597807d
commit 4631c2372a
1 changed files with 4 additions and 3 deletions
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7
stdlib/tst-canon-bz26341.c
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@ -67,15 +67,16 @@ do_realpath (void *arg)
for each symlink in the path, leading to MAXSYMLINKS times PATH_MAX
maximum stack usage.
This stack allocations tries fill the thread allocated stack minus
both the resolved path (plus some slack) and the realpath (plus some
slack).
the resolved path (plus some slack), the realpath (plus some
slack), and the system call usage (plus some slack).
If realpath uses more than 2 * PATH_MAX plus some slack it will trigger
a stackoverflow. */
const size_t syscall_usage = 1 * PATH_MAX + 1024;
const size_t realpath_usage = 2 * PATH_MAX + 1024;
const size_t thread_usage = 1 * PATH_MAX + 1024;
size_t stack_size = support_small_thread_stack_size ()
- realpath_usage - thread_usage;
- syscall_usage - realpath_usage - thread_usage;
char stack[stack_size];
char *resolved = stack + stack_size - thread_usage + 1024;