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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2020-12-29 12:24:28 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-01-20 11:13:53 -0300 |
| commit | 961d7cff51332b7b4ed98d4530a98f73355dda4b (patch) | |
| tree | a99241d06c8e58419c5bf65f14f149aa2620f4b3 /sysdeps/x86/cpu-features.c | |
| parent | 1006250ea2d683e684f65911d738bd84f55c06c1 (diff) | |
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stdlib: Add testcase for BZ #26241
Old implementation of realpath allocates a PATH_MAX using alloca for
each symlink in the path, leading to MAXSYMLINKS times PATH_MAX
maximum stack usage.
The test create a symlink with __eloop_threshold() loops and creates
a thread with minimum stack size (obtained through
support_small_stack_thread_attribute). The thread issues a stack
allocations that fill the thread allocated stack minus some slack
plus and the realpath usage (which assumes a bounded stack usage).
If realpath uses more than about 2 * PATH_MAX plus some slack it
triggers a stackoverflow.
Checked on x86_64-linux-gnu and i686-linux-gnu.
Reviewed-by: DJ Delorie <dj@redhat.com>
Diffstat (limited to 'sysdeps/x86/cpu-features.c')
0 files changed, 0 insertions, 0 deletions