diff options
| author | Maninder Singh <maninder1.s@samsung.com> | 2018-01-10 15:17:30 +0000 |
|---|---|---|
| committer | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2021-04-06 14:44:09 +0100 |
| commit | 395be7c2184645320c955b0ba214af9fa1ea9675 (patch) | |
| tree | dd3d5623c2fbf20dcae590efcfdfa58c6f48dc34 /rt/mq_close.c | |
| parent | 69499bb6eeb4f5d1b3502758208301d21042a783 (diff) | |
| download | glibc-395be7c2184645320c955b0ba214af9fa1ea9675.tar glibc-395be7c2184645320c955b0ba214af9fa1ea9675.tar.gz glibc-395be7c2184645320c955b0ba214af9fa1ea9675.tar.bz2 glibc-395be7c2184645320c955b0ba214af9fa1ea9675.zip | |
elf: Fix data race in _dl_name_match_p [BZ #21349]
dlopen updates libname_list by writing to lastp->next, but concurrent
reads in _dl_name_match_p were not synchronized when it was called
without holding GL(dl_load_lock), which can happen during lazy symbol
resolution.
This patch fixes the race between _dl_name_match_p reading lastp->next
and add_name_to_object writing to it. This could cause segfault on
targets with weak memory order when lastp->next->name is read, which
was observed on an arm system. Fixes bug 21349.
(Code is from Maninder Singh, comments and description is from Szabolcs
Nagy.)
Co-authored-by: Vaneet Narang <v.narang@samsung.com>
Co-authored-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'rt/mq_close.c')
0 files changed, 0 insertions, 0 deletions