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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2024-02-05 16:10:24 +0000 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2024-02-05 15:43:33 -0300 |
| commit | b09073e63138ce409bf6426cf820eeaa0d28ca74 (patch) | |
| tree | 9ec3447c153af8002d8463bf7f485f56df90ed6f /sysdeps/unix/sysv/linux/mq_receive.c | |
| parent | 0c5e5bace57578ed3e28eb89ee2d2b31b74c4ecc (diff) | |
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arm: Remove wrong ldr from _dl_start_user (BZ 31339)
The commit 49d877a80b29d3002887b084eec6676d9f5fec18 (arm: Remove
_dl_skip_args usage) removed the _SKIP_ARGS literal, which was
previously loader to r4 on loader _start. However, the cleanup did not
remove the following 'ldr r4, [sl, r4]' on _dl_start_user, used to check
to skip the arguments after ld self-relocations.
In my testing, the kernel initially set r4 to 0, which makes the
ldr instruction just read the _GLOBAL_OFFSET_TABLE_. However, since r4
is a callee-saved register; a different runtime might not zero
initialize it and thus trigger an invalid memory access.
Checked on arm-linux-gnu.
Reported-by: Adrian Ratiu <adrian.ratiu@collabora.com>
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
(cherry picked from commit 1e25112dc0cb2515d27d8d178b1ecce778a9d37a)
Diffstat (limited to 'sysdeps/unix/sysv/linux/mq_receive.c')
0 files changed, 0 insertions, 0 deletions