[LTP] [PATCH] syscalls/pread02: extend buffer to avoid glibc overflow detection

[Petr Vorel]

Hi Jan,

> Test started failing with recent glibc (glibc-2.34.9000-38.fc36),
> which detects that buffer in pread is potentially too small:
>   tst_test.c:1431: TINFO: Timeout per run is 0h 05m 00s
>   *** buffer overflow detected ***: terminated
>   tst_test.c:1484: TBROK: Test killed by SIGIOT/SIGABRT!

> (gdb) bt
>   #0  __pthread_kill_implementation at pthread_kill.c:44
>   #1  0x00007ffff7e46f73 in __pthread_kill_internal at pthread_kill.c:78
>   #2  0x00007ffff7df6a36 in __GI_raise at ../sysdeps/posix/raise.c:26
>   #3  0x00007ffff7de082f in __GI_abort () at abort.c:79
>   #4  0x00007ffff7e3b01e in __libc_message at ../sysdeps/posix/libc_fatal.c:155
>   #5  0x00007ffff7ed945a in __GI___fortify_fail at fortify_fail.c:26
>   #6  0x00007ffff7ed7dc6 in __GI___chk_fail () at chk_fail.c:28
>   #7  0x00007ffff7ed8214 in __pread_chk at pread_chk.c:26
>   #8  0x0000000000404d1a in pread at /usr/include/bits/unistd.h:74
>   #9  verify_pread (n=<optimized out>) at pread02.c:44
>   #10 0x000000000040dc19 in run_tests () at tst_test.c:1246
>   #11 testrun () at tst_test.c:1331
>   #12 fork_testrun () at tst_test.c:1462
>   #13 0x000000000040e9a1 in tst_run_tcases
>   #14 0x0000000000404bde in main

> Extend it to number of bytes we are trying to read from fd.

LGTM.

Acked-by: Petr Vorel <pvorel@suse.cz>

Kind regards,
Petr