BUG: KASAN: global-out-of-bounds in ata_exec_internal_sg+0x50f/0xc70

[Jeffrin Thalakkottoor]

hello all ,

i encountered a KASAN bug related .    here are some related information...


-------------------x-----------------------------x------------------
[   30.037312] BUG: KASAN: global-out-of-bounds in
ata_exec_internal_sg+0x50f/0xc70
[   30.037447] Read of size 16 at addr ffffffff91f41f80 by task scsi_eh_1/149


[   30.039935] The buggy address belongs to the variable:
[   30.040059]  cdb.48319+0x0/0x40

[   30.040241] Memory state around the buggy address:
[   30.040362]  ffffffff91f41e80: fa fa fa fa 00 00 fa fa fa fa fa fa
00 00 07 fa
[   30.040498]  ffffffff91f41f00: fa fa fa fa 00 00 00 00 00 00 00 03
fa fa fa fa
[   30.040628] >ffffffff91f41f80: 00 04 fa fa fa fa fa fa 00 00 fa fa
fa fa fa fa
[   30.040755]                       ^
[   30.040868]  ffffffff91f42000: 00 00 00 04 fa fa fa fa 00 fa fa fa
fa fa fa fa
[   30.041003]  ffffffff91f42080: 04 fa fa fa fa fa fa fa 00 04 fa fa
fa fa fa fa

---------------------------x--------------------------x----------------
$uname -a
Linux debian 5.2.0-rc7+ #4 SMP Tue Jul 9 02:54:07 IST 2019 x86_64 GNU/Linux
$

--------------------x----------------------------x---------------------------
(gdb) l *ata_exec_internal_sg+0x50f
0xffffffff81c7b59f is in ata_exec_internal_sg (./include/linux/string.h:359).
354 if (q_size < size)
355 __read_overflow2();
356 }
357 if (p_size < size || q_size < size)
358 fortify_panic(__func__);
359 return __builtin_memcpy(p, q, size);
360 }
361
362 __FORTIFY_INLINE void *memmove(void *p, const void *q, __kernel_size_t size)
363 {
(gdb)
--------------------------x--------------------------
GNU Make            4.2.1
Binutils            2.31.1
Util-linux          2.33.1
Mount                2.33.1
Linux C Library      2.28
Dynamic linker (ldd) 2.28
Procps              3.3.15
Kbd                  2.0.4
Console-tools        2.0.4
Sh-utils            8.30
Udev                241
---------------------x--------------------------------x
Thread model: posix
gcc version 8.3.0 (Debian 8.3.0-7)
---------------------x--------------------------------x

Please ask if more information is needed.

-- 
software engineer
rajagiri school of engineering and technology