https://bugzilla.suse.com/show_bug.cgi?id=1193139
Bug ID: 1193139
Summary: [x86_64, 32-bit] mpx support broken
Classification: openSUSE
Product: openSUSE Distribution
Version: Leap 15.3
Hardware: x86
OS: Other
Status: NEW
Severity: Normal
Priority: P5 - None
Component: Kernel
Assignee: kernel-bugs@opensuse.org
Reporter: tdevries@suse.com
QA Contact: qa-bugs@suse.de
Found By: ---
Blocker: ---
Consider test-case mpx-out-of-bounds.c (
https://01.org/blogs/2016/intel-mpx-linux ):
...
$ cat mpx-out-of-bounds.c
#include
#include
#include
#define noinline __attribute__((noinline))
char dog[] = "dog";
char password[] = "secr3t";
noinline
char dog_letter(int nr)
{
return dog[nr];
}
int main(int argc, char **argv)
{
int max = sizeof(dog);
int i;
if (argc >= 2)
max = atoi(argv[1]);
for (i = 0; i < max; i++)
printf("dog[%d]: '%c'\n", i, dog_letter(i));
return 0;
}
...
With -m64:
...
$ gcc -Wall -o mpx-out-of-bounds mpx-out-of-bounds.c -mmpx
-fcheck-pointer-bounds
$ ./mpx-out-of-bounds 10
dog[0]: 'd'
dog[1]: 'o'
dog[2]: 'g'
dog[3]: ''
Saw a #BR! status 1 at 0x400634
dog[4]: 's'
Saw a #BR! status 1 at 0x400634
dog[5]: 'e'
Saw a #BR! status 1 at 0x400634
dog[6]: 'c'
Saw a #BR! status 1 at 0x400634
dog[7]: 'r'
Saw a #BR! status 1 at 0x400634
dog[8]: '3'
Saw a #BR! status 1 at 0x400634
dog[9]: 't'
...
With -m32:
...
$ gcc -m32 -Wall -o mpx-out-of-bounds mpx-out-of-bounds.c -mmpx
-fcheck-pointer-bounds
$ ./mpx-out-of-bounds 10 2>&1 | more
Saw a #BR! status 4157798670 at 0x8048492
Unexpected status with bound exception: 4157798670
Saw a #BR! status 4157798670 at 0x8048492
Unexpected status with bound exception: 4157798670
Saw a #BR! status 4157798670 at 0x8048492
Unexpected status with bound exception: 4157798670
Saw a #BR! status 4157798670 at 0x8048492
Unexpected status with bound exception: 4157798670
Saw a #BR! status 4157798670 at 0x8048492
Unexpected status with bound exception: 4157798670
Saw a #BR! status 4157798670 at 0x8048492
Unexpected status with bound exception: 4157798670
Saw a #BR! status 4157798670 at 0x8048492
Unexpected status with bound exception: 4157798670
Saw a #BR! status 4157798670 at 0x8048492
Unexpected status with bound exception: 4157798670
Saw a #BR! status 4157798670 at 0x8048492
Unexpected status with bound exception: 4157798670
Saw a #BR! status 4157798670 at 0x8048492
Unexpected status with bound exception: 4157798670
Saw a #BR! status 4157798670 at 0x8048492
Unexpected status with bound exception: 4157798670
<etc>
...
From what I understand, the problem starts the moment a first mpx instruction
is executed, which should trigger an exception that is caught by the kernel to
allocate some related tables.
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