diff options
author | Roland McGrath <roland@redhat.com> | 2009-02-06 18:15:18 -0800 |
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committer | Roland McGrath <roland@redhat.com> | 2009-02-06 18:22:29 -0800 |
commit | c09249f8d1b84344eca882547afdbffee8c09d14 (patch) | |
tree | 9c652c6aaec01f25f15d451b0f0e8009a8a8d530 /include/math-emu/op-4.h | |
parent | 6cec50838ed04a9833fb5549f698d3756bbe7e72 (diff) |
x86-64: fix int $0x80 -ENOSYS return
One of my past fixes to this code introduced a different new bug.
When using 32-bit "int $0x80" entry for a bogus syscall number,
the return value is not correctly set to -ENOSYS. This only happens
when neither syscall-audit nor syscall tracing is enabled (i.e., never
seen if auditd ever started). Test program:
/* gcc -o int80-badsys -m32 -g int80-badsys.c
Run on x86-64 kernel.
Note to reproduce the bug you need auditd never to have started. */
#include <errno.h>
#include <stdio.h>
int
main (void)
{
long res;
asm ("int $0x80" : "=a" (res) : "0" (99999));
printf ("bad syscall returns %ld\n", res);
return res != -ENOSYS;
}
The fix makes the int $0x80 path match the sysenter and syscall paths.
Reported-by: Dmitry V. Levin <ldv@altlinux.org>
Signed-off-by: Roland McGrath <roland@redhat.com>
Diffstat (limited to 'include/math-emu/op-4.h')
0 files changed, 0 insertions, 0 deletions