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DescriptionBranislav Náter
2012-07-04 12:09:56 UTC
Description of problem:
Running sa -u (print also user id) command cause Segmentation fault on i386 and s390x archs and produce incorect output on x86_64.
Version-Release number of selected component (if applicable):
psacct-6.3.2-63.el6_3.2
How reproducible:
always
Steps to Reproduce:
1. run "sa -u"
Actual results on different archs:
ppc64: root 0.00 cpu 62k mem accton
x86_64: 13179672 0.00 cpu 979k mem accton
i386: Segmentation fault
s390x: Segmentation fault
Expected results:
root 0.00 cpu 62k mem accton
Additional info:
Output seems to be correct only on ppc64 architecture.
Traceback from i386:
(gdb) t a a bt
Thread 1 (process 14151):
#0 0x0804a3f4 in parse_acct_entries () at sa.c:1254
#1 0x0804abea in main (argc=2, argv=0xbffff364) at sa.c:585
Traceback from s390x:
(gdb) t a a bt
Thread 1 (process 8385):
#0 0x0000000080002b96 in parse_acct_entries () at sa.c:1254
#1 0x0000000080003312 in main (argc=<value optimized out>, argv=<value optimized out>) at sa.c:585
Some parts of the code are really very strange ...
----------------------------------------------------
#if __BYTE_ORDER == __BIG_ENDIAN
# define ACCT_BYTEORDER 0x80 /* Accounting file is big endian. */
#else
# define ACCT_BYTEORDER 0x00 /* Accounting file is little endian. */
#endif
...
...
if ((version % ACCT_BYTEORDER) != 3) {
----------------------------------------------------
Anything modulo 0 must throw SIGFPE ...
Fortunately the structure seems to be BIG ENDIAN even on LITTLE_ENDIAN architectures ... this has been redesigned in the new upstream version.
It seems I've found the issue. The ac_uid field needs to be read from the rec_v3 variable in case of acct_v3 structures. The acct structure version detection is a bit nonsense, but it doesn't cause the trouble. It was a human factor ... a cut'n'paste issue. Gonna test that on other architectures.