Re: Bug#859120: ausearch -i segfault

Re: Bug#859120: ausearch -i segfault

[Laurent Bigonville]

Le 30/03/17 à 15:56, cgzones a écrit :

Hi,

I just received the following bug in debian:

> ausearch segfaults on the following input in interpret mode:
>
> /sbin/ausearch -i --input file
>
> type=AVC msg=audit(1490829425.686:121): avc:  denied  { bind } for
> pid=1034 comm="darkstat" scontext=system_u:system_r:darkstat_t:s0
> tcontext=system_u:system_r:darkstat_t:s0 tclass=packet_socket
> permissive=0
> type=SYSCALL msg=audit(1490829425.686:121): arch=c000003e syscall=49
> success=no exit=-13 a0=3 a1=7ffce52e04b0 a2=14 a3=373 items=0
> ppid=1033 pid=1034 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0
> egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="darkstat"
> exe="/usr/sbin/darkstat" subj=system_u:system_r:darkstat_t:s0
> key=(null)
> type=SOCKADDR msg=audit(1490829425.686:121):
> saddr=1100000302000000000000000000000000000000
> type=PROCTITLE msg=audit(1490829425.686:121):
> proctitle=2F7573722F7362696E2F6461726B73746174002D6900656E70307333002D2D6368726F6F74002F7661722F6C69622F6461726B73746174002D2D70696466696C65002F7661722F72756E2F6461726B737461742E706964002D2D696D706F7274006461726B737461742E6462002D2D6578706F7274006461726B737461742E64

The user is running version 2.6.7 (the version that will be shipped in 
the upcoming stable release).

I can actually reproduce the issue with the following one line:

type=SOCKADDR msg=audit(1490829425.686:121): 
saddr=1100000302000000000000000000000000000000

I got the following stacktrace:

#0  strlen () at ../sysdeps/x86_64/strlen.S:106
#1  0x00007ffff79a04da in auparse_do_interpretation (type=type@entry=9, 
id=id@entry=0x7fffffffde00) at ../../../auparse/interpret.c:2917
#2  0x000055555555d3f1 in interpret (rtype=1306, comma=0, 
val=0x555555771a93 "1100000302", '0' <repeats 30 times>, name=<optimized 
out>) at ../../../src/ausearch-report.c:359
#3  output_interpreted_node (n=0x555555771bd0, e=e@entry=0x555555771ae8) 
at ../../../src/ausearch-report.c:296
#4  0x000055555555d9e3 in output_interpreted (l=0x555555771ad0) at 
../../../src/ausearch-report.c:151
#5  output_record (l=0x555555771ad0) at ../../../src/ausearch-report.c:80
#6  0x0000555555557cac in process_log_fd () at ../../../src/ausearch.c:445
#7  0x000055555555782b in main (argc=4, argv=0x7fffffffe098) at 
../../../src/ausearch.c:140

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Re: Bug#859120: ausearch -i segfault

[Steve Grubb]

Hello,

On Thursday, March 30, 2017 12:27:29 PM EDT Laurent Bigonville wrote:
> Le 30/03/17 à 15:56, cgzones a écrit :
> I just received the following bug in debian:
> > ausearch segfaults on the following input in interpret mode:
> > 
> > /sbin/ausearch -i --input file
> > 
> > type=AVC msg=audit(1490829425.686:121): avc:  denied  { bind } for
> > pid=1034 comm="darkstat" scontext=system_u:system_r:darkstat_t:s0
> > tcontext=system_u:system_r:darkstat_t:s0 tclass=packet_socket
> > permissive=0
> > type=SYSCALL msg=audit(1490829425.686:121): arch=c000003e syscall=49
> > success=no exit=-13 a0=3 a1=7ffce52e04b0 a2=14 a3=373 items=0
> > ppid=1033 pid=1034 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0
> > egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="darkstat"
> > exe="/usr/sbin/darkstat" subj=system_u:system_r:darkstat_t:s0
> > key=(null)
> > type=SOCKADDR msg=audit(1490829425.686:121):
> > saddr=1100000302000000000000000000000000000000
> > type=PROCTITLE msg=audit(1490829425.686:121):
> > proctitle=2F7573722F7362696E2F6461726B73746174002D6900656E70307333002D2D63
> > 68726F6F74002F7661722F6C69622F6461726B73746174002D2D70696466696C65002F7661
> > 722F72756E2F6461726B737461742E706964002D2D696D706F7274006461726B737461742E
> > 6462002D2D6578706F7274006461726B737461742E64
> The user is running version 2.6.7 (the version that will be shipped in
> the upcoming stable release).

I just committed the fix for this. You can find it is here:
https://github.com/linux-audit/audit-userspace/commit/f85cb62f10644e347c16541c8aa988219a3b3501

Thanks for reporting it.

-Steve

> I can actually reproduce the issue with the following one line:
> 
> type=SOCKADDR msg=audit(1490829425.686:121):
> saddr=1100000302000000000000000000000000000000
> 
> I got the following stacktrace:
> 
> #0  strlen () at ../sysdeps/x86_64/strlen.S:106
> #1  0x00007ffff79a04da in auparse_do_interpretation (type=type@entry=9,
> id=id@entry=0x7fffffffde00) at ../../../auparse/interpret.c:2917
> #2  0x000055555555d3f1 in interpret (rtype=1306, comma=0,
> val=0x555555771a93 "1100000302", '0' <repeats 30 times>, name=<optimized
> out>) at ../../../src/ausearch-report.c:359
> #3  output_interpreted_node (n=0x555555771bd0, e=e@entry=0x555555771ae8)
> at ../../../src/ausearch-report.c:296
> #4  0x000055555555d9e3 in output_interpreted (l=0x555555771ad0) at
> ../../../src/ausearch-report.c:151
> #5  output_record (l=0x555555771ad0) at ../../../src/ausearch-report.c:80
> #6  0x0000555555557cac in process_log_fd () at ../../../src/ausearch.c:445
> #7  0x000055555555782b in main (argc=4, argv=0x7fffffffe098) at
> ../../../src/ausearch.c:140
> 
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