[asterisk-bugs] [JIRA] (ASTERISK-28294) Segmentation Fault on strchr

[Salah Ahmed (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-28294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=246303#comment-246303 ] 

Salah Ahmed commented on ASTERISK-28294:
----------------------------------------

Hello,

It seems something happened on that particular machine, This version of asterisk running all other machines without any issue with identical configuration. And we could not reproduce this issue on our local environment. So, this could be a hardware issue. Thanks for your responses.

Thanks

> Segmentation Fault on strchr 
> -----------------------------
>
>                 Key: ASTERISK-28294
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-28294
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Core/Logging
>    Affects Versions: 13.24.1
>            Reporter: Salah Ahmed
>            Assignee: Salah Ahmed
>            Severity: Minor
>              Labels: fax
>
> Hi,
> Recently we have experiencing a crash on our system. gdb core dump report following,
> {code}
> #1  0x000000000053a47f in logger_strip_verbose_magic (message=0x7feda0004302 "", level=-1) at logger.c:1366
>         begin = 0x7feda0032000 <error: Cannot access memory at address 0x7feda0032000>
>         end = 0x7feda0031fff ""
>         stripped_message = 0x7fee18000a80 " (keepalive-fax, keepalive-fax, 7) exited non-zero on 'PJSIP/ser02-000001b1'\n\020Feb 14 20:04:36\bVERBOSE\006pbx.c\016__ast_pbx_run5\340N\240\355\177\027\027\065\320O\240\355\177\200I\240\355\177Q\001x\240\355\177\240\025\240\355\177\350G\240\355\177&l\376zpd\300@\240\355\177\377\377\377\377\300\004\064SUCCESS@(\240\355\177\261\240\t\240\355\177\340I\240"...
>         dst = 0x7fee1800480b ""
>         magic = 0 '\000'
>         __PRETTY_FUNCTION__ = "logger_strip_verbose_magic"
> #2  0x000000000053a5d2 in logger_print_normal (logmsg=0x7feda0004280) at logger.c:1400
>         chan = 0x0
>         buf = "Executing [keepalive-fax at keepalive-fax:7] ExecIf(\"PJSIP/cnhk1ser02-000001b1\", \"1?Busy()\") in new stack\n\000ive_handler\") in new stack\n\000RE ms.hostname LIKE ?    AND ms.service = vcc    AND IFNULL(ms.force"...
>         v = 0x0
>         tmpmsg = 0x7feda0004298 "\340B"
>         level = -1
>         __PRETTY_FUNCTION__ = "logger_print_normal"
> #3  0x000000000053b9e4 in logger_thread (data=0x0) at logger.c:1617
>         next = 0x0
>         msg = 0x7feda0004280
>         __PRETTY_FUNCTION__ = "logger_thread"
> #4  0x00000000005f6640 in dummy_start (data=0x2d76570) at utils.c:1238
>         __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {0, 5944777430901416190, 0, 140660921573472, 0, 140660859598592, 5944777430876250366, -5954807578999037698}, 
>               __mask_was_saved = 0}}, __pad = {0x7fee2891eef0, 0x0, 0x0, 0x0}}
>         __cancel_routine = 0x450f0b <ast_unregister_thread>
>         __cancel_arg = 0x7fee2891f700
>         __not_first_call = 0
>         ret = 0x0
>         a = {start_routine = 0x53b821 <logger_thread>, data = 0x0, name = 0x2d766d0 "logger_thread        started at [ 1705] logger.c init_logger()"}
> #5  0x00007fee2a71f064 in start_thread (arg=0x7fee2891f700) at pthread_create.c:309
>         __res = <optimized out>
>         pd = 0x7fee2891f700
>         now = <optimized out>
>         unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140660859598592, -5954806884488486658, 0, 140660921573472, 0, 140660859598592, 5944777430903513342, 5944771658510852350}, 
>               mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
>         not_first_call = <optimized out>
>         pagesize_m1 = <optimized out>
>         sp = <optimized out>
>         freesize = <optimized out>
>         __PRETTY_FUNCTION__ = "start_thread"
> #6  0x00007fee29a0762d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
> {code}
> From logger.c file,
> {code}
>         do {
>                 end = strchr(begin, magic);
> 		if (end) {
>                         size_t len = end - begin;
>                         memcpy(dst, begin, len);
>                         begin = end + 1;
> 			dst += len;
>                 } else {
>                         strcpy(dst, begin); /* safe */
>                         break;
>                 }
> 	} while (1);
> {code}
> It seems, If magic is 0 then there have possibility for this crash.
> Thank You,



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