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Bug #45079 --with-config-file-path causes segmentation fault
Submitted: 2008-05-23 12:40 UTC Modified: 2008-07-08 14:45 UTC
From: m dot kurzyna at crystalpoint dot pl Assigned: fb-req-jani (profile)
Status: Closed Package: Reproducible crash
PHP Version: 5.3CVS-2008-05-23 (snap) OS: Linux
Private report: No CVE-ID: None
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 [2008-05-23 12:40 UTC] m dot kurzyna at crystalpoint dot pl 
Description:
------------
Configuring build --with-config-file-path=/etc/php causes 
segmentation fault when invoking binary (both CLI and CGI).


Reproduce code:
---------------
./configure --with-config-file-path=/etc/php
make
./sapi/cli/php

Actual result:
--------------
[builder@builder-th64 n1]$ ./sapi/cgi/php-cgi
Segmentation fault

A strace follows:

[...]
open("/etc/php/php.ini", O_RDONLY)      = 3
lstat("/etc", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/etc/php", {st_mode=S_IFDIR|0755, st_size=52, ...}) = 0
lstat("/etc/php/php.ini", {st_mode=S_IFREG|0644, 
st_size=42387, ...}) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fffe8ff0d60) = -1 ENOTTY 
(Inappropriate ioctl for device)
fstat(3, {st_mode=S_IFREG|0644, st_size=42387, ...}) = 0
mmap(NULL, 42403, PROT_READ, MAP_PRIVATE, 3, 0) = 0x2b4dc1b13000
munmap(0x2b4dc1b13000, 42387)           = 0
close(3)                                = 0
mmap(NULL, 323584, PROT_READ|PROT_WRITE, MAP_PRIVATE|
MAP_ANONYMOUS, -1, 0) = 0x2b4dc1b13000
brk(0xa42000)                           = 0xa42000
brk(0xa63000)                           = 0xa63000
brk(0xa84000)                           = 0xa84000
futex(0x2b4dc2d11ae0, FUTEX_WAKE_PRIVATE, 2147483647) = 0
brk(0xaa5000)                           = 0xaa5000
brk(0xac6000)                           = 0xac6000
brk(0xae7000)                           = 0xae7000
brk(0xb08000)                           = 0xb08000
brk(0xb29000)                           = 0xb29000
open("/etc/php/browscap.ini", O_RDONLY) = 3
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fffe8ff1da0) = -1 ENOTTY 
(Inappropriate ioctl for device)
fstat(3, {st_mode=S_IFREG|0644, st_size=319838, ...}) = 0
mmap(NULL, 319854, PROT_READ, MAP_PRIVATE, 3, 0) = 0x2b4dc1b62000
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++

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 [2008-05-25 21:58 UTC] m dot kurzyna at crystalpoint dot pl 
Core was generated by `./sapi/cli/php'.
Program terminated with signal 11, Segmentation fault.
[New process 20491]
#0  0x00000000006f76f4 in ini_lex (ini_lval=0x7fffe7d51180) at /home/users/builder/src/php/n2/Zend/zend_ini_scanner.c:1673
1673                    yytext[yyleng] = 0;
(gdb) bt
#0  0x00000000006f76f4 in ini_lex (ini_lval=0x7fffe7d51180) at /home/users/builder/src/php/n2/Zend/zend_ini_scanner.c:1673
#1  0x00000000006f43be in ini_parse () at /home/users/builder/src/php/n2/Zend/zend_ini_parser.c:1557
#2  0x00000000006f3c36 in zend_parse_ini_file (fh=0x7fffe7d512c0, unbuffered_errors=1 '\001', scanner_mode=1,
    ini_parser_cb=0x620458 <php_browscap_parser_cb>, arg=0xb2cec0)
    at /home/users/builder/src/php/n2/Zend/zend_ini_parser.c:319
#3  0x0000000000620aba in zm_startup_browscap (type=1, module_number=7)
    at /home/users/builder/src/php/n2/ext/standard/browscap.c:198
#4  0x0000000000618005 in zm_startup_basic (type=1, module_number=7)
    at /home/users/builder/src/php/n2/ext/standard/basic_functions.c:4003
#5  0x000000000072b711 in zend_startup_module_ex (module=0xb55eb0) at /home/users/builder/src/php/n2/Zend/zend_API.c:1585
#6  0x0000000000733d00 in zend_hash_apply (ht=0xb335a0, apply_func=0x72b568 <zend_startup_module_ex>)
    at /home/users/builder/src/php/n2/Zend/zend_hash.c:673
#7  0x000000000072b8f2 in zend_startup_modules () at /home/users/builder/src/php/n2/Zend/zend_API.c:1634
#8  0x00000000006b1739 in php_module_startup (sf=0xb2b480, additional_modules=0x0, num_additional_modules=0)
    at /home/users/builder/src/php/n2/main/main.c:1898
#9  0x00000000007c326e in php_cli_startup (sapi_module=0xb2b480) at /home/users/builder/src/php/n2/sapi/cli/php_cli.c:358
#10 0x00000000007c3ffb in main (argc=1, argv=0x7fffe7d51938) at /home/users/builder/src/php/n2/sapi/cli/php_cli.c:716
 [2008-05-26 20:11 UTC] jani@php.net 
Why do you actually have browscap.ini in that directory anyway..? That sounds like a very bad idea to me, considering it will get loaded as "normal" partial php.ini file. Of course it shouldn't cause a crash though. :)
 [2008-05-26 20:43 UTC] m dot kurzyna at crystalpoint dot pl 
As for the location - it seems convenient. Dunno if loading it with the rest of .ini is a good or bad thing - personally I don't see disadvantages of this except for having to parse one more file and thus startup performance loss.

This however is irrelevant. I moved browsecap.ini to /tmp and set browsecap option to new location - it still crashes. However when it can't find the file it doesn't so it's something specific to this file that causes the crash. 

I've managed to isolate basic test case: it's using quotation for  values:

option="value" 

crashes, where 

option=value 

doesn't. This isn't true for configuration ini file - using quotations has no crash effect as far as I tested.
 [2008-07-06 11:46 UTC] jani@php.net 
Please try using this CVS snapshot:

  http://snaps.php.net/php5.3-latest.tar.gz

And provide new backtrace generated with that snapshot.
 [2008-07-08 11:35 UTC] m dot kurzyna at crystalpoint dot pl 
Just tried with 2008.07.08 08:30 snap - seems to work fine with values both quoted and not. Thanks for the fix.
 [2008-07-08 14:45 UTC] johannes@php.net 
Closing then.
 
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