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[2002-03-06 11:34 UTC] a dot mayrhofer at kpnqwest dot at
While upgrading PHP from 4.0.3pl1 to 4.1.2 i noticed crashes related to long file names, espacially when running under safe_mode.
The problem can be reproduced using the following one liner:
<?
sleep(20);
fopen("xxxxxxxxxxxxxxxxxx..... [very long file name, 1000 characters] ...xxxxxxxxxx", "r");
?>
Please note that for obvious reasons the filename has been shortened in the example above, the "sleep" statement has been added for debugging purposes...
Process trace of PHP:
sigprocmask(SIG_UNBLOCK, 0xEFFFE5B8, 0x00000000) = 0
sigaction(SIGALRM, 0xEFFFE518, 0x00000000) = 0
resolvepath("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", 0xEFFFE078, 1024) Err#78 ENAMETOOLONG
Incurred fault #6, FLTBOUNDS %pc = 0xEF3A4644
siginfo: SIGSEGV SEGV_MAPERR addr=0xF0000000
Received signal #11, SIGSEGV [default]
siginfo: SIGSEGV SEGV_MAPERR addr=0xF0000000
*** process killed ***
gdb output:
(gdb) b php_fopen_wrapper
Breakpoint 1 at 0x2f3b8: file fopen_wrappers.c, line 245.
(gdb) cont
Continuing.
Breakpoint 1, php_fopen_wrapper (path=0x1cb060 'x' <repeats 200 times>...,
mode=0x1c71e8 "r", options=4, issock=0xefffe660, socketd=0x72,
opened_path=0x0) at fopen_wrappers.c:245
fopen_wrappers.c:245: No such file or directory.
(gdb)
Continuing.
Program received signal SIGSEGV, Segmentation fault.
0xef3a4644 in strcpy ()
(gdb) bt
#0 0xef3a4644 in strcpy ()
#1 0xef3cbe18 in _realpath ()
#2 0xf8090 in php_checkuid (filename=0x1cb060 'x' <repeats 200 times>...,
fopen_mode=0x1c71e8 "r", mode=0) at safe_mode.c:79
#3 0x2fcf8 in php_fopen_url_wrapper (
path=0x78787878 <Address 0x78787878 out of bounds>,
mode=0x78787878 <Address 0x78787878 out of bounds>, options=2021161080,
issock=0x78787878, socketd=0x78787878, opened_path=0x78787878)
at fopen_wrappers.c:558
Cannot access memory at address 0x787878b0.
(gdb) (gdb) b php_fopen_wrapper
Breakpoint 1 at 0x2f3b8: file fopen_wrappers.c, line 245.
(gdb) cont
Continuing.
Breakpoint 1, php_fopen_wrapper (path=0x1cb060 'x' <repeats 200 times>...,
mode=0x1c71e8 "r", options=4, issock=0xefffe660, socketd=0x72,
opened_path=0x0) at fopen_wrappers.c:245
fopen_wrappers.c:245: No such file or directory.
(gdb)
Continuing.
Program received signal SIGSEGV, Segmentation fault.
0xef3a4644 in strcpy ()
(gdb) bt
#0 0xef3a4644 in strcpy ()
#1 0xef3cbe18 in _realpath ()
#2 0xf8090 in php_checkuid (filename=0x1cb060 'x' <repeats 200 times>...,
fopen_mode=0x1c71e8 "r", mode=0) at safe_mode.c:79
#3 0x2fcf8 in php_fopen_url_wrapper (
path=0x78787878 <Address 0x78787878 out of bounds>,
mode=0x78787878 <Address 0x78787878 out of bounds>, options=2021161080,
issock=0x78787878, socketd=0x78787878, opened_path=0x78787878)
at fopen_wrappers.c:558
Cannot access memory at address 0x787878b0.
(gdb)
Other occurrences with different path names and include path lead to Bus Errors...
If you need further information, don't hesitate to contact me.
Alex Mayrhofer
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Last updated: Sun Nov 30 20:00:01 2025 UTC |
Happens still with latest CVS snapshot (200203070000), please see gdb debugging session below: (gdb) run crash.php The program being debugged has been started already. Start it from the beginning? (y or n) y Starting program: /src/webstuff/php4-200203070000/php crash.php warning: Unable to find dynamic linker breakpoint function. warning: GDB will be unable to debug shared library initializers warning: and track explicitly loaded dynamic code. Breakpoint 1, php_checkuid (filename=0x1d2180 'x' <repeats 200 times>..., fopen_mode=0x1c9278 "r", mode=4) at safe_mode.c:50 50 long uid=0L, gid=0L, duid=0L, dgid=0L; (gdb) step 55 if (!filename) { (gdb) 59 if (fopen_mode) { (gdb) 60 if (fopen_mode[0] == 'r') { (gdb) 71 if (!strncasecmp(filename,"http://", 7) || !strncasecmp(filename,"ftp://", 6)) { (gdb) print filename $7 = 0x1d2180 'x' <repeats 200 times>... (gdb) $8 = 0x1d2180 'x' <repeats 200 times>... (gdb) $9 = 0x1d2180 'x' <repeats 200 times>... (gdb) step 78 if (mode != CHECKUID_ALLOW_ONLY_DIR) { (gdb) 79 VCWD_REALPATH(filename, path); (gdb) 80 ret = VCWD_STAT(path, &sb); (gdb) 81 if (ret < 0) { (gdb) 82 if (mode == CHECKUID_DISALLOW_FILE_NOT_EXISTS) {(gdb) 83 php_error(E_WARNING, "Unable to access %s", filename); (gdb) print filename $10 = 0x1d2180 'x' <repeats 200 times>... (gdb) $11 = 0x1d2180 'x' <repeats 200 times>... (gdb) step zend_error (type=2, format=<error type>) at zend.c:642 642 switch (type) { (gdb) 657 if (zend_is_compiling(TSRMLS_C)) { (gdb) zend_is_compiling () at zend_compile.c:147 147 return CG(in_compilation); (gdb) zend_is_executing () at zend_execute_API.c:263 263 return EG(in_execution); (gdb) zend_error (type=2, format=<error type>) at zend.c:661 661 error_filename = zend_get_executed_filename(TSRMLS_C); (gdb) print error_filename $12 = <incomplete type> (gdb) step zend_get_executed_filename () at zend_execute_API.c:243 243 if (EG(active_op_array)) { (gdb) print active_op_array No symbol "active_op_array" in current context. (gdb) step 244 return EG(active_op_array)->filename; (gdb) print active_op_array No symbol "active_op_array" in current context. (gdb) print EG(active_op_array)->filename No symbol "EG" in current context. (gdb) step zend_error (type=2, format=<error type>) at zend.c:662 662 error_lineno = zend_get_executed_lineno(TSRMLS_C); (gdb) print error_filename $13 = <incomplete type> (gdb) $14 = <incomplete type> (gdb) step zend_get_executed_lineno () at zend_execute_API.c:253 253 if (EG(opline_ptr)) { (gdb) print opline_ptr No symbol "opline_ptr" in current context. (gdb) step 254 return active_opline->lineno; (gdb) print filename No symbol "filename" in current context. (gdb) step Program received signal SIGSEGV, Segmentation fault. zend_get_executed_lineno () at zend_execute_API.c:254 254 return active_opline->lineno; (gdb) bt #0 zend_get_executed_lineno () at zend_execute_API.c:254 #1 0xec1bc in zend_error (type=2, format=<error type>) at zend.c:662 #2 0xf5d30 in php_checkuid (filename=0x1d2180 'x' <repeats 200 times>..., fopen_mode=0xefffe118 'x' <repeats 200 times>..., mode=0) at safe_mode.c:83 #3 0x31de4 in php_fopen_url_wrapper (path=<error type>, mode=<error type>, options=2021161080, issock=<incomplete type>, socketd=<incomplete type>, opened_path=<error type>) at fopen_wrappers.c:582 Cannot access memory at address 0x787878b0. (gdb)