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Bug #70782 null ptr deref and segfault (zend_get_class_fetch_type (zend_compile.c:1322))
Submitted: 2015-10-24 20:19 UTC Modified: -
From: brian dot carpenter at gmail dot com Assigned:
Status: Closed Package: Reproducible crash
PHP Version: 7.0Git-2015-10-24 (Git) OS: Debian 7 x64
Private report: No CVE-ID: None
 [2015-10-24 20:19 UTC] brian dot carpenter at gmail dot com
Description:
------------
While fuzzing PHP 7.1.0-dev (cli) (built: Oct 22 2015 08:22:38) ( NTS ) with American Fuzzy Lop, I was able to trigger a null ptr deref and segfault.

Test script:
---------------
<?for(;;){?><?(-0)::$h;}

Expected result:
----------------
No crash. For example, PHP 5.4.45-0+deb7u1 fails with the following error:

PHP Parse error:  syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM) in /home/geeknik/php-tmp/out/crashes/test0 on line 1

Actual result:
--------------
valgrind -q ~/php-src/sapi/cli/php test0
==7684== Conditional jump or move depends on uninitialised value(s)
==7684==    at 0x15F013E: zend_hash_find (zend_hash.c:439)
==7684==    by 0x17157BC: zend_do_inheritance (zend_inheritance.c:602)
==7684==    by 0x158D5DA: zend_register_internal_class_ex (zend_API.c:2662)
==7684==    by 0x164CEAE: zend_register_default_exception (zend_exceptions.c:862)
==7684==    by 0x17059F5: zend_register_default_classes (zend_default_classes.c:34)
==7684==    by 0x161A939: zm_startup_core (zend_builtin_functions.c:340)
==7684==    by 0x157E797: zend_startup_module_ex (zend_API.c:1829)
==7684==    by 0x15DB519: zend_hash_apply (zend_hash.c:1460)
==7684==    by 0x1583225: zend_startup_modules (zend_API.c:1955)
==7684==    by 0x1314AD9: php_module_startup (main.c:2194)
==7684==    by 0x18F0C54: php_cli_startup (php_cli.c:423)
==7684==    by 0x468257: main (php_cli.c:1325)
==7684==
==7684== Conditional jump or move depends on uninitialised value(s)
==7684==    at 0x15F04DD: zend_hash_find (zend_hash.c:439)
==7684==    by 0x17157BC: zend_do_inheritance (zend_inheritance.c:602)
==7684==    by 0x158D5DA: zend_register_internal_class_ex (zend_API.c:2662)
==7684==    by 0x164CEAE: zend_register_default_exception (zend_exceptions.c:862)
==7684==    by 0x17059F5: zend_register_default_classes (zend_default_classes.c:34)
==7684==    by 0x161A939: zm_startup_core (zend_builtin_functions.c:340)
==7684==    by 0x157E797: zend_startup_module_ex (zend_API.c:1829)
==7684==    by 0x15DB519: zend_hash_apply (zend_hash.c:1460)
==7684==    by 0x1583225: zend_startup_modules (zend_API.c:1955)
==7684==    by 0x1314AD9: php_module_startup (main.c:2194)
==7684==    by 0x18F0C54: php_cli_startup (php_cli.c:423)
==7684==    by 0x468257: main (php_cli.c:1325)
==7684==
==7684== Conditional jump or move depends on uninitialised value(s)
==7684==    at 0x15F013E: zend_hash_find (zend_hash.c:439)
==7684==    by 0x17157BC: zend_do_inheritance (zend_inheritance.c:602)
==7684==    by 0x158D5DA: zend_register_internal_class_ex (zend_API.c:2662)
==7684==    by 0x164D32D: zend_register_default_exception (zend_exceptions.c:880)
==7684==    by 0x17059F5: zend_register_default_classes (zend_default_classes.c:34)
==7684==    by 0x161A939: zm_startup_core (zend_builtin_functions.c:340)
==7684==    by 0x157E797: zend_startup_module_ex (zend_API.c:1829)
==7684==    by 0x15DB519: zend_hash_apply (zend_hash.c:1460)
==7684==    by 0x1583225: zend_startup_modules (zend_API.c:1955)
==7684==    by 0x1314AD9: php_module_startup (main.c:2194)
==7684==    by 0x18F0C54: php_cli_startup (php_cli.c:423)
==7684==    by 0x468257: main (php_cli.c:1325)
==7684==
==7684== Conditional jump or move depends on uninitialised value(s)
==7684==    at 0x15F04DD: zend_hash_find (zend_hash.c:439)
==7684==    by 0x17157BC: zend_do_inheritance (zend_inheritance.c:602)
==7684==    by 0x158D5DA: zend_register_internal_class_ex (zend_API.c:2662)
==7684==    by 0x164D32D: zend_register_default_exception (zend_exceptions.c:880)
==7684==    by 0x17059F5: zend_register_default_classes (zend_default_classes.c:34)
==7684==    by 0x161A939: zm_startup_core (zend_builtin_functions.c:340)
==7684==    by 0x157E797: zend_startup_module_ex (zend_API.c:1829)
==7684==    by 0x15DB519: zend_hash_apply (zend_hash.c:1460)
==7684==    by 0x1583225: zend_startup_modules (zend_API.c:1955)
==7684==    by 0x1314AD9: php_module_startup (main.c:2194)
==7684==    by 0x18F0C54: php_cli_startup (php_cli.c:423)
==7684==    by 0x468257: main (php_cli.c:1325)
==7684==
==7684== Conditional jump or move depends on uninitialised value(s)
==7684==    at 0x15F013E: zend_hash_find (zend_hash.c:439)
==7684==    by 0x17157BC: zend_do_inheritance (zend_inheritance.c:602)
==7684==    by 0x158D5DA: zend_register_internal_class_ex (zend_API.c:2662)
==7684==    by 0x164D4EF: zend_register_default_exception (zend_exceptions.c:884)
==7684==    by 0x17059F5: zend_register_default_classes (zend_default_classes.c:34)
==7684==    by 0x161A939: zm_startup_core (zend_builtin_functions.c:340)
==7684==    by 0x157E797: zend_startup_module_ex (zend_API.c:1829)
==7684==    by 0x15DB519: zend_hash_apply (zend_hash.c:1460)
==7684==    by 0x1583225: zend_startup_modules (zend_API.c:1955)
==7684==    by 0x1314AD9: php_module_startup (main.c:2194)
==7684==    by 0x18F0C54: php_cli_startup (php_cli.c:423)
==7684==    by 0x468257: main (php_cli.c:1325)
==7684==
==7684== Conditional jump or move depends on uninitialised value(s)
==7684==    at 0x15F04DD: zend_hash_find (zend_hash.c:439)
==7684==    by 0x17157BC: zend_do_inheritance (zend_inheritance.c:602)
==7684==    by 0x158D5DA: zend_register_internal_class_ex (zend_API.c:2662)
==7684==    by 0x164D4EF: zend_register_default_exception (zend_exceptions.c:884)
==7684==    by 0x17059F5: zend_register_default_classes (zend_default_classes.c:34)
==7684==    by 0x161A939: zm_startup_core (zend_builtin_functions.c:340)
==7684==    by 0x157E797: zend_startup_module_ex (zend_API.c:1829)
==7684==    by 0x15DB519: zend_hash_apply (zend_hash.c:1460)
==7684==    by 0x1583225: zend_startup_modules (zend_API.c:1955)
==7684==    by 0x1314AD9: php_module_startup (main.c:2194)
==7684==    by 0x18F0C54: php_cli_startup (php_cli.c:423)
==7684==    by 0x468257: main (php_cli.c:1325)
==7684==
==7684== Conditional jump or move depends on uninitialised value(s)
==7684==    at 0x15F013E: zend_hash_find (zend_hash.c:439)
==7684==    by 0x17157BC: zend_do_inheritance (zend_inheritance.c:602)
==7684==    by 0x158D5DA: zend_register_internal_class_ex (zend_API.c:2662)
==7684==    by 0x164D6BE: zend_register_default_exception (zend_exceptions.c:888)
==7684==    by 0x17059F5: zend_register_default_classes (zend_default_classes.c:34)
==7684==    by 0x161A939: zm_startup_core (zend_builtin_functions.c:340)
==7684==    by 0x157E797: zend_startup_module_ex (zend_API.c:1829)
==7684==    by 0x15DB519: zend_hash_apply (zend_hash.c:1460)
==7684==    by 0x1583225: zend_startup_modules (zend_API.c:1955)
==7684==    by 0x1314AD9: php_module_startup (main.c:2194)
==7684==    by 0x18F0C54: php_cli_startup (php_cli.c:423)
==7684==    by 0x468257: main (php_cli.c:1325)
==7684==
==7684== Conditional jump or move depends on uninitialised value(s)
==7684==    at 0x15F04DD: zend_hash_find (zend_hash.c:439)
==7684==    by 0x17157BC: zend_do_inheritance (zend_inheritance.c:602)
==7684==    by 0x158D5DA: zend_register_internal_class_ex (zend_API.c:2662)
==7684==    by 0x164D6BE: zend_register_default_exception (zend_exceptions.c:888)
==7684==    by 0x17059F5: zend_register_default_classes (zend_default_classes.c:34)
==7684==    by 0x161A939: zm_startup_core (zend_builtin_functions.c:340)
==7684==    by 0x157E797: zend_startup_module_ex (zend_API.c:1829)
==7684==    by 0x15DB519: zend_hash_apply (zend_hash.c:1460)
==7684==    by 0x1583225: zend_startup_modules (zend_API.c:1955)
==7684==    by 0x1314AD9: php_module_startup (main.c:2194)
==7684==    by 0x18F0C54: php_cli_startup (php_cli.c:423)
==7684==    by 0x468257: main (php_cli.c:1325)
==7684==
==7684== Conditional jump or move depends on uninitialised value(s)
==7684==    at 0x15F013E: zend_hash_find (zend_hash.c:439)
==7684==    by 0x17157BC: zend_do_inheritance (zend_inheritance.c:602)
==7684==    by 0x158D5DA: zend_register_internal_class_ex (zend_API.c:2662)
==7684==    by 0x164D88A: zend_register_default_exception (zend_exceptions.c:892)
==7684==    by 0x17059F5: zend_register_default_classes (zend_default_classes.c:34)
==7684==    by 0x161A939: zm_startup_core (zend_builtin_functions.c:340)
==7684==    by 0x157E797: zend_startup_module_ex (zend_API.c:1829)
==7684==    by 0x15DB519: zend_hash_apply (zend_hash.c:1460)
==7684==    by 0x1583225: zend_startup_modules (zend_API.c:1955)
==7684==    by 0x1314AD9: php_module_startup (main.c:2194)
==7684==    by 0x18F0C54: php_cli_startup (php_cli.c:423)
==7684==    by 0x468257: main (php_cli.c:1325)
==7684==
==7684== Conditional jump or move depends on uninitialised value(s)
==7684==    at 0x15F04DD: zend_hash_find (zend_hash.c:439)
==7684==    by 0x17157BC: zend_do_inheritance (zend_inheritance.c:602)
==7684==    by 0x158D5DA: zend_register_internal_class_ex (zend_API.c:2662)
==7684==    by 0x164D88A: zend_register_default_exception (zend_exceptions.c:892)
==7684==    by 0x17059F5: zend_register_default_classes (zend_default_classes.c:34)
==7684==    by 0x161A939: zm_startup_core (zend_builtin_functions.c:340)
==7684==    by 0x157E797: zend_startup_module_ex (zend_API.c:1829)
==7684==    by 0x15DB519: zend_hash_apply (zend_hash.c:1460)
==7684==    by 0x1583225: zend_startup_modules (zend_API.c:1955)
==7684==    by 0x1314AD9: php_module_startup (main.c:2194)
==7684==    by 0x18F0C54: php_cli_startup (php_cli.c:423)
==7684==    by 0x468257: main (php_cli.c:1325)
==7684==
==7684== Conditional jump or move depends on uninitialised value(s)
==7684==    at 0x15F013E: zend_hash_find (zend_hash.c:439)
==7684==    by 0x17157BC: zend_do_inheritance (zend_inheritance.c:602)
==7684==    by 0x158D5DA: zend_register_internal_class_ex (zend_API.c:2662)
==7684==    by 0x16A37AC: zend_register_generator_ce (zend_generators.c:1124)
==7684==    by 0x161A939: zm_startup_core (zend_builtin_functions.c:340)
==7684==    by 0x157E797: zend_startup_module_ex (zend_API.c:1829)
==7684==    by 0x15DB519: zend_hash_apply (zend_hash.c:1460)
==7684==    by 0x1583225: zend_startup_modules (zend_API.c:1955)
==7684==    by 0x1314AD9: php_module_startup (main.c:2194)
==7684==    by 0x18F0C54: php_cli_startup (php_cli.c:423)
==7684==    by 0x468257: main (php_cli.c:1325)
==7684==
==7684== Conditional jump or move depends on uninitialised value(s)
==7684==    at 0x15F04DD: zend_hash_find (zend_hash.c:439)
==7684==    by 0x17157BC: zend_do_inheritance (zend_inheritance.c:602)
==7684==    by 0x158D5DA: zend_register_internal_class_ex (zend_API.c:2662)
==7684==    by 0x16A37AC: zend_register_generator_ce (zend_generators.c:1124)
==7684==    by 0x161A939: zm_startup_core (zend_builtin_functions.c:340)
==7684==    by 0x157E797: zend_startup_module_ex (zend_API.c:1829)
==7684==    by 0x15DB519: zend_hash_apply (zend_hash.c:1460)
==7684==    by 0x1583225: zend_startup_modules (zend_API.c:1955)
==7684==    by 0x1314AD9: php_module_startup (main.c:2194)
==7684==    by 0x18F0C54: php_cli_startup (php_cli.c:423)
==7684==    by 0x468257: main (php_cli.c:1325)
==7684==
==7684== Invalid read of size 8
==7684==    at 0x1495EC6: zend_get_class_fetch_type (zend_compile.c:1322)
==7684==    by 0x14C6214: zend_compile_class_ref (zend_compile.c:2130)
==7684==    by 0x14CECA7: zend_compile_static_prop_common (zend_compile.c:2364)
==7684==    by 0x14CF253: zend_compile_static_prop (zend_compile.c:2392)
==7684==    by 0x14C241A: zend_compile_expr (zend_compile.c:7104)
==7684==    by 0x14BF62A: zend_compile_stmt (zend_compile.c:7073)
==7684==    by 0x14E106E: zend_compile_stmt_list (zend_compile.c:4340)
==7684==    by 0x14BF143: zend_compile_stmt (zend_compile.c:6985)
==7684==    by 0x14E7201: zend_compile_for (zend_compile.c:3853)
==7684==    by 0x14BFA67: zend_compile_stmt (zend_compile.c:7022)
==7684==    by 0x14E9665: zend_compile_top_stmt (zend_compile.c:6959)
==7684==    by 0x13E34F7: compile_file (zend_language_scanner.l:607)
==7684==  Address 0x10 is not stack'd, malloc'd or (recently) free'd
==7684==
==7684==
==7684== Process terminating with default action of signal 11 (SIGSEGV)
==7684==  Access not within mapped region at address 0x10
==7684==    at 0x1495EC6: zend_get_class_fetch_type (zend_compile.c:1322)
==7684==    by 0x14C6214: zend_compile_class_ref (zend_compile.c:2130)
==7684==    by 0x14CECA7: zend_compile_static_prop_common (zend_compile.c:2364)
==7684==    by 0x14CF253: zend_compile_static_prop (zend_compile.c:2392)
==7684==    by 0x14C241A: zend_compile_expr (zend_compile.c:7104)
==7684==    by 0x14BF62A: zend_compile_stmt (zend_compile.c:7073)
==7684==    by 0x14E106E: zend_compile_stmt_list (zend_compile.c:4340)
==7684==    by 0x14BF143: zend_compile_stmt (zend_compile.c:6985)
==7684==    by 0x14E7201: zend_compile_for (zend_compile.c:3853)
==7684==    by 0x14BFA67: zend_compile_stmt (zend_compile.c:7022)
==7684==    by 0x14E9665: zend_compile_top_stmt (zend_compile.c:6959)
==7684==    by 0x13E34F7: compile_file (zend_language_scanner.l:607)
==7684==  If you believe this happened as a result of a stack
==7684==  overflow in your program's main thread (unlikely but
==7684==  possible), you can try to increase the size of the
==7684==  main thread stack using the --main-stacksize= flag.
==7684==  The main thread stack size used in this run was 8388608.
Segmentation fault

Program received signal SIGSEGV, Segmentation fault.
zend_get_class_fetch_type (name=0x0) at /home/geeknik/php-src/Zend/zend_compile.c:1322
1322            if (zend_string_equals_literal_ci(name, "self")) {
(gdb) bt
#0  zend_get_class_fetch_type (name=0x0) at /home/geeknik/php-src/Zend/zend_compile.c:1322
#1  0x00000000014c6215 in zend_compile_class_ref (result=result@entry=0x7fffffffa740,
    name_ast=name_ast@entry=0x7ffff6077090, throw_exception=throw_exception@entry=1)
    at /home/geeknik/php-src/Zend/zend_compile.c:2130
#2  0x00000000014ceca8 in zend_compile_static_prop_common (result=0x7fffffffa870, ast=<optimized out>,
    type=type@entry=0, delayed=0) at /home/geeknik/php-src/Zend/zend_compile.c:2364
#3  0x00000000014cf254 in zend_compile_static_prop (result=<optimized out>, ast=<optimized out>, type=0,
    delayed=<optimized out>) at /home/geeknik/php-src/Zend/zend_compile.c:2392
#4  0x00000000014c241b in zend_compile_expr (result=result@entry=0x7fffffffa870,
    ast=ast@entry=0x7ffff60770b8) at /home/geeknik/php-src/Zend/zend_compile.c:7104
#5  0x00000000014bf62b in zend_compile_stmt (ast=0x7ffff60770b8)
    at /home/geeknik/php-src/Zend/zend_compile.c:7073
#6  0x00000000014e106f in zend_compile_stmt_list (ast=ast@entry=0x7ffff6077048)
    at /home/geeknik/php-src/Zend/zend_compile.c:4340
#7  0x00000000014bf144 in zend_compile_stmt (ast=ast@entry=0x7ffff6077048)
    at /home/geeknik/php-src/Zend/zend_compile.c:6985
#8  0x00000000014e7202 in zend_compile_for (ast=ast@entry=0x7ffff60770d0)
    at /home/geeknik/php-src/Zend/zend_compile.c:3853
#9  0x00000000014bfa68 in zend_compile_stmt (ast=ast@entry=0x7ffff60770d0)
    at /home/geeknik/php-src/Zend/zend_compile.c:7022
#10 0x00000000014e9666 in zend_compile_top_stmt (ast=0x7ffff60770d0)
    at /home/geeknik/php-src/Zend/zend_compile.c:6959
#11 zend_compile_top_stmt (ast=0x7ffff6077018) at /home/geeknik/php-src/Zend/zend_compile.c:6954
#12 0x00000000013e34f8 in compile_file (file_handle=<optimized out>, type=<optimized out>)
    at Zend/zend_language_scanner.l:607
#13 0x0000000000e95f50 in phar_compile_file (file_handle=0x7fffffffd270, type=8)
    at /home/geeknik/php-src/ext/phar/phar.c:3311
#14 0x0000000001565777 in zend_execute_scripts (type=type@entry=8, retval=retval@entry=0x0,
    file_count=file_count@entry=3) at /home/geeknik/php-src/Zend/zend.c:1422
#15 0x00000000013172a8 in php_execute_script (primary_file=primary_file@entry=0x7fffffffd270)
    at /home/geeknik/php-src/main/main.c:2471
#16 0x00000000018f5485 in do_cli (argc=2, argv=0x206d9f0) at /home/geeknik/php-src/sapi/cli/php_cli.c:974
#17 0x0000000000468e05 in main (argc=2, argv=0x206d9f0) at /home/geeknik/php-src/sapi/cli/php_cli.c:1345
(gdb) i r
rax            0x0      0
rbx            0x7fffffffa740   140737488332608
rcx            0x4      4
rdx            0x0      0
rsi            0x0      0
rdi            0x0      0
rbp            0x7ffff6077090   0x7ffff6077090
rsp            0x7fffffffa6c0   0x7fffffffa6c0
r8             0x4      4
r9             0x0      0
r10            0x0      0
r11            0x7ffff6b53fb0   140737332461488
r12            0x1      1
r13            0x0      0
r14            0x7ffff60770b8   140737321070776
r15            0x7fffffffa870   140737488332912
rip            0x1495ec6        0x1495ec6 <zend_get_class_fetch_type+86>
eflags         0x10246  [ PF ZF IF RF ]
cs             0x33     51
ss             0x2b     43
ds             0x0      0
es             0x0      0
fs             0x0      0
gs             0x0      0


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AllCommentsChangesGit/SVN commitsRelated reports
 [2015-10-24 21:21 UTC] nikic@php.net
Automatic comment on behalf of nikic
Revision: http://git.php.net/?p=php-src.git;a=commit;h=b9cc3176eb4211b01ab19554cbab490efc48d715
Log: Fix bug #70782
 [2015-10-24 21:21 UTC] nikic@php.net
-Status: Open +Status: Closed
 [2015-10-25 12:42 UTC] ab@php.net
Automatic comment on behalf of nikic
Revision: http://git.php.net/?p=php-src.git;a=commit;h=2e7290f046ecf01ad47707e774f5eb1c10ed63be
Log: Fix bug #70782
 [2016-07-20 11:35 UTC] davey@php.net
Automatic comment on behalf of nikic
Revision: http://git.php.net/?p=php-src.git;a=commit;h=b9cc3176eb4211b01ab19554cbab490efc48d715
Log: Fix bug #70782
 
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