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[2020-09-18 12:03 UTC] cmb@php.net
-Status: Open
+Status: Verified
-Type: Security
+Type: Bug
[2020-09-18 12:03 UTC] cmb@php.net
[2020-09-18 17:07 UTC] stas@php.net
[2020-10-01 14:55 UTC] nikic@php.net
[2020-10-01 15:02 UTC] nikic@php.net
-Summary: NullPointer dereference
+Summary: Null pointer deref if CurlHandle directly
instantiated
[2020-10-01 15:06 UTC] nikic@php.net
[2020-10-01 15:06 UTC] nikic@php.net
-Status: Verified
+Status: Closed
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Last updated: Mon Oct 27 03:00:02 2025 UTC |
Description: ------------ NullPointer dereference in _php_curl_verify_handlers ./configure --with-curl built with ASAN php-src-php-8.0.0beta4-asan$ ./sapi/cli/php -r '$a=new ($ch = curl_init("http://AAAAA"));' ASAN:DEADLYSIGNAL ================================================================= ==27740==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000020 (pc 0x0000005f54cd bp 0x000000000000 sp 0x7ffebd8eeb50 T0) ==27740==The signal is caused by a READ memory access. ==27740==Hint: address points to the zero page. #0 0x5f54cc in _php_curl_verify_handlers /php-src-php-8.0.0beta4/ext/curl/interface.c:148 #1 0x5f5797 in curl_free_obj /php-src-php-8.0.0beta4/ext/curl/interface.c:3311 #2 0xa5c9d6 in zend_objects_store_del /php-src-php-8.0.0beta4/Zend/zend_objects_API.c:193 #3 0x9af3fa in zval_ptr_dtor_nogc /php-src-php-8.0.0beta4-asan/Zend/zend_variables.h:35:3 #4 0x9af3fa in ZEND_HANDLE_EXCEPTION_SPEC_HANDLER /php-src-php-8.0.0beta4-asan/Zend/zend_vm_execute.h:3157 #5 0x80f1e3 in execute_ex /php-src-php-8.0.0beta4-asan/Zend/zend_vm_execute.h:55130:7 #6 0x80fcf6 in zend_execute /php-src-php-8.0.0beta4-asan/Zend/zend_vm_execute.h:59926:2 #7 0x7d492f in zend_eval_stringl /php-src-php-8.0.0beta4/Zend/zend_execute_API.c:1195 #8 0x7d4af8 in zend_eval_stringl_ex /php-src-php-8.0.0beta4/Zend/zend_execute_API.c:1236 #9 0xa64032 in do_cli /php-src-php-8.0.0beta4/sapi/cli/php_cli.c:979 #10 0x457c0a in main /php-src-php-8.0.0beta4/sapi/cli/php_cli.c:1336 #11 0x7fc1fd730b96 in __libc_start_main /build/glibc-2ORdQG/glibc-2.27/csu/../csu/libc-start.c:310 #12 0x4582f9 in _start (/php-src-php-8.0.0beta4-asan/sapi/cli/php+0x4582f9) AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: SEGV /php-src-php-8.0.0beta4/ext/curl/interface.c:148 in _php_curl_verify_handlers ==27740==ABORTING built without ASAN php-src-php-8.0.0beta4$ ./sapi/cli/php -r '$a=new ($ch = curl_init("http://AAAAA"));' Segmentation fault (core dumped) gef➤ r -r '$a=new ($ch = curl_init("http://AAAAA"));' Starting program: /php-src-php-8.0.0beta4/sapi/cli/php -r '$a=new ($ch = curl_init("http://AAAAA"));' [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Program received signal SIGSEGV, Segmentation fault. [ Legend: Modified register | Code | Heap | Stack | String ] ────────────────────────────────────────────────────────────────────────────────────────── registers ──── $rax : 0x0 $rbx : 0x00007fffee891300 → 0x0000000000000000 $rcx : 0x00007fffee852000 → 0x0000000000000000 $rdx : 0x0000555556556960 → 0x0000000000000148 $rsp : 0x00007fffffffc5c0 → 0x00007fffee891448 → 0x0000030800000001 $rbp : 0x0 $rsi : 0x0 $rdi : 0x00007fffee891300 → 0x0000000000000000 $rip : 0x000055555570d79d → <_php_curl_verify_handlers+13> cmp BYTE PTR [rax+0x20], 0x0 $r8 : 0x00005555565b2c10 → 0x000001d600000001 $r9 : 0x00005555566171f0 → 0x0000000000000001 $r10 : 0x00007fffee800000 → 0x00007fffee800040 → 0x0000000000000000 $r11 : 0x100000 $r12 : 0x00007fffee891300 → 0x0000000000000000 $r13 : 0x0 $r14 : 0x00007fffee812020 → 0x0000555556570518 → 0x00005555559426bb → <execute_ex+5723> call 0x55555593dd90 <ZEND_HANDLE_EXCEPTION_SPEC_HANDLER> $r15 : 0x0000555556570518 → 0x00005555559426bb → <execute_ex+5723> call 0x55555593dd90 <ZEND_HANDLE_EXCEPTION_SPEC_HANDLER> $eflags: [ZERO carry PARITY adjust sign trap INTERRUPT direction overflow RESUME virtualx86 identification] $cs: 0x0033 $ss: 0x002b $ds: 0x0000 $es: 0x0000 $fs: 0x0000 $gs: 0x0000 ────────────────────────────────────────────────────────────────────────────────────────────── stack ──── 0x00007fffffffc5c0│+0x0000: 0x00007fffee891448 → 0x0000030800000001 ← $rsp 0x00007fffffffc5c8│+0x0008: 0x0000000000000002 0x00007fffffffc5d0│+0x0010: 0x00007fffee891300 → 0x0000000000000000 0x00007fffffffc5d8│+0x0018: 0x000055555570da68 → <curl_free_obj+24> mov rdi, QWORD PTR [rbx-0x148] 0x00007fffffffc5e0│+0x0020: 0x00007fffee891448 → 0x0000030800000001 0x00007fffffffc5e8│+0x0028: 0x0000000000000002 0x00007fffffffc5f0│+0x0030: 0x0000000000000002 0x00007fffffffc5f8│+0x0038: 0x00005555559687b7 → <zend_objects_store_del+87> mov rdx, QWORD PTR [rbx+0x18] ──────────────────────────────────────────────────────────────────────────────────────── code:x86:64 ──── 0x55555570d795 <_php_curl_verify_handlers+5> push rbx 0x55555570d796 <_php_curl_verify_handlers+6> mov rax, QWORD PTR [rdi+0x8] 0x55555570d79a <_php_curl_verify_handlers+10> mov rbx, rdi → 0x55555570d79d <_php_curl_verify_handlers+13> cmp BYTE PTR [rax+0x20], 0x0 0x55555570d7a1 <_php_curl_verify_handlers+17> jne 0x55555570d858 <_php_curl_verify_handlers+200> 0x55555570d7a7 <_php_curl_verify_handlers+23> mov rdx, QWORD PTR [rax+0x10] 0x55555570d7ab <_php_curl_verify_handlers+27> test rdx, rdx 0x55555570d7ae <_php_curl_verify_handlers+30> je 0x55555570d7ba <_php_curl_verify_handlers+42> 0x55555570d7b0 <_php_curl_verify_handlers+32> cmp BYTE PTR [rdx+0x50], 0x0 ────────────────────────────────────────────────────────────────── source:/php[...].c+153 ──── 148 { 149 php_stream *stream; 150 151 ZEND_ASSERT(ch && ch->handlers); 152 → 153 if (!Z_ISUNDEF(ch->handlers->std_err)) { 154 stream = (php_stream *)zend_fetch_resource2_ex(&ch->handlers->std_err, NULL, php_file_le_stream(), php_file_le_pstream()); 155 if (stream == NULL) { 156 if (reporterror) { 157 php_error_docref(NULL, E_WARNING, "CURLOPT_STDERR resource has gone away, resetting to stderr"); 158 } ──────────────────────────────────────────────────────────────────────────────────────────── threads ──── [#0] Id 1, Name: "php", stopped, reason: SIGSEGV ────────────────────────────────────────────────────────────────────────────────────────────── trace ──── [#0] 0x55555570d79d → _php_curl_verify_handlers(ch=0x7fffee891300, reporterror=0x0) [#1] 0x55555570da68 → curl_free_obj(object=0x7fffee891448) [#2] 0x5555559687b7 → zend_objects_store_del(object=0x7fffee891448) [#3] 0x55555593df0a → zval_ptr_dtor_nogc(zval_ptr=<optimized out>) [#4] 0x55555593df0a → ZEND_HANDLE_EXCEPTION_SPEC_HANDLER() [#5] 0x5555559426c0 → execute_ex(ex=0x7fffee891300) [#6] 0x555555949a1f → zend_execute(op_array=<optimized out>, return_value=0x7fffffffc750) [#7] 0x5555558cf9b0 → zend_eval_stringl(str=0x5555565a50f0 "$a=new ($ch = curl_init(\"http://AAAAA\"));", str_len=<optimized out>, retval_ptr=0x0, string_name=0x55555610cc55 "Command line code") [#8] 0x5555558cfb79 → zend_eval_stringl_ex(str=<optimized out>, str_len=<optimized out>, retval_ptr=<optimized out>, string_name=<optimized out>, handle_exceptions=<optimized out>) [#9] 0x55555596fd93 → do_cli(argc=0x3, argv=0x5555565a5070) ───────────────────────────────────────────────────────────────────────────────────────────────────────── _php_curl_verify_handlers (ch=0x7fffee891300, reporterror=0x0) at /php-src-php-8.0.0beta4/ext/curl/interface.c:153 153 if (!Z_ISUNDEF(ch->handlers->std_err)) { tested against different php8 releases Test script: --------------- <?php $a = new ($ch = curl_init('foo/bar'));