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From: "konstantin.s.serebryany at gmail dot com" <sourceware-bugzilla@sourceware.org> To: glibc-bugs@sourceware.org Subject: [Bug libc/18036] New: buffer overflow (read past end of buffer) in internal_fnmatch=>end_pattern with "**(!()" pattern Date: Thu, 26 Feb 2015 18:12:00 -0000 [thread overview] Message-ID: <bug-18036-131@http.sourceware.org/bugzilla/> (raw) https://sourceware.org/bugzilla/show_bug.cgi?id=18036 Bug ID: 18036 Summary: buffer overflow (read past end of buffer) in internal_fnmatch=>end_pattern with "**(!()" pattern Product: glibc Version: 2.21 Status: NEW Severity: normal Priority: P2 Component: libc Assignee: unassigned at sourceware dot org Reporter: konstantin.s.serebryany at gmail dot com CC: drepper.fsp at gmail dot com Flags: security+ Similar to https://sourceware.org/bugzilla/show_bug.cgi?id=18032 but in a different place: #include <fnmatch.h> #include <string.h> #include <stdlib.h> #include <stdio.h> #include <sys/mman.h> #include <unistd.h> #include <assert.h> int main(int argc, const char* argv[]) { long page_size = sysconf (_SC_PAGESIZE); assert(page_size > 0); char *page = mmap (NULL, 2 * page_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); assert(page != MAP_FAILED); assert(!mprotect (page + page_size, page_size, PROT_NONE)); memset (page, ' ', page_size); const char p[] = "**(!()"; strcpy(page, p); fnmatch(page, p, FNM_EXTMATCH); } gcc fn3.c && ./a.out Segmentation fault (core dumped) gdb: (gdb) bt #0 0x00007ffff7adaf4b in end_pattern (pattern=pattern@entry=0x7ffff7ff6002 "(!()") at fnmatch_loop.c:1032 #1 0x00007ffff7adcbb9 in internal_fnmatch (pattern=<optimized out>, string=string@entry=0x7fffffffdcd0 "**(!()", string_end=0x7fffffffdcd6 "", no_leading_period=no_leading_period@entry=0, flags=flags@entry=32, ends=ends@entry=0x0, alloca_used=alloca_used@entry=0) at fnmatch_loop.c:128 #2 0x00007ffff7addf72 in __fnmatch (pattern=0x7ffff7ff6000 "**(!()", string=0x7fffffffdcd0 "**(!()", flags=32) at fnmatch.c:458 #3 0x000000000040084a in main () Reproduces on 2.19 and fresh trunk. Marking as security+ similar to bug 18032 Since bug 18032 has been fixed promptly I assume you don't mind these reports. -- You are receiving this mail because: You are on the CC list for the bug.
next reply other threads:[~2015-02-26 18:12 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-02-26 18:12 konstantin.s.serebryany at gmail dot com [this message] 2015-02-26 18:22 ` [Bug libc/18036] " ppluzhnikov at google dot com 2015-02-28 5:07 ` ppluzhnikov at google dot com 2015-03-02 21:37 ` cvs-commit at gcc dot gnu.org 2015-03-02 21:38 ` ppluzhnikov at google dot com 2023-06-06 12:24 ` helmut at subdivi dot de 2023-06-25 20:38 ` carnil at debian dot org 2023-06-25 20:38 ` carnil at debian dot org
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