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From: "konstantin.s.serebryany at gmail dot com" <sourceware-bugzilla@sourceware.org> To: glibc-bugs@sourceware.org Subject: [Bug regex/17062] New: fnmatch: buffer overflow read from pattern "[[:alpha:]'[:alpha:]" Date: Tue, 17 Jun 2014 15:22:00 -0000 [thread overview] Message-ID: <bug-17062-131@http.sourceware.org/bugzilla/> (raw) https://sourceware.org/bugzilla/show_bug.cgi?id=17062 Bug ID: 17062 Summary: fnmatch: buffer overflow read from pattern "[[:alpha:]'[:alpha:]" Product: glibc Version: 2.19 Status: NEW Severity: normal Priority: P2 Component: regex Assignee: unassigned at sourceware dot org Reporter: konstantin.s.serebryany at gmail dot com CC: drepper.fsp at gmail dot com Created attachment 7641 --> https://sourceware.org/bugzilla/attachment.cgi?id=7641&action=edit fn1.c Given the pattern "[[:alpha:]'[:alpha:]" and locale "en_US.UTF8" fnmatch() will read at least 1 byte past the end of the pattern buffer (maybe more). Initially found with ASAN-instrumented glibc, then confirmed without ASAN. At least 2.19 and fresh trunk are affected. ASAN report: ==8418==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60300000eff5 READ of size 1 at 0x60300000eff5 thread T0 #0 0x7f31375019f1 in internal_fnmatch glibc-2.19/posix/fnmatch_loop.c:918 #1 0x7f3137501cb7 in __GI_fnmatch glibc-2.19/posix/fnmatch.c:454 #2 0x4b364f in main fn1.c:14 0x60300000eff5 is located 0 bytes to the right of 21-byte region [0x60300000efe0,0x60300000eff5) allocated by thread T0 here: #0 0x494ff9 in malloc #1 0x7f31374947a5 in __GI___strdup glibc-2.19/string/strdup.c:42 #2 0x4b363d in main fn1.c:12 Full reproducer attached. Currently it's a bit tricky to build ASAN-instrumented glibc, but this reproducer happily crashes w/o any tool. #0 0x7fee9d62d443 in internal_fnmatch glibc-trunk/posix/fnmatch_loop.c:903 #1 0x7fee9d62dedd in __GI_fnmatch glibc-trunk/posix/fnmatch.c:454 #2 0x4b3012 in main fn1.c:30 -- You are receiving this mail because: You are on the CC list for the bug.
next reply other threads:[~2014-06-17 15:22 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-06-17 15:22 konstantin.s.serebryany at gmail dot com [this message] 2014-06-17 17:37 ` [Bug libc/17062] " jsm28 at gcc dot gnu.org 2014-06-18 12:21 ` cvs-commit at gcc dot gnu.org 2014-06-18 12:25 ` schwab@linux-m68k.org 2014-06-19 15:06 ` bugdal at aerifal dot cx 2015-02-18 14:32 ` fweimer at redhat dot com
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