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Fix BZ 18036 buffer overflow (read past end of buffer) in internal_fnmatch

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This commit is contained in:
Paul Pluzhnikov 2015-03-02 13:34:22 -08:00
parent e8b6be0016
commit c2c6d39fab
4 changed files with 35 additions and 4 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2015-03-02 Paul Pluzhnikov <ppluzhnikov@google.com>
[BZ #18036]
* posix/fnmatch_loop.c (END): Detect invalid pattern.
* posix/tst-fnmatch3.c (do_bz18036): Add test case.
2015-03-02 Andreas Schwab <schwab@suse.de>
* elf/Makefile ($(elf-objpfx)runtime-linker.st): Fix typo in

4
NEWS
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@ -12,8 +12,8 @@ Version 2.22
4719, 14841, 13064, 14094, 15319, 15467, 15790, 15969, 16351, 16560,
16783, 17269, 17523, 17569, 17588, 17711, 17792, 17836, 17912, 17916,
17932, 17944, 17949, 17964, 17965, 17967, 17969, 17978, 17987, 17991,
17996, 17998, 17999, 18019, 18020, 18029, 18030, 18032, 18038, 18039,
18046, 18047.
17996, 17998, 17999, 18019, 18020, 18029, 18030, 18032, 18036, 18038,
18039, 18046, 18047.
* Character encoding and ctype tables were updated to Unicode 7.0.0, using
new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red

7
posix/fnmatch_loop.c
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@ -1036,7 +1036,12 @@ END (const CHAR *pattern)
}
else if ((*p == L('?') || *p == L('*') || *p == L('+') || *p == L('@')
|| *p == L('!')) && p[1] == L('('))
p = END (p + 1);
{
p = END (p + 1);
if (*p == L('\0'))
/* This is an invalid pattern. */
return pattern;
}
else if (*p == L(')'))
break;

22
posix/tst-fnmatch3.c
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@ -17,6 +17,26 @@
<http://www.gnu.org/licenses/>. */
#include <fnmatch.h>
#include <sys/mman.h>
#include <string.h>
#include <unistd.h>
int
do_bz18036 (void)
{
const char p[] = "**(!()";
const int pagesize = getpagesize ();
char *pattern = mmap (0, 2 * pagesize, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
if (pattern == MAP_FAILED) return 1;
mprotect (pattern + pagesize, pagesize, PROT_NONE);
memset (pattern, ' ', pagesize);
strcpy (pattern, p);
return fnmatch (pattern, p, FNM_EXTMATCH);
}
int
do_test (void)
@ -25,7 +45,7 @@ do_test (void)
return 1;
if (fnmatch ("[a[.\0.]]", "a", 0) != FNM_NOMATCH)
return 1;
return 0;
return do_bz18036 ();
}
#define TEST_FUNCTION do_test ()