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commit c2c6d39fab901c97c18fa3a3a3658d9dc3f7df61
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Author: Paul Pluzhnikov <ppluzhnikov@google.com>
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Date: Mon Mar 2 13:34:22 2015 -0800
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Fix BZ 18036 buffer overflow (read past end of buffer) in internal_fnmatch
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--- glibc-2.17-c758a686/posix/fnmatch_loop.c
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+++ glibc-2.17-c758a686/posix/fnmatch_loop.c
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@@ -1036,7 +1036,12 @@ END (const CHAR *pattern)
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}
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else if ((*p == L('?') || *p == L('*') || *p == L('+') || *p == L('@')
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|| *p == L('!')) && p[1] == L('('))
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- p = END (p + 1);
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+ {
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+ p = END (p + 1);
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+ if (*p == L('\0'))
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+ /* This is an invalid pattern. */
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+ return pattern;
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+ }
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else if (*p == L(')'))
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break;
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diff --git glibc-2.17-c758a686/posix/tst-fnmatch3.c glibc-2.17-c758a686/posix/tst-fnmatch3.c
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index 75bc00a..fdf9934 100644
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--- glibc-2.17-c758a686/posix/tst-fnmatch3.c
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+++ glibc-2.17-c758a686/posix/tst-fnmatch3.c
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@@ -17,6 +17,26 @@
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<http://www.gnu.org/licenses/>. */
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#include <fnmatch.h>
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+#include <sys/mman.h>
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+#include <string.h>
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+#include <unistd.h>
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+
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+int
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+do_bz18036 (void)
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+{
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+ const char p[] = "**(!()";
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+ const int pagesize = getpagesize ();
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+
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+ char *pattern = mmap (0, 2 * pagesize, PROT_READ|PROT_WRITE,
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+ MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
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+ if (pattern == MAP_FAILED) return 1;
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+
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+ mprotect (pattern + pagesize, pagesize, PROT_NONE);
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+ memset (pattern, ' ', pagesize);
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+ strcpy (pattern, p);
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+
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+ return fnmatch (pattern, p, FNM_EXTMATCH);
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+}
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int
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do_test (void)
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@@ -25,7 +45,7 @@ do_test (void)
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return 1;
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if (fnmatch ("[a[.\0.]]", "a", 0) != FNM_NOMATCH)
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return 1;
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- return 0;
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+ return do_bz18036 ();
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}
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#define TEST_FUNCTION do_test ()
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