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23514c72b7
__vsyslog_internal did not handle a case where printing a SYSLOG_HEADER
containing a long program name failed to update the required buffer
size, leading to the allocation and overflow of a too-small buffer on
the heap. This commit fixes that. It also adds a new regression test
that uses glibc.malloc.check.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit 6bd0e4efcc)
40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
/* Test heap buffer overflow in syslog with long __progname (CVE-2023-6246)
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Copyright (C) 2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <syslog.h>
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#include <string.h>
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extern char * __progname;
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static int
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do_test (void)
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{
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char long_progname[2048];
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memset (long_progname, 'X', sizeof (long_progname) - 1);
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long_progname[sizeof (long_progname) - 1] = '\0';
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__progname = long_progname;
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syslog (LOG_INFO, "Hello, World!");
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return 0;
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}
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#include <support/test-driver.c>
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