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68507377f2
The inline and library functions that the CMSG_NXTHDR macro may expand
to increment the pointer to the header before checking the stride of
the increment against available space. Since C only allows incrementing
pointers to one past the end of an array, the increment must be done
after a length check. This commit fixes that and includes a regression
test for CMSG_FIRSTHDR and CMSG_NXTHDR.
The Linux, Hurd, and generic headers are all changed.
Tested on Linux on armv7hl, i686, x86_64, aarch64, ppc64le, and s390x.
[BZ #28846]
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
(cherry picked from commit 9c443ac455)
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/* Test ancillary data header creation.
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Copyright (C) 2022 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 <sys/socket.h>
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#include <gnu/lib-names.h>
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#include <support/xdlfcn.h>
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#include <support/check.h>
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#define PAYLOAD "Hello, World!"
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/* CMSG_NXTHDR is a macro that calls an inline function defined in
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bits/socket.h. In case the function cannot be inlined, libc.so carries
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a copy. Both versions need to be tested. */
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#define CMSG_NXTHDR_IMPL CMSG_NXTHDR
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#include "tst-cmsghdr-skeleton.c"
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#undef CMSG_NXTHDR_IMPL
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static struct cmsghdr * (* cmsg_nxthdr) (struct msghdr *, struct cmsghdr *);
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#define CMSG_NXTHDR_IMPL cmsg_nxthdr
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#include "tst-cmsghdr-skeleton.c"
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#undef CMSG_NXTHDR_IMPL
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static int
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do_test (void)
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{
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static void *handle;
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run_test_CMSG_NXTHDR ();
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handle = xdlopen (LIBC_SO, RTLD_LAZY);
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cmsg_nxthdr = (struct cmsghdr * (*) (struct msghdr *, struct cmsghdr *))
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xdlsym (handle, "__cmsg_nxthdr");
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run_test_cmsg_nxthdr ();
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return 0;
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}
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#include <support/test-driver.c>
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