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On x32, the size_t parameter may be passed in the lower 32 bits of a 64-bit register with the non-zero upper 32 bits. The string/memory functions written in assembly can only use the lower 32 bits of a 64-bit register as length or must clear the upper 32 bits before using the full 64-bit register for length. This pach fixes memcpy for x32. Tested on x86-64 and x32. On x86-64, libc.so is the same with and withou the fix. [BZ# 24097] CVE-2019-6488 * sysdeps/x86_64/multiarch/memcpy-ssse3-back.S: Use RDX_LP for length. Clear the upper 32 bits of RDX register. * sysdeps/x86_64/multiarch/memcpy-ssse3.S: Likewise. * sysdeps/x86_64/multiarch/memmove-avx512-no-vzeroupper.S: Likewise. * sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S: Likewise. * sysdeps/x86_64/x32/Makefile (tests): Add tst-size_t-memcpy. tst-size_t-wmemchr. * sysdeps/x86_64/x32/tst-size_t-memcpy.c: New file.
59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/* Test memcpy with size_t in the lower 32 bits of 64-bit register.
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Copyright (C) 2019 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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<http://www.gnu.org/licenses/>. */
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#define TEST_NAME "memcpy"
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#include "test-size_t.h"
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IMPL (memcpy, 1)
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typedef void *(*proto_t) (void *, const void *, size_t);
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static void *
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__attribute__ ((noinline, noclone))
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do_memcpy (parameter_t a, parameter_t b)
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{
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return CALL (&b, a.p, b.p, a.len);
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}
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static int
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test_main (void)
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{
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test_init ();
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parameter_t dest = { { page_size }, buf1 };
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parameter_t src = { { 0 }, buf2 };
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int ret = 0;
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FOR_EACH_IMPL (impl, 0)
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{
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src.fn = impl->fn;
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do_memcpy (dest, src);
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int res = memcmp (dest.p, src.p, dest.len);
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if (res)
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{
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error (0, 0, "Wrong result in function %s: %i != 0",
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impl->name, res);
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ret = 1;
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}
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}
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return ret ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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#include <support/test-driver.c>
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