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219 lines
6.6 KiB
219 lines
6.6 KiB
From 5165de69c0908e28a380cbd4bb054e55ea4abc95 Mon Sep 17 00:00:00 2001
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From: "H.J. Lu" <hjl.tools@gmail.com>
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Date: Mon, 21 Jan 2019 11:36:36 -0800
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Subject: [PATCH] x86-64 strnlen/wcsnlen: Properly handle the length parameter
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[BZ# 24097]
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Content-type: text/plain; charset=UTF-8
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On x32, the size_t parameter may be passed in the lower 32 bits of a
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64-bit register with the non-zero upper 32 bits. The string/memory
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functions written in assembly can only use the lower 32 bits of a
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64-bit register as length or must clear the upper 32 bits before using
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the full 64-bit register for length.
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This pach fixes strnlen/wcsnlen for x32. Tested on x86-64 and x32. On
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x86-64, libc.so is the same with and withou the fix.
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[BZ# 24097]
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CVE-2019-6488
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* sysdeps/x86_64/multiarch/strlen-avx2.S: Use RSI_LP for length.
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Clear the upper 32 bits of RSI register.
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* sysdeps/x86_64/strlen.S: Use RSI_LP for length.
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* sysdeps/x86_64/x32/Makefile (tests): Add tst-size_t-strnlen
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and tst-size_t-wcsnlen.
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* sysdeps/x86_64/x32/tst-size_t-strnlen.c: New file.
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* sysdeps/x86_64/x32/tst-size_t-wcsnlen.c: Likewise.
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---
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sysdeps/x86_64/multiarch/strlen-avx2.S | 9 ++--
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sysdeps/x86_64/strlen.S | 12 ++---
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sysdeps/x86_64/x32/Makefile | 4 +-
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sysdeps/x86_64/x32/tst-size_t-strnlen.c | 72 +++++++++++++++++++++++++
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sysdeps/x86_64/x32/tst-size_t-wcsnlen.c | 20 +++++++
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5 files changed, 106 insertions(+), 11 deletions(-)
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create mode 100644 sysdeps/x86_64/x32/tst-size_t-strnlen.c
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create mode 100644 sysdeps/x86_64/x32/tst-size_t-wcsnlen.c
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Conflicts:
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ChangeLog
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(removed)
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diff --git a/sysdeps/x86_64/multiarch/strlen-avx2.S b/sysdeps/x86_64/multiarch/strlen-avx2.S
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index fb2418cd..645e0446 100644
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--- a/sysdeps/x86_64/multiarch/strlen-avx2.S
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+++ b/sysdeps/x86_64/multiarch/strlen-avx2.S
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@@ -42,12 +42,15 @@
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ENTRY (STRLEN)
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# ifdef USE_AS_STRNLEN
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/* Check for zero length. */
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- testq %rsi, %rsi
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+ test %RSI_LP, %RSI_LP
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jz L(zero)
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# ifdef USE_AS_WCSLEN
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- shl $2, %rsi
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+ shl $2, %RSI_LP
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+# elif defined __ILP32__
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+ /* Clear the upper 32 bits. */
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+ movl %esi, %esi
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# endif
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- movq %rsi, %r8
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+ mov %RSI_LP, %R8_LP
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# endif
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movl %edi, %ecx
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movq %rdi, %rdx
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diff --git a/sysdeps/x86_64/strlen.S b/sysdeps/x86_64/strlen.S
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index 01cb5fa8..f845f3d4 100644
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--- a/sysdeps/x86_64/strlen.S
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+++ b/sysdeps/x86_64/strlen.S
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@@ -59,21 +59,21 @@ ENTRY(strlen)
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#ifdef AS_STRNLEN
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/* Do not read anything when n==0. */
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- test %rsi, %rsi
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+ test %RSI_LP, %RSI_LP
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jne L(n_nonzero)
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xor %rax, %rax
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ret
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L(n_nonzero):
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# ifdef AS_WCSLEN
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- shlq $2, %rsi
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+ shl $2, %RSI_LP
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# endif
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/* Initialize long lived registers. */
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- add %rdi, %rsi
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- mov %rsi, %r10
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- and $-64, %r10
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- mov %rsi, %r11
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+ add %RDI_LP, %RSI_LP
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+ mov %RSI_LP, %R10_LP
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+ and $-64, %R10_LP
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+ mov %RSI_LP, %R11_LP
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#endif
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pxor %xmm0, %xmm0
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diff --git a/sysdeps/x86_64/x32/Makefile b/sysdeps/x86_64/x32/Makefile
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index 2a9e20a9..1557724b 100644
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--- a/sysdeps/x86_64/x32/Makefile
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+++ b/sysdeps/x86_64/x32/Makefile
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@@ -8,10 +8,10 @@ endif
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ifeq ($(subdir),string)
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tests += tst-size_t-memchr tst-size_t-memcmp tst-size_t-memcpy \
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tst-size_t-memrchr tst-size_t-memset tst-size_t-strncasecmp \
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- tst-size_t-strncmp tst-size_t-strncpy
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+ tst-size_t-strncmp tst-size_t-strncpy tst-size_t-strnlen
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endif
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ifeq ($(subdir),wcsmbs)
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tests += tst-size_t-wmemchr tst-size_t-wmemcmp tst-size_t-wmemset \
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- tst-size_t-wcsncmp
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+ tst-size_t-wcsncmp tst-size_t-wcsnlen
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endif
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diff --git a/sysdeps/x86_64/x32/tst-size_t-strnlen.c b/sysdeps/x86_64/x32/tst-size_t-strnlen.c
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new file mode 100644
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index 00000000..690a4a8a
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--- /dev/null
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+++ b/sysdeps/x86_64/x32/tst-size_t-strnlen.c
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@@ -0,0 +1,72 @@
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+/* Test strnlen 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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+
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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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+
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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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+
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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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+
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+#ifdef WIDE
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+# define TEST_NAME "wcsnlen"
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+#else
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+# define TEST_NAME "strnlen"
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+#endif /* WIDE */
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+
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+#include "test-size_t.h"
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+
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+#ifdef WIDE
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+# include <wchar.h>
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+# define STRNLEN wcsnlen
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+# define CHAR wchar_t
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+#else
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+# define STRNLEN strnlen
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+# define CHAR char
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+#endif /* WIDE */
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+
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+IMPL (STRNLEN, 1)
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+
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+typedef size_t (*proto_t) (const CHAR *, size_t);
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+
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+static size_t
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+__attribute__ ((noinline, noclone))
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+do_strnlen (parameter_t a, parameter_t b)
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+{
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+ return CALL (&a, a.p, b.len);
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+}
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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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+
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+ size_t size = page_size / sizeof (CHAR);
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+ parameter_t src = { { 0 }, buf2 };
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+ parameter_t c = { { size }, (void *) (uintptr_t) 'a' };
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+
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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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+ size_t res = do_strnlen (src, c);
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+ if (res != size)
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+ {
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+ error (0, 0, "Wrong result in function %s: 0x%x != 0x%x",
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+ impl->name, res, size);
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+ ret = 1;
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+ }
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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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+
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+#include <support/test-driver.c>
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diff --git a/sysdeps/x86_64/x32/tst-size_t-wcsnlen.c b/sysdeps/x86_64/x32/tst-size_t-wcsnlen.c
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new file mode 100644
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index 00000000..093b4bbe
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--- /dev/null
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+++ b/sysdeps/x86_64/x32/tst-size_t-wcsnlen.c
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@@ -0,0 +1,20 @@
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+/* Test wcsnlen 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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+
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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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+
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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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+
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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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+
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+#define WIDE 1
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+#include "tst-size_t-strnlen.c"
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--
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GitLab
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