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[Bug string/21014] i686 memchr overflows internal pointer check
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Mon, 02 Jan 2017 19:53:47 +0000
- Subject: [Bug string/21014] i686 memchr overflows internal pointer check
- Auto-submitted: auto-generated
- References: <bug-21014-131@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=21014
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=23d27709a423aec32821e9a5198a10267107bae2
commit 23d27709a423aec32821e9a5198a10267107bae2
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Mon Jan 2 12:20:21 2017 -0200
Fix i686 memchr for large input sizes
Similar to BZ#19387 and BZ#20971, both i686 memchr optimized assembly
implementations (memchr-sse2-bsf and memchr-sse2) do not handle the
size overflow correctly.
It is shown by the new tests added by commit 3daef2c8ee4df29, where
both implementation fails with size as SIZE_MAX.
This patch uses a similar strategy used on 3daef2c8ee4df2, where
saturared math is used for overflow case.
Checked on i686-linux-gnu.
[BZ #21014]
* sysdeps/i386/i686/multiarch/memchr-sse2-bsf.S (MEMCHR): Avoid
overflow
in pointer addition.
* sysdeps/i386/i686/multiarch/memchr-sse2.S (MEMCHR): Likewise.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 7 +++++++
sysdeps/i386/i686/multiarch/memchr-sse2-bsf.S | 10 ++++++++--
sysdeps/i386/i686/multiarch/memchr-sse2.S | 8 +++++++-
3 files changed, 22 insertions(+), 3 deletions(-)
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