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[Bug network/21115] sunrpc: Use-after-free in error path in clntudp_call
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Tue, 28 Feb 2017 16:35:41 +0000
- Subject: [Bug network/21115] sunrpc: Use-after-free in error path in clntudp_call
- Auto-submitted: auto-generated
- References: <bug-21115-131@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=21115
--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
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The branch, release/2.25/master has been updated
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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=045e368799cd253ddbf8bdec42ed92e8ebb3ce67
commit 045e368799cd253ddbf8bdec42ed92e8ebb3ce67
Author: Florian Weimer <fweimer@redhat.com>
Date: Tue Feb 28 17:05:46 2017 +0100
sunrpc: Avoid use-after-free read access in clntudp_call [BZ #21115]
After commit bc779a1a5b3035133024b21e2f339fe4219fb11c
(CVE-2016-4429: sunrpc: Do not use alloca in clntudp_call
[BZ #20112]), ancillary data is stored on the heap,
but it is accessed after it has been freed.
The test case must be run under a heap debugger such as valgrind
to observe the invalid access. A malloc implementation which
immediately calls munmap on free would catch this bug as well.
(cherry picked from commit d42eed4a044e5e10dfb885cf9891c2518a72a491)
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 8 ++++++
NEWS | 1 +
sunrpc/Makefile | 3 +-
sunrpc/clnt_udp.c | 2 +-
sunrpc/tst-udp-error.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 74 insertions(+), 2 deletions(-)
create mode 100644 sunrpc/tst-udp-error.c
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