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bash: fix CVE-2016-9401 

popd in bash might allow local users to bypass the restricted shell
and cause a use-after-free via a crafted address.

Porting patch from <https://ftp.gnu.org/pub/gnu/bash/bash-4.4-patches/
bash44-006> to solve CVE-2016-9401.

(From OE-Core rev: 6987b317d5ce8dc50a37ebba395aa8424bec358c)

Signed-off-by: Li Zhou <li.zhou@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Li Zhou 2017-02-13 10:53:24 +08:00 committed by Richard Purdie
parent 70907e352e
commit 1b2857a781
2 changed files with 51 additions and 0 deletions
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50
meta/recipes-extended/bash/bash/CVE-2016-9401.patch Normal file
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@ -0,0 +1,50 @@
From fa741771ed47b30547be63b5b5dbfb51977aca12 Mon Sep 17 00:00:00 2001
From: Chet Ramey <chet.ramey@case.edu>
Date: Fri, 20 Jan 2017 11:47:31 -0500
Subject: [PATCH] Bash-4.4 patch 6
Bug-Reference-URL:
https://lists.gnu.org/archive/html/bug-bash/2016-11/msg00116.html
Reference to upstream patch:
https://ftp.gnu.org/pub/gnu/bash/bash-4.4-patches/bash44-006
Bug-Description:
Out-of-range negative offsets to popd can cause the shell to crash attempting
to free an invalid memory block.
Upstream-Status: Backport
CVE: CVE-2016-9401
Signed-off-by: Li Zhou <li.zhou@windriver.com>
---
builtins/pushd.def | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/builtins/pushd.def b/builtins/pushd.def
index 9c6548f..8a13bae 100644
--- a/builtins/pushd.def
+++ b/builtins/pushd.def
@@ -359,7 +359,7 @@ popd_builtin (list)
break;
}
- if (which > directory_list_offset || (directory_list_offset == 0 && which == 0))
+ if (which > directory_list_offset || (which < -directory_list_offset) || (directory_list_offset == 0 && which == 0))
{
pushd_error (directory_list_offset, which_word ? which_word : "");
return (EXECUTION_FAILURE);
@@ -381,6 +381,11 @@ popd_builtin (list)
remove that directory from the list and shift the remainder
of the list into place. */
i = (direction == '+') ? directory_list_offset - which : which;
+ if (i < 0 || i > directory_list_offset)
+ {
+ pushd_error (directory_list_offset, which_word ? which_word : "");
+ return (EXECUTION_FAILURE);
+ }
free (pushd_directory_list[i]);
directory_list_offset--;
--
1.9.1

1
meta/recipes-extended/bash/bash_4.3.30.bb
View File

@ -30,6 +30,7 @@ SRC_URI = "${GNU_MIRROR}/bash/${BP}.tar.gz;name=tarball \
file://fix-run-builtins.patch \
file://0001-help-fix-printf-format-security-warning.patch \
file://fix-run-intl.patch \
file://CVE-2016-9401.patch \
"
SRC_URI[tarball.md5sum] = "a27b3ee9be83bd3ba448c0ff52b28447"