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glibc: Security fix for CVE-2021-38604

Browse Source 
Source: glibc.org
MR: 112635
Type: Security Fix
Disposition: Backport from https://sourceware.org/git/?p=glibc.git;a=commit;h=b805aebd42364fe696e417808a700fdb9800c9e8
ChangeID: 53b105da48e604f6763bb04b7114f41bfb620d2f
Description:

(From OE-Core rev: f65b5b7c88092cdba0239939fead20992eb2ff48)

Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Armin Kuster
2021-08-19 22:27:27 -07:00
committed by Richard Purdie
parent e2cb601ab6
commit ef3c563a4f
2 changed files with 42 additions and 0 deletions
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41
meta/recipes-core/glibc/glibc/CVE-2021-38604.patch Normal file
View File

@@ -0,0 +1,41 @@
From b805aebd42364fe696e417808a700fdb9800c9e8 Mon Sep 17 00:00:00 2001
From: Nikita Popov <npv1310@gmail.com>
Date: Mon, 9 Aug 2021 20:17:34 +0530
Subject: [PATCH] librt: fix NULL pointer dereference (bug 28213)
Helper thread frees copied attribute on NOTIFY_REMOVED message
received from the OS kernel. Unfortunately, it fails to check whether
copied attribute actually exists (data.attr != NULL). This worked
earlier because free() checks passed pointer before actually
attempting to release corresponding memory. But
__pthread_attr_destroy assumes pointer is not NULL.
So passing NULL pointer to __pthread_attr_destroy will result in
segmentation fault. This scenario is possible if
notification->sigev_notify_attributes == NULL (which means default
thread attributes should be used).
Signed-off-by: Nikita Popov <npv1310@gmail.com>
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Upstream-Status: Backport
CVE: CVE-2021-38604
Signed-off-by: Armin Kuser <akuster@mvista.com>
---
sysdeps/unix/sysv/linux/mq_notify.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: git/sysdeps/unix/sysv/linux/mq_notify.c
===================================================================
--- git.orig/sysdeps/unix/sysv/linux/mq_notify.c
+++ git/sysdeps/unix/sysv/linux/mq_notify.c
@@ -134,7 +134,7 @@ helper_thread (void *arg)
to wait until it is done with it. */
(void) __pthread_barrier_wait (&notify_barrier);
}
- else if (data.raw[NOTIFY_COOKIE_LEN - 1] == NOTIFY_REMOVED)
+ else if (data.raw[NOTIFY_COOKIE_LEN - 1] == NOTIFY_REMOVED && data.attr != NULL)
{
/* The only state we keep is the copy of the thread attributes. */
pthread_attr_destroy (data.attr);

1
meta/recipes-core/glibc/glibc_2.31.bb
View File

@@ -69,6 +69,7 @@ SRC_URI = "${GLIBC_GIT_URI};branch=${SRCBRANCH};name=glibc \
file://CVE-2020-29573.patch \
file://CVE-2021-33574_1.patch \
file://CVE-2021-33574_2.patch \
file://CVE-2021-38604.patch \
"
S = "${WORKDIR}/git"
B = "${WORKDIR}/build-${TARGET_SYS}"