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-rw-r--r--meta/recipes-core/glibc/glibc/0001-CVE-2021-38604.patch40
1 files changed, 40 insertions, 0 deletions
diff --git a/meta/recipes-core/glibc/glibc/0001-CVE-2021-38604.patch b/meta/recipes-core/glibc/glibc/0001-CVE-2021-38604.patch
new file mode 100644
index 0000000000..8a52ac957c
--- /dev/null
+++ b/meta/recipes-core/glibc/glibc/0001-CVE-2021-38604.patch
@@ -0,0 +1,40 @@
+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).
+
+Upstream-Status: Backport [https://sourceware.org/git/?p=glibc.git;a=commit;h=b805aebd42364fe696e417808a700fdb9800c9e8]
+CVE: CVE-2021-38604
+
+Signed-off-by: Nikita Popov <npv1310@gmail.com>
+Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
+Signed-off-by: Vinay Kumar <vinay.m.engg@gmail.com>
+---
+ sysdeps/unix/sysv/linux/mq_notify.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/sysdeps/unix/sysv/linux/mq_notify.c b/sysdeps/unix/sysv/linux/mq_notify.c
+index 6f46d29d1d..1714e1cc5f 100644
+--- a/sysdeps/unix/sysv/linux/mq_notify.c
++++ b/sysdeps/unix/sysv/linux/mq_notify.c
+@@ -132,7 +132,7 @@ 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);