diff options
Diffstat (limited to 'meta/recipes-core/glibc/glibc/CVE-2021-33574_1.patch')
| -rw-r--r-- | meta/recipes-core/glibc/glibc/CVE-2021-33574_1.patch | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/meta/recipes-core/glibc/glibc/CVE-2021-33574_1.patch b/meta/recipes-core/glibc/glibc/CVE-2021-33574_1.patch new file mode 100644 index 0000000000..7561e87121 --- /dev/null +++ b/meta/recipes-core/glibc/glibc/CVE-2021-33574_1.patch @@ -0,0 +1,68 @@ +From 42d359350510506b87101cf77202fefcbfc790cb Mon Sep 17 00:00:00 2001 +From: Andreas Schwab <schwab@linux-m68k.org> +Date: Thu, 27 May 2021 12:49:47 +0200 +Subject: [PATCH] Use __pthread_attr_copy in mq_notify (bug 27896) + +Make a deep copy of the pthread attribute object to remove a potential +use-after-free issue. + +Upstream-Status: Backport +CVE: CVE-2021-33574 patch#1 +Signed-off-by: Armin Kuster <akuster@mvista.com> + +--- +diff --git a/NEWS b/NEWS +index 8a20d3c4e3..be489243ac 100644 +--- a/NEWS ++++ b/NEWS +@@ -7,6 +7,10 @@ using `glibc' in the "product" field. + + Version 2.31.1 + ++ CVE-2021-33574: The mq_notify function has a potential use-after-free ++ issue when using a notification type of SIGEV_THREAD and a thread ++ attribute with a non-default affinity mask. ++ + The following bugs are resolved with this release: + [14231] stdio-common tests memory requirements + [19519] iconv(1) with -c option hangs on illegal multi-byte sequences +diff --git a/sysdeps/unix/sysv/linux/mq_notify.c b/sysdeps/unix/sysv/linux/mq_notify.c +index f288bac477..dd47f0b777 100644 +--- a/sysdeps/unix/sysv/linux/mq_notify.c ++++ b/sysdeps/unix/sysv/linux/mq_notify.c +@@ -135,8 +135,11 @@ helper_thread (void *arg) + (void) __pthread_barrier_wait (¬ify_barrier); + } + else if (data.raw[NOTIFY_COOKIE_LEN - 1] == NOTIFY_REMOVED) +- /* The only state we keep is the copy of the thread attributes. */ +- free (data.attr); ++ { ++ /* The only state we keep is the copy of the thread attributes. */ ++ pthread_attr_destroy (data.attr); ++ free (data.attr); ++ } + } + return NULL; + } +@@ -257,8 +260,7 @@ mq_notify (mqd_t mqdes, const struct sigevent *notification) + if (data.attr == NULL) + return -1; + +- memcpy (data.attr, notification->sigev_notify_attributes, +- sizeof (pthread_attr_t)); ++ __pthread_attr_copy (data.attr, notification->sigev_notify_attributes); + } + + /* Construct the new request. */ +@@ -272,7 +274,10 @@ mq_notify (mqd_t mqdes, const struct sigevent *notification) + + /* If it failed, free the allocated memory. */ + if (__glibc_unlikely (retval != 0)) +- free (data.attr); ++ { ++ pthread_attr_destroy (data.attr); ++ free (data.attr); ++ } + + return retval; + } |