diff options
Diffstat (limited to 'meta/recipes-core/glibc/glibc/CVE-2021-33574_2.patch')
| -rw-r--r-- | meta/recipes-core/glibc/glibc/CVE-2021-33574_2.patch | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/meta/recipes-core/glibc/glibc/CVE-2021-33574_2.patch b/meta/recipes-core/glibc/glibc/CVE-2021-33574_2.patch new file mode 100644 index 0000000000..396cd7fc0e --- /dev/null +++ b/meta/recipes-core/glibc/glibc/CVE-2021-33574_2.patch @@ -0,0 +1,73 @@ +From 217b6dc298156bdb0d6aea9ea93e7e394a5ff091 Mon Sep 17 00:00:00 2001 +From: Florian Weimer <fweimer@redhat.com> +Date: Tue, 1 Jun 2021 17:51:41 +0200 +Subject: [PATCH] Fix use of __pthread_attr_copy in mq_notify (bug 27896) + +__pthread_attr_copy can fail and does not initialize the attribute +structure in that case. + +If __pthread_attr_copy is never called and there is no allocated +attribute, pthread_attr_destroy should not be called, otherwise +there is a null pointer dereference in rt/tst-mqueue6. + +Fixes commit 42d359350510506b87101cf77202fefcbfc790cb +("Use __pthread_attr_copy in mq_notify (bug 27896)"). + +Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org> + +https://sourceware.org/bugzilla/attachment.cgi?id=13497 + +Upstream-Status: Backport +CVE: CVE-2021-33574 patch#2 +Signed-off-by: Armin Kuster <akuster@mvista.com> + +--- +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 +@@ -260,7 +260,34 @@ mq_notify (mqd_t mqdes, const struct sig + if (data.attr == NULL) + return -1; + +- __pthread_attr_copy (data.attr, notification->sigev_notify_attributes); ++ memcpy (data.attr, notification->sigev_notify_attributes, ++ sizeof (pthread_attr_t)); ++ ++ struct pthread_attr *source = ++ (struct pthread_attr *) (notification->sigev_notify_attributes); ++ struct pthread_attr *target = (struct pthread_attr *) (data.attr); ++ cpu_set_t *newp; ++ cpu_set_t *cpuset = source->cpuset; ++ size_t cpusetsize = source->cpusetsize; ++ ++ /* alloc a new memory for cpuset to avoid use after free */ ++ if (cpuset != NULL && cpusetsize > 0) ++ { ++ newp = (cpu_set_t *) malloc (cpusetsize); ++ if (newp == NULL) ++ { ++ free(data.attr); ++ return -1; ++ } ++ ++ memcpy (newp, cpuset, cpusetsize); ++ target->cpuset = newp; ++ } ++ else ++ { ++ target->cpuset = NULL; ++ target->cpusetsize = 0; ++ } + } + + /* Construct the new request. */ +@@ -273,7 +300,7 @@ mq_notify (mqd_t mqdes, const struct sig + int retval = INLINE_SYSCALL (mq_notify, 2, mqdes, &se); + + /* If it failed, free the allocated memory. */ +- if (__glibc_unlikely (retval != 0)) ++ if (retval != 0 && data.attr != NULL) + { + pthread_attr_destroy (data.attr); + free (data.attr); |