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Use __pthread_attr_copy in mq_notify (bug 27896)

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Make a deep copy of the pthread attribute object to remove a potential
use-after-free issue.
This commit is contained in:
Andreas Schwab 2021-05-27 12:49:47 +02:00
parent 858045ad1c
commit 42d3593505
2 changed files with 14 additions and 5 deletions
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4
NEWS
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@ -62,6 +62,10 @@ Security related changes:
potentially resulting in degraded service or Denial of Service on the
local system. Reported by Chris Schanzle.
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:
[The release manager will add the list generated by

15
sysdeps/unix/sysv/linux/mq_notify.c
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@ -133,8 +133,11 @@ helper_thread (void *arg)
(void) __pthread_barrier_wait (&notify_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;
}
@ -255,8 +258,7 @@ 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. */
@ -270,7 +272,10 @@ 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;
}