74 lines
2.4 KiB
Diff
74 lines
2.4 KiB
Diff
From 42d359350510506b87101cf77202fefcbfc790cb Mon Sep 17 00:00:00 2001
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From: Andreas Schwab <schwab@linux-m68k.org>
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Date: Thu, 27 May 2021 12:49:47 +0200
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Subject: [PATCH] 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
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use-after-free issue.
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Conflict:NA
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Reference:https://sourceware.org/git/?p=glibc.git;a=commit;h=42d359350510506b87101cf77202fefcbfc790cb
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---
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NEWS | 4 ++++
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sysdeps/unix/sysv/linux/mq_notify.c | 15 ++++++++++-----
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2 files changed, 14 insertions(+), 5 deletions(-)
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diff --git a/NEWS b/NEWS
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index eb31aca6..9dff5e82 100644
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--- a/NEWS
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+++ b/NEWS
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@@ -224,6 +224,10 @@ Changes to build and runtime requirements:
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Security related changes:
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+ CVE-2021-33574: The mq_notify function has a potential use-after-free
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+ issue when using a notification type of SIGEV_THREAD and a thread
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+ attribute with a non-default affinity mask.
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+
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CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
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been fixed by removing the glibc-internal IDNA implementation and using
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the system-provided libidn2 library instead. Originally reported by Hanno
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diff --git a/sysdeps/unix/sysv/linux/mq_notify.c b/sysdeps/unix/sysv/linux/mq_notify.c
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index 3563e82c..c4091169 100644
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--- a/sysdeps/unix/sysv/linux/mq_notify.c
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+++ b/sysdeps/unix/sysv/linux/mq_notify.c
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@@ -135,8 +135,11 @@ helper_thread (void *arg)
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(void) __pthread_barrier_wait (¬ify_barrier);
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}
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else if (data.raw[NOTIFY_COOKIE_LEN - 1] == NOTIFY_REMOVED)
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- /* The only state we keep is the copy of the thread attributes. */
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- free (data.attr);
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+ {
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+ /* The only state we keep is the copy of the thread attributes. */
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+ pthread_attr_destroy (data.attr);
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+ free (data.attr);
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+ }
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}
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return NULL;
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}
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@@ -257,8 +260,7 @@ mq_notify (mqd_t mqdes, const struct sigevent *notification)
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if (data.attr == NULL)
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return -1;
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- memcpy (data.attr, notification->sigev_notify_attributes,
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- sizeof (pthread_attr_t));
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+ __pthread_attr_copy (data.attr, notification->sigev_notify_attributes);
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}
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/* Construct the new request. */
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@@ -272,7 +274,10 @@ mq_notify (mqd_t mqdes, const struct sigevent *notification)
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/* If it failed, free the allocated memory. */
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if (__glibc_unlikely (retval != 0))
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- free (data.attr);
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+ {
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+ pthread_attr_destroy (data.attr);
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+ free (data.attr);
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+ }
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return retval;
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}
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--
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2.23.0
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