lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <20240725125442.4957-1-dakr@kernel.org>
Date: Thu, 25 Jul 2024 14:54:37 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: akpm@...ux-foundation.org,
	urezki@...il.com,
	hch@...radead.org
Cc: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	Danilo Krummrich <dakr@...nel.org>
Subject: [PATCH] mm: (k)vrealloc: document concurrency restrictions

Document that concurrent calls to vrealloc() with itself or vfree() for
the same memory allocation are not permitted, since it leads to undefined
behavior.

Consequently, the same applies for kvrealloc(), hence also document it
for kvrealloc().

Suggested-by: Christoph Hellwig <hch@...radead.org>
Suggested-by: Uladzislau Rezki <urezki@...il.com>
Signed-off-by: Danilo Krummrich <dakr@...nel.org>
---
 mm/util.c    | 3 +++
 mm/vmalloc.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/mm/util.c b/mm/util.c
index 0ff5898cc6de..29ae93f6344f 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -732,6 +732,9 @@ EXPORT_SYMBOL(kvfree_sensitive);
  * If @p is %NULL, kvrealloc() behaves exactly like kvmalloc(). If @size is 0
  * and @p is not a %NULL pointer, the object pointed to is freed.
  *
+ * This function must not be called concurrently with itself or kvfree() for the
+ * same memory allocation.
+ *
  * Return: pointer to the allocated memory or %NULL in case of error
  */
 void *kvrealloc_noprof(const void *p, size_t size, gfp_t flags)
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index caf032f0bd69..2a6d4ce57b73 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -4049,6 +4049,9 @@ EXPORT_SYMBOL(vzalloc_node_noprof);
  * If @p is %NULL, vrealloc() behaves exactly like vmalloc(). If @size is 0 and
  * @p is not a %NULL pointer, the object pointed to is freed.
  *
+ * This function must not be called concurrently with itself or vfree() for the
+ * same memory allocation.
+ *
  * Return: pointer to the allocated memory; %NULL if @size is zero or in case of
  *         failure
  */

base-commit: d270beaca6818349b2aed7e6034b800a777087cc
-- 
2.45.2


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ