linux-kernel - [PATCH AUTOSEL 4.19 28/29] modules: always page-align module section allocations

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-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190829105009.2265-28-sashal@kernel.org>
Date:   Thu, 29 Aug 2019 06:50:08 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jessica Yu <jeyu@...nel.org>, Martin Kaiser <lists@...ser.cx>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        David Lechner <david@...hnology.com>,
        Martin Kaiser <martin@...ser.cx>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 28/29] modules: always page-align module section allocations

From: Jessica Yu <jeyu@...nel.org>

[ Upstream commit 38f054d549a869f22a02224cd276a27bf14b6171 ]

Some arches (e.g., arm64, x86) have moved towards non-executable
module_alloc() allocations for security hardening reasons. That means
that the module loader will need to set the text section of a module to
executable, regardless of whether or not CONFIG_STRICT_MODULE_RWX is set.

When CONFIG_STRICT_MODULE_RWX=y, module section allocations are always
page-aligned to handle memory rwx permissions. On some arches with
CONFIG_STRICT_MODULE_RWX=n however, when setting the module text to
executable, the BUG_ON() in frob_text() gets triggered since module
section allocations are not page-aligned when CONFIG_STRICT_MODULE_RWX=n.
Since the set_memory_* API works with pages, and since we need to call
set_memory_x() regardless of whether CONFIG_STRICT_MODULE_RWX is set, we
might as well page-align all module section allocations for ease of
managing rwx permissions of module sections (text, rodata, etc).

Fixes: 2eef1399a866 ("modules: fix BUG when load module with rodata=n")
Reported-by: Martin Kaiser <lists@...ser.cx>
Reported-by: Bartosz Golaszewski <brgl@...ev.pl>
Tested-by: David Lechner <david@...hnology.com>
Tested-by: Martin Kaiser <martin@...ser.cx>
Tested-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
Signed-off-by: Jessica Yu <jeyu@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/module.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/kernel/module.c b/kernel/module.c
index 3fda10c549a25..2dec3d4a9b627 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -76,14 +76,9 @@

 /*
  * Modules' sections will be aligned on page boundaries
- * to ensure complete separation of code and data, but
- * only when CONFIG_STRICT_MODULE_RWX=y
+ * to ensure complete separation of code and data
  */
-#ifdef CONFIG_STRICT_MODULE_RWX
 # define debug_align(X) ALIGN(X, PAGE_SIZE)
-#else
-# define debug_align(X) (X)
-#endif

 /* If this is set, the section belongs in the init part of the module */
 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
-- 
2.20.1