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authorKees Cook <keescook@chromium.org>2016-08-18 00:42:11 +0300
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2016-10-31 23:01:58 +0300
commitde54ebbe26bb371a6f1fbc0593372232f04e3107 (patch)
tree41550879530d6752373feb43eba0d53f39a063a2 /lib/Kconfig.debug
parent0cd340dcb05c4a43742fe156f36737bb2a321bfd (diff)
downloadlinux-de54ebbe26bb371a6f1fbc0593372232f04e3107.tar.xz
bug: Provide toggle for BUG on data corruption
The kernel checks for cases of data structure corruption under some CONFIGs (e.g. CONFIG_DEBUG_LIST). When corruption is detected, some systems may want to BUG() immediately instead of letting the system run with known corruption. Usually these kinds of manipulation primitives can be used by security flaws to gain arbitrary memory write control. This provides a new config CONFIG_BUG_ON_DATA_CORRUPTION and a corresponding macro CHECK_DATA_CORRUPTION for handling these situations. Notably, even if not BUGing, the kernel should not continue processing the corrupted structure. This is inspired by similar hardening by Syed Rameez Mustafa in MSM kernels, and in PaX and Grsecurity, which is likely in response to earlier removal of the BUG calls in commit 924d9addb9b1 ("list debugging: use WARN() instead of BUG()"). Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Rik van Riel <riel@redhat.com>
Diffstat (limited to 'lib/Kconfig.debug')
-rw-r--r--lib/Kconfig.debug10
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 33bc56cf60d7..07a6fac930c5 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1960,6 +1960,16 @@ config TEST_STATIC_KEYS
If unsure, say N.
+config BUG_ON_DATA_CORRUPTION
+ bool "Trigger a BUG when data corruption is detected"
+ select CONFIG_DEBUG_LIST
+ help
+ Select this option if the kernel should BUG when it encounters
+ data corruption in kernel memory structures when they get checked
+ for validity.
+
+ If unsure, say N.
+
source "samples/Kconfig"
source "lib/Kconfig.kgdb"