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| author | Kees Cook <keescook@chromium.org> | 2016-08-17 14:42:11 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-10-31 13:01:58 -0700 |
| commit | de54ebbe26bb371a6f1fbc0593372232f04e3107 (patch) | |
| tree | 41550879530d6752373feb43eba0d53f39a063a2 /lib/Kconfig.debug | |
| parent | 0cd340dcb05c4a43742fe156f36737bb2a321bfd (diff) | |
| download | linux-de54ebbe26bb371a6f1fbc0593372232f04e3107.tar.gz linux-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.debug | 10 |
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" |