arm64: dump: Add checking for writable and exectuable pages

Browse source

Page mappings with full RWX permissions are a security risk. x86
has an option to walk the page tables and dump any bad pages.
(See e1a58320a3 ("x86/mm: Warn on W^X mappings")). Add a similar
implementation for arm64.

Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Laura Abbott <labbott@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
[catalin.marinas@arm.com: folded fix for KASan out of bounds from Mark Rutland]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

...

This commit is contained in:

Laura Abbott 2016-10-27 09:27:34 -07:00 • committed by Catalin Marinas

parent cfd69e9551

commit 1404d6f13e

4 changed files with 94 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

29

arch/arm64/Kconfig.debug

View file

8

arch/arm64/include/asm/ptdump.h

View file

54

arch/arm64/mm/dump.c

View file

3

arch/arm64/mm/mmu.c

View file