diff options
| author | Philip Derrin <philip@cog.systems> | 2017-11-14 00:55:25 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2017-11-21 15:10:07 +0000 |
| commit | 400eeffaffc7232c0ae1134fe04e14ae4fb48d8c (patch) | |
| tree | a21d5b4f3044abb133eeb03cb12db8664b964abd /%3fh%3dv2.6.24-rc4&id%3d8bafae202c82dc257f649ea3c275a0f35ee15113?h=v2.6.24-rc4&id=400eeffaffc7232c0ae1134fe04e14ae4fb48d8c | |
| parent | 3b0c0c922ff4be275a8beb87ce5657d16f355b54 (diff) | |
ARM: 8722/1: mm: make STRICT_KERNEL_RWX effective for LPAE
Currently, for ARM kernels with CONFIG_ARM_LPAE and
CONFIG_STRICT_KERNEL_RWX enabled, the 2MiB pages mapping the
kernel code and rodata are writable. They are marked read-only in
a software bit (L_PMD_SECT_RDONLY) but the hardware read-only bit
is not set (PMD_SECT_AP2).
For user mappings, the logic that propagates the software bit
to the hardware bit is in set_pmd_at(); but for the kernel,
section_update() writes the PMDs directly, skipping this logic.
The fix is to set PMD_SECT_AP2 for read-only sections in
section_update(), at the same time as L_PMD_SECT_RDONLY.
Fixes: 1e3479225acb ("ARM: 8275/1: mm: fix PMD_SECT_RDONLY undeclared compile error")
Signed-off-by: Philip Derrin <philip@cog.systems>
Reported-by: Neil Dick <neil@cog.systems>
Tested-by: Neil Dick <neil@cog.systems>
Tested-by: Laura Abbott <labbott@redhat.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to '%3fh%3dv2.6.24-rc4&id%3d8bafae202c82dc257f649ea3c275a0f35ee15113?h=v2.6.24-rc4&id=400eeffaffc7232c0ae1134fe04e14ae4fb48d8c')
0 files changed, 0 insertions, 0 deletions