diff options
| author | Philip Derrin <philip@cog.systems> | 2017-11-14 00:55:25 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-30 08:37:19 +0000 |
| commit | 5f8046f7c9e3049000bbe610c15390bf698d681e (patch) | |
| tree | 2c23cafc55056edd67d5d5033c18c0c18d1a09fc /arch/arm/mm/cache-uniphier.c | |
| parent | 29c4b6b4f46d4cc53b4f8c2b45e218ccfa1eea68 (diff) | |
ARM: 8722/1: mm: make STRICT_KERNEL_RWX effective for LPAE
commit 400eeffaffc7232c0ae1134fe04e14ae4fb48d8c upstream.
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>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm/mm/cache-uniphier.c')
0 files changed, 0 insertions, 0 deletions