Commit 79042f08 authored by Catalin Marinas's avatar Catalin Marinas Committed by Russell King
Browse files

[PATCH] ARM: 2698/1: Enable kernel r/w access to user pages on ARMv6



Patch from Catalin Marinas

cpu_v6_set_pte() sets the kernel access rights to r/o for user
pages (L_PTE_USER) when neither L_PTE_WRITE nor L_PTE_DIRTY are
set. This causes a kernel data abort when writing the TLS value
in the 0xffff0000 page. This patch enables the kernel r/w access.

Signed-off-by: Catalin Marinas
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 5932ae3f
......@@ -132,8 +132,8 @@ ENTRY(cpu_v6_switch_mm)
* 100x 1 0 1 r/o no acc
* 10x0 1 0 1 r/o no acc
* 1011 0 0 1 r/w no acc
* 110x 1 1 0 r/o r/o
* 11x0 1 1 0 r/o r/o
* 110x 0 1 0 r/w r/o
* 11x0 0 1 0 r/w r/o
* 1111 0 1 1 r/w r/w
*/
ENTRY(cpu_v6_set_pte)
......@@ -150,7 +150,7 @@ ENTRY(cpu_v6_set_pte)
tst r1, #L_PTE_USER
orrne r2, r2, #AP1 | nG
tstne r2, #APX
eorne r2, r2, #AP0
bicne r2, r2, #APX | AP0
tst r1, #L_PTE_YOUNG
biceq r2, r2, #APX | AP1 | AP0
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment