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ARM: 8731/1: Fix csum_partial_copy_from_user() stack mismatch 

[ Upstream commit 36b0cb84ee ]

An additional 'ip' will be pushed to the stack, for restoring the
DACR later, if CONFIG_CPU_SW_DOMAIN_PAN defined.

However, the fixup still get the err_ptr by add #8*4 to sp, which
results in the fact that the code area pointed by the LR will be
overwritten, or the kernel will crash if CONFIG_DEBUG_RODATA is enabled.

This patch fixes the stack mismatch.

Fixes: a5e090acbf ("ARM: software-based priviledged-no-access support")
Signed-off-by: Lvqiang Huang <Lvqiang.Huang@spreadtrum.com>
Signed-off-by: Chunyan Zhang <zhang.lyra@gmail.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunyan Zhang 2017-12-01 03:51:04 +01:00 committed by Greg Kroah-Hartman
parent ae3471f65a
commit ba9443c55f
1 changed files with 4 additions and 0 deletions
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4
arch/arm/lib/csumpartialcopyuser.S
View File

@ -85,7 +85,11 @@
.pushsection .text.fixup,"ax"
.align 4
9001: mov r4, #-EFAULT
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
ldr r5, [sp, #9*4] @ *err_ptr
#else
ldr r5, [sp, #8*4] @ *err_ptr
#endif
str r4, [r5]
ldmia sp, {r1, r2} @ retrieve dst, len
add r2, r2, r1