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| author | Chunyan Zhang <zhang.lyra@gmail.com> | 2017-12-01 03:51:04 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2017-12-17 23:20:39 +0100 |
| commit | 36b0cb84ee858f02c256d26f0cb4229c78e3399e (patch) | |
| tree | 93c6a8bf7411d87744c5d1e4fe685036b7bd9b33 /arch/arm/lib | |
| parent | Linux 4.15-rc2 (diff) | |
| download | linux-36b0cb84ee858f02c256d26f0cb4229c78e3399e.tar.xz linux-36b0cb84ee858f02c256d26f0cb4229c78e3399e.zip | |
ARM: 8731/1: Fix csum_partial_copy_from_user() stack mismatch
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: a5e090acbf54 ("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>
Diffstat (limited to 'arch/arm/lib')
| -rw-r--r-- | arch/arm/lib/csumpartialcopyuser.S | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/lib/csumpartialcopyuser.S b/arch/arm/lib/csumpartialcopyuser.S index 1712f132b80d..b83fdc06286a 100644 --- a/arch/arm/lib/csumpartialcopyuser.S +++ b/arch/arm/lib/csumpartialcopyuser.S @@ -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 |