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Message-Id: <1376692475-28413-74-git-send-email-kamal@canonical.com> Date: Fri, 16 Aug 2013 15:33:35 -0700 From: Kamal Mostafa <kamal@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Russell King <rmk+kernel@....linux.org.uk>, Kamal Mostafa <kamal@...onical.com> Subject: [PATCH 073/133] ARM: poison memory between kuser helpers 3.8.13.7 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Russell King <rmk+kernel@....linux.org.uk> commit 5b43e7a383d69381ffe53423e46dd0fafae07da3 upstream. Poison the memory between each kuser helper. This ensures that any branch between the kuser helpers will be appropriately trapped. Acked-by: Nicolas Pitre <nico@...aro.org> Signed-off-by: Russell King <rmk+kernel@....linux.org.uk> Signed-off-by: Kamal Mostafa <kamal@...onical.com> --- arch/arm/kernel/entry-armv.S | 25 ++++++++++++++++--------- 1 file changed, 16 insertions(+), 9 deletions(-) diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index 0f82098..9c80c1d 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -784,6 +784,17 @@ ENDPROC(__switch_to) #endif .endm + .macro kuser_pad, sym, size + .if (. - \sym) & 3 + .rept 4 - (. - \sym) & 3 + .byte 0 + .endr + .endif + .rept (\size - (. - \sym)) / 4 + .word 0xe7fddef1 + .endr + .endm + .align 5 .globl __kuser_helper_start __kuser_helper_start: @@ -874,18 +885,13 @@ kuser_cmpxchg64_fixup: #error "incoherent kernel configuration" #endif - /* pad to next slot */ - .rept (16 - (. - __kuser_cmpxchg64)/4) - .word 0 - .endr - - .align 5 + kuser_pad __kuser_cmpxchg64, 64 __kuser_memory_barrier: @ 0xffff0fa0 smp_dmb arm usr_ret lr - .align 5 + kuser_pad __kuser_memory_barrier, 32 __kuser_cmpxchg: @ 0xffff0fc0 @@ -958,13 +964,14 @@ kuser_cmpxchg32_fixup: #endif - .align 5 + kuser_pad __kuser_cmpxchg, 32 __kuser_get_tls: @ 0xffff0fe0 ldr r0, [pc, #(16 - 8)] @ read TLS, set in kuser_get_tls_init usr_ret lr mrc p15, 0, r0, c13, c0, 3 @ 0xffff0fe8 hardware TLS code - .rep 4 + kuser_pad __kuser_get_tls, 16 + .rep 3 .word 0 @ 0xffff0ff0 software TLS value, then .endr @ pad up to __kuser_helper_version -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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