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Date: Thu, 18 Feb 2016 18:48:16 -0500 From: David Long <dave.long@...aro.org> To: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will.deacon@....com>, Sandeepa Prabhu <sandeepa.s.prabhu@...il.com>, William Cohen <wcohen@...hat.com>, Pratyush Anand <panand@...hat.com>, Steve Capper <steve.capper@...aro.org>, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org Cc: Dave P Martin <Dave.Martin@....com>, Mark Rutland <mark.rutland@....com>, Marc Zyngier <marc.zyngier@....com>, Robin Murphy <Robin.Murphy@....com>, Ard Biesheuvel <ard.biesheuvel@...aro.org>, Jens Wiklander <jens.wiklander@...aro.org>, Christoffer Dall <christoffer.dall@...aro.org>, Alex Bennée <alex.bennee@...aro.org>, Yang Shi <yang.shi@...aro.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Viresh Kumar <viresh.kumar@...aro.org>, "Suzuki K. Poulose" <suzuki.poulose@....com>, Kees Cook <keescook@...omium.org>, Zi Shen Lim <zlim.lnx@...il.com>, John Blackwood <john.blackwood@...r.com>, Feng Kan <fkan@....com>, Balamurugan Shanmugam <bshanmugam@....com>, James Morse <james.morse@....com>, Vladimir Murzin <Vladimir.Murzin@....com>, Mark Salyzyn <salyzyn@...roid.com>, Petr Mladek <pmladek@...e.com>, Andrew Morton <akpm@...ux-foundation.org>, Mark Brown <broonie@...nel.org> Subject: [PATCH 3/8] arm64: add copy_to/from_user to kprobes blacklist From: "David A. Long" <dave.long@...aro.org> Currrently taking exceptions when accessing user data from a kprobe'd instruction doesn't work. Avoid this situation by blacklisting the relevant functions. Signed-off-by: David A. Long <dave.long@...aro.org> --- arch/arm64/lib/copy_from_user.S | 1 + arch/arm64/lib/copy_to_user.S | 1 + 2 files changed, 2 insertions(+) diff --git a/arch/arm64/lib/copy_from_user.S b/arch/arm64/lib/copy_from_user.S index 4699cd7..0ac2131 100644 --- a/arch/arm64/lib/copy_from_user.S +++ b/arch/arm64/lib/copy_from_user.S @@ -66,6 +66,7 @@ .endm end .req x5 + .section .kprobes.text,"ax",%progbits ENTRY(__copy_from_user) ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(0)), ARM64_HAS_PAN, \ CONFIG_ARM64_PAN) diff --git a/arch/arm64/lib/copy_to_user.S b/arch/arm64/lib/copy_to_user.S index 7512bbb..e4eb84c 100644 --- a/arch/arm64/lib/copy_to_user.S +++ b/arch/arm64/lib/copy_to_user.S @@ -65,6 +65,7 @@ .endm end .req x5 + .section .kprobes.text,"ax",%progbits ENTRY(__copy_to_user) ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(0)), ARM64_HAS_PAN, \ CONFIG_ARM64_PAN) -- 2.5.0
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