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Message-Id: <1351557682-20983-4-git-send-email-keescook@chromium.org> Date: Mon, 29 Oct 2012 17:41:21 -0700 From: Kees Cook <keescook@...omium.org> To: linux-kernel@...r.kernel.org Cc: Russell King <linux@....linux.org.uk>, Will Deacon <will.deacon@....com>, Will Drewry <wad@...omium.org>, Geremy Condra <gcondra@...gle.com>, Kees Cook <keescook@...omium.org> Subject: [PATCH 3/4] arch/arm: allow a scno of -1 to not cause a SIGILL From: Will Drewry <wad@...omium.org> On tracehook-friendly platforms, a system call number of -1 falls through without running much code or taking much action. ARM is different. This adds a lightweight check to arm_syscall() to make sure that ARM behaves the same way. Signed-off-by: Will Drewry <wad@...omium.org> Signed-off-by: Kees Cook <keescook@...omium.org> --- arch/arm/kernel/traps.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index b0179b8..f303ea6 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -540,6 +540,10 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs) struct thread_info *thread = current_thread_info(); siginfo_t info; + /* Emulate/fallthrough. */ + if (no == -1) + return regs->ARM_r0; + if ((no >> 16) != (__ARM_NR_BASE>> 16)) return bad_syscall(no, regs); -- 1.7.9.5 -- 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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