* Elimar Riesebieter <riesebie@lxtec.de> [2016-08-06 18:39 +0200]:
> Package: gcc-6
> Version: 6.1.1-11
> Severity: important
>
>
> Hi all,
>
> building a 4.4 Kernel with gcc-6 fails on arch ppc. Build with gcc-5 works fine.
> Kernel 4.7 builds fine with gcc-6. The faillog:
Attached patch provided by [0] fixes the build.
[0] https://bugzilla.kernel.org/show_bug.cgi?id=151651
Elimar
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/V\ L I N U X
/( )\ >Phear the Penguin<
^^-^^
From 1e407ee3b21f981140491d5b8a36422979ca246f Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Mon, 25 Apr 2016 09:19:17 -0700
Subject: [PATCH] powerpc/ptrace: Fix out of bounds array access warning
gcc-6 correctly warns about a out of bounds access
arch/powerpc/kernel/ptrace.c:407:24: warning: index 32 denotes an offset greater than size of 'u64[32][1] {aka long long unsigned int[32][1]}' [-Warray-bounds]
offsetof(struct thread_fp_state, fpr[32][0]));
^
check the end of array instead of beginning of next element to fix this
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Segher Boessenkool <segher@kernel.crashing.org>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
arch/powerpc/kernel/ptrace.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index 30a03c0..060b140 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -377,7 +377,7 @@ static int fpr_get(struct task_struct *target, const struct user_regset *regset,
#else
BUILD_BUG_ON(offsetof(struct thread_fp_state, fpscr) !=
- offsetof(struct thread_fp_state, fpr[32][0]));
+ offsetof(struct thread_fp_state, fpr[32]));
return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
&target->thread.fp_state, 0, -1);
@@ -405,7 +405,7 @@ static int fpr_set(struct task_struct *target, const struct user_regset *regset,
return 0;
#else
BUILD_BUG_ON(offsetof(struct thread_fp_state, fpscr) !=
- offsetof(struct thread_fp_state, fpr[32][0]));
+ offsetof(struct thread_fp_state, fpr[32]));
return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.fp_state, 0, -1);
--
2.8.1
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