linux-kernel - [tip:x86/debug] x86/asm/bpf: Create stack frames in bpf

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Date:	Wed, 24 Feb 2016 21:51:12 -0800
From:	tip-bot for Josh Poimboeuf <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	dvlasenk@...hat.com, bp@...en8.de, akpm@...ux-foundation.org,
	acme@...nel.org, peterz@...radead.org, bernd@...rovitsch.priv.at,
	mmarek@...e.cz, chris.j.arges@...onical.com,
	torvalds@...ux-foundation.org, mingo@...nel.org,
	tglx@...utronix.de, linux-kernel@...r.kernel.org,
	namhyung@...il.com, hpa@...or.com, luto@...capital.net,
	luto@...nel.org, jslaby@...e.cz, brgerst@...il.com,
	jpoimboe@...hat.com, palves@...hat.com, ast@...nel.org
Subject: [tip:x86/debug] x86/asm/bpf: Create stack frames in bpf_jit.S

Commit-ID:  d21001cc15ba9f63b0334d60942278587471a451
Gitweb:     http://git.kernel.org/tip/d21001cc15ba9f63b0334d60942278587471a451
Author:     Josh Poimboeuf <jpoimboe@...hat.com>
AuthorDate: Thu, 21 Jan 2016 16:49:27 -0600
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 24 Feb 2016 08:35:44 +0100

x86/asm/bpf: Create stack frames in bpf_jit.S

bpf_jit.S has several callable non-leaf functions which don't honor
CONFIG_FRAME_POINTER, which can result in bad stack traces.

Create a stack frame before the call instructions when
CONFIG_FRAME_POINTER is enabled.

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Acked-by: Alexei Starovoitov <ast@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Bernd Petrovitsch <bernd@...rovitsch.priv.at>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Chris J Arges <chris.j.arges@...onical.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Jiri Slaby <jslaby@...e.cz>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Michal Marek <mmarek@...e.cz>
Cc: Namhyung Kim <namhyung@...il.com>
Cc: Pedro Alves <palves@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: live-patching@...r.kernel.org
Cc: netdev@...r.kernel.org
Link: http://lkml.kernel.org/r/fa4c41976b438b51954cb8021f06bceb1d1d66cc.1453405861.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/net/bpf_jit.S | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/x86/net/bpf_jit.S b/arch/x86/net/bpf_jit.S
index eb4a3bd..f2a7faf 100644
--- a/arch/x86/net/bpf_jit.S
+++ b/arch/x86/net/bpf_jit.S
@@ -8,6 +8,7 @@
  * of the License.
  */
 #include <linux/linkage.h>
+#include <asm/frame.h>
 
 /*
  * Calling convention :
@@ -65,16 +66,18 @@ FUNC(sk_load_byte_positive_offset)
 
 /* rsi contains offset and can be scratched */
 #define bpf_slow_path_common(LEN)		\
+	lea	-MAX_BPF_STACK + 32(%rbp), %rdx;\
+	FRAME_BEGIN;				\
 	mov	%rbx, %rdi; /* arg1 == skb */	\
 	push	%r9;				\
 	push	SKBDATA;			\
 /* rsi already has offset */			\
 	mov	$LEN,%ecx;	/* len */	\
-	lea	- MAX_BPF_STACK + 32(%rbp),%rdx;			\
 	call	skb_copy_bits;			\
 	test    %eax,%eax;			\
 	pop	SKBDATA;			\
-	pop	%r9;
+	pop	%r9;				\
+	FRAME_END
 
 
 bpf_slow_path_word:
@@ -99,6 +102,7 @@ bpf_slow_path_byte:
 	ret
 
 #define sk_negative_common(SIZE)				\
+	FRAME_BEGIN;						\
 	mov	%rbx, %rdi; /* arg1 == skb */			\
 	push	%r9;						\
 	push	SKBDATA;					\
@@ -108,6 +112,7 @@ bpf_slow_path_byte:
 	test	%rax,%rax;					\
 	pop	SKBDATA;					\
 	pop	%r9;						\
+	FRAME_END;						\
 	jz	bpf_error
 
 bpf_slow_path_word_neg: