linux-kernel - [PATCH 3.16 211/305] powerpc/bpf/jit: Disable classic BPF JIT on ppc64le

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <lsq.1471110171.994473294@decadent.org.uk>
Date:	Sat, 13 Aug 2016 18:42:51 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Thadeu Lima de Souza Cascardo" <cascardo@...hat.com>,
	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
	"Michael Ellerman" <mpe@...erman.id.au>
Subject: [PATCH 3.16 211/305] powerpc/bpf/jit: Disable classic BPF JIT on
 ppc64le

3.16.37-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>

commit 844e3be47693f92a108cb1fb3b0606bf25e9c7a6 upstream.

Classic BPF JIT was never ported completely to work on little endian
powerpc. However, it can be enabled and will crash the system when used.
As such, disable use of BPF JIT on ppc64le.

Fixes: 7c105b63bd98 ("powerpc: Add CONFIG_CPU_LITTLE_ENDIAN kernel config option.")
Reported-by: Thadeu Lima de Souza Cascardo <cascardo@...hat.com>
Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
Acked-by: Thadeu Lima de Souza Cascardo <cascardo@...hat.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
[bwh: Backported to 3.16: config symbol is BPF_JIT and also depends on PPC64]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/powerpc/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -124,7 +124,7 @@ config PPC
 	select IRQ_FORCED_THREADING
 	select HAVE_RCU_TABLE_FREE if SMP
 	select HAVE_SYSCALL_TRACEPOINTS
-	select HAVE_BPF_JIT if PPC64
+	select HAVE_BPF_JIT if PPC64 && CPU_BIG_ENDIAN
 	select HAVE_ARCH_JUMP_LABEL
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG
 	select GENERIC_SMP_IDLE_THREAD