linux-kernel - [PATCH] bpf: explicitly memset the bpf

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Date:   Fri, 20 Mar 2020 10:48:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     Martin KaFai Lau <kafai@...com>, Song Liu <songliubraving@...com>,
        Yonghong Song <yhs@...com>, Andrii Nakryiko <andriin@...com>,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Maciej Żenczykowski <maze@...gle.com>,
        John Stultz <john.stultz@...aro.org>,
        Alexander Potapenko <glider@...gle.com>,
        Alistair Delva <adelva@...gle.com>
Subject: [PATCH] bpf: explicitly memset the bpf_attr structure

For the bpf syscall, we are relying on the compiler to properly zero out
the bpf_attr union that we copy userspace data into.  Unfortunately that
doesn't always work properly, padding and other oddities might not be
correctly zeroed, and in some tests odd things have been found when the
stack is pre-initialized to other values.

Fix this by explicitly memsetting the structure to 0 before using it.

Reported-by: Maciej Żenczykowski <maze@...gle.com>
Reported-by: John Stultz <john.stultz@...aro.org>
Reported-by: Alexander Potapenko <glider@...gle.com>
Reported-by: Alistair Delva <adelva@...gle.com>
Cc: stable <stable@...r.kernel.org>
Link: https://android-review.googlesource.com/c/kernel/common/+/1235490
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 kernel/bpf/syscall.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index a91ad518c050..a4b1de8ea409 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -3354,7 +3354,7 @@ static int bpf_map_do_batch(const union bpf_attr *attr,
 
 SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size)
 {
-	union bpf_attr attr = {};
+	union bpf_attr attr;
 	int err;
 
 	if (sysctl_unprivileged_bpf_disabled && !capable(CAP_SYS_ADMIN))
@@ -3366,6 +3366,7 @@ SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, siz
 	size = min_t(u32, size, sizeof(attr));
 
 	/* copy attributes from user space, may be less than sizeof(bpf_attr) */
+	memset(&attr, 0, sizeof(attr));
 	if (copy_from_user(&attr, uattr, size) != 0)
 		return -EFAULT;
 

base-commit: 6c90b86a745a446717fdf408c4a8a4631a5e8ee3
-- 
2.25.2