This is a note to let you know that I've just added the patch titled
bpf: cpumap: use GFP_KERNEL instead of GFP_ATOMIC in __cpu_map_entry_alloc()
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bpf-cpumap-use-gfp_kernel-instead-of-gfp_atomic-in-__cpu_map_entry_alloc.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7fc17e909edfb9bf421ee04e981d3d474175c7c7 Mon Sep 17 00:00:00 2001
From: Jason Wang <jasowang@xxxxxxxxxx>
Date: Wed, 14 Feb 2018 22:17:34 +0800
Subject: bpf: cpumap: use GFP_KERNEL instead of GFP_ATOMIC in __cpu_map_entry_alloc()
From: Jason Wang <jasowang@xxxxxxxxxx>
commit 7fc17e909edfb9bf421ee04e981d3d474175c7c7 upstream.
There're several implications after commit 0bf7800f1799 ("ptr_ring:
try vmalloc() when kmalloc() fails") with the using of vmalloc() since
can't allow GFP_ATOMIC but mandate GFP_KERNEL. This will lead a WARN
since cpumap try to call with GFP_ATOMIC. Fortunately, entry
allocation of cpumap can only be done through syscall path which means
GFP_ATOMIC is not necessary, so fixing this by replacing GFP_ATOMIC
with GFP_KERNEL.
Reported-by: syzbot+1a240cdb1f4cc88819df@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 0bf7800f1799 ("ptr_ring: try vmalloc() when kmalloc() fails")
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Cc: akpm@xxxxxxxxxxxxxxxxxxxx
Cc: dhowells@xxxxxxxxxx
Cc: hannes@xxxxxxxxxxx
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
Acked-by: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/bpf/cpumap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/bpf/cpumap.c
+++ b/kernel/bpf/cpumap.c
@@ -339,7 +339,7 @@ static int cpu_map_kthread_run(void *dat
struct bpf_cpu_map_entry *__cpu_map_entry_alloc(u32 qsize, u32 cpu, int map_id)
{
- gfp_t gfp = GFP_ATOMIC|__GFP_NOWARN;
+ gfp_t gfp = GFP_KERNEL | __GFP_NOWARN;
struct bpf_cpu_map_entry *rcpu;
int numa, err;
Patches currently in stable-queue which might be from jasowang@xxxxxxxxxx are
queue-4.15/bpf-cpumap-use-gfp_kernel-instead-of-gfp_atomic-in-__cpu_map_entry_alloc.patch