Yonghong Song 2310035fa0 bpf: fix incorrect kmalloc usage in lpm_trie MAP_GET_NEXT_KEY rcu region ...

In commit b471f2f1de ("bpf: implement MAP_GET_NEXT_KEY command for LPM_TRIE map"),
the implemented MAP_GET_NEXT_KEY callback function is guarded with rcu read lock.
In the function body, "kmalloc(size, GFP_USER | __GFP_NOWARN)" is used which may
sleep and violate rcu read lock region requirements. This patch fixed the issue
by using GFP_ATOMIC instead to avoid blocking kmalloc. Tested with
CONFIG_DEBUG_ATOMIC_SLEEP=y as suggested by Eric Dumazet.

Fixes: b471f2f1de ("bpf: implement MAP_GET_NEXT_KEY command for LPM_TRIE map")
Signed-off-by: Yonghong Song <yhs@fb.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

2018-01-23 17:33:57 +01:00

..

arraymap.c

bpf: arraymap: use bpf_map_init_from_attr()

2018-01-18 22:54:25 +01:00

bpf_lru_list.c

bpf: lru: Lower the PERCPU_NR_SCANS from 16 to 4

2017-04-17 13:55:52 -04:00

bpf_lru_list.h

bpf: Only set node->ref = 1 if it has not been set

2017-09-01 09:57:39 -07:00

cgroup.c

bpf/cgroup: fix a verification error for a CGROUP_DEVICE type prog

2017-12-19 01:43:29 +01:00

core.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

2018-01-20 22:03:46 -05:00

cpumap.c

bpf: cpumap: make some functions static

2018-01-17 00:12:58 +01:00

devmap.c

bpf: add helper for copying attrs to struct bpf_map

2018-01-14 23:36:29 +01:00

disasm.c

bpf: allow for correlation of maps and helpers in dump

2017-12-20 18:09:40 -08:00

disasm.h

bpf: annotate bpf_insn_print_t with __printf

2018-01-17 01:15:05 +01:00

hashtab.c

bpf: add helper for copying attrs to struct bpf_map

2018-01-14 23:36:29 +01:00

helpers.c

bpf: rename ARG_PTR_TO_STACK

2017-01-09 16:56:27 -05:00

inode.c

fix "netfilter: xt_bpf: Fix XT_BPF_MODE_FD_PINNED mode of 'xt_bpf_info_v1'"

2018-01-05 11:43:39 -05:00

lpm_trie.c

bpf: fix incorrect kmalloc usage in lpm_trie MAP_GET_NEXT_KEY rcu region

2018-01-23 17:33:57 +01:00

Makefile

bpf: only build sockmap with CONFIG_INET

2018-01-04 19:01:14 +01:00

map_in_map.c

bpf: Add syscall lookup support for fd array and htab

2017-06-29 13:13:25 -04:00

map_in_map.h

bpf: Add syscall lookup support for fd array and htab

2017-06-29 13:13:25 -04:00

offload.c

bpf: offload: report device information about offloaded maps

2018-01-18 22:54:25 +01:00

percpu_freelist.c

bpf: fix lockdep splat

2017-11-15 19:46:32 +09:00

percpu_freelist.h

bpf: introduce percpu_freelist

2016-03-08 15:28:31 -05:00

sockmap.c

bpf: add helper for copying attrs to struct bpf_map

2018-01-14 23:36:29 +01:00

stackmap.c

bpf: add helper for copying attrs to struct bpf_map

2018-01-14 23:36:29 +01:00

syscall.c

bpf: offload: report device information about offloaded maps

2018-01-18 22:54:25 +01:00

tnum.c

bpf/verifier: track signed and unsigned min/max values

2017-08-08 17:51:34 -07:00

verifier.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

2018-01-20 22:03:46 -05:00