path: root/kernel/bpf/helpers.c
diff options
authorDaniel Borkmann <>2015-10-08 01:20:39 +0200
committerDavid S. Miller <>2015-10-08 05:26:39 -0700
commit3ad0040573b0c00f88488bc31958acd07a55ee2e (patch)
tree3afa13e8acbdf49a9f8c1a7993065c3836997a01 /kernel/bpf/helpers.c
parent897ece56e714a2cc64e6914cb89a362d7021b36e (diff)
bpf: split state from prandom_u32() and consolidate {c, e}BPF prngs
While recently arguing on a seccomp discussion that raw prandom_u32() access shouldn't be exposed to unpriviledged user space, I forgot the fact that SKF_AD_RANDOM extension actually already does it for some time in cBPF via commit 4cd3675ebf74 ("filter: added BPF random opcode"). Since prandom_u32() is being used in a lot of critical networking code, lets be more conservative and split their states. Furthermore, consolidate eBPF and cBPF prandom handlers to use the new internal PRNG. For eBPF, bpf_get_prandom_u32() was only accessible for priviledged users, but should that change one day, we also don't want to leak raw sequences through things like eBPF maps. One thought was also to have own per bpf_prog states, but due to ABI reasons this is not easily possible, i.e. the program code currently cannot access bpf_prog itself, and copying the rnd_state to/from the stack scratch space whenever a program uses the prng seems not really worth the trouble and seems too hacky. If needed, taus113 could in such cases be implemented within eBPF using a map entry to keep the state space, or get_random_bytes() could become a second helper in cases where performance would not be critical. Both sides can trigger a one-time late init via prandom_init_once() on the shared state. Performance-wise, there should even be a tiny gain as bpf_user_rnd_u32() saves one function call. The PRNG needs to live inside the BPF core since kernels could have a NET-less config as well. Signed-off-by: Daniel Borkmann <> Acked-by: Hannes Frederic Sowa <> Acked-by: Alexei Starovoitov <> Cc: Chema Gonzalez <> Signed-off-by: David S. Miller <>
Diffstat (limited to 'kernel/bpf/helpers.c')
1 files changed, 1 insertions, 6 deletions
diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index 1447ec09421e..4504ca66118d 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -93,13 +93,8 @@ const struct bpf_func_proto bpf_map_delete_elem_proto = {
.arg2_type = ARG_PTR_TO_MAP_KEY,
-static u64 bpf_get_prandom_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5)
- return prandom_u32();
const struct bpf_func_proto bpf_get_prandom_u32_proto = {
- .func = bpf_get_prandom_u32,
+ .func = bpf_user_rnd_u32,
.gpl_only = false,
.ret_type = RET_INTEGER,