Maciej Fijalkowski 3a8d86d8da bpf: Limit caller's stack depth 256 for subprogs with tailcalls
[ Upstream commit 7f6e4312e15a5c370e84eaa685879b6bdcc717e4 ]

Protect against potential stack overflow that might happen when bpf2bpf
calls get combined with tailcalls. Limit the caller's stack depth for
such case down to 256 so that the worst case scenario would result in 8k
stack size (32 which is tailcall limit * 256 = 8k).

Suggested-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-10-29 09:58:06 +01:00
..
2020-09-17 13:47:56 +02:00
2019-05-28 17:46:43 -04:00
2020-01-17 19:48:42 +01:00
2020-03-25 08:25:58 +01:00
2019-05-24 20:16:01 +02:00
2020-01-09 10:19:54 +01:00
2019-07-08 19:36:47 -07:00
2019-07-08 19:36:47 -07:00