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| author |   Maciej Fijalkowski <maciej.fijalkowski@intel.com> | 2020-09-16 23:10:07 +0200 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2020-09-17 19:19:20 -0700 |
| commit | 7f6e4312e15a5c370e84eaa685879b6bdcc717e4 (patch) | |
| tree | 1fb4e72fb739c21f5d4165d9d175a5a960b9e520 /arch/x86/net | |
| parent | bpf: rename poke descriptor's 'ip' member to 'tailcall_target' (diff) | |
| download | linux-dev-7f6e4312e15a5c370e84eaa685879b6bdcc717e4.tar.xz linux-dev-7f6e4312e15a5c370e84eaa685879b6bdcc717e4.zip | |
bpf: Limit caller's stack depth 256 for subprogs with tailcalls
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>
Diffstat (limited to 'arch/x86/net')
0 files changed, 0 insertions, 0 deletions