[PATCH bpf 0/2] bpf, fix for subprogs with tailcalls
flat view
STALE1938d
SUPERSEDED
From: John Fastabend <john.fastabend@gmail.com>
Date: 2021-06-30 19:41:06
Also in:
bpf
Subsystem:
bpf jit for x86 64-bit, bpf [core], bpf [general] (safe dynamic programs and tools), bpf [selftests] (test runners & infrastructure), kernel selftest framework, the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Shuah Khan, Shuah Khan, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Status: Superseded by v2 (posted 2021-07-07). [go to v2]
Revision v1 (2 revisions archived).
Revisions (2)
- v1 current
- v2 [diff against previous]
This fixes a use-after-free when using subprogs and tailcalls and adds
a test case to trigger the use-after-free.
John Fastabend (2):
bpf: track subprog poke correctly, fix use-after-free
bpf: selftest to verify mixing bpf2bpf calls and tailcalls with insn
patch
arch/x86/net/bpf_jit_comp.c | 4 ++
include/linux/bpf.h | 1 +
kernel/bpf/core.c | 7 +++-
kernel/bpf/verifier.c | 39 ++++---------------
.../selftests/bpf/prog_tests/tailcalls.c | 36 ++++++++++++-----
.../selftests/bpf/progs/tailcall_bpf2bpf4.c | 21 +++++++++-
6 files changed, 64 insertions(+), 44 deletions(-)
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2.25.1