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| author |   Edward Cree <ecree@solarflare.com> | 2017-08-23 15:09:46 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-08-23 22:38:07 -0700 |
| commit | d893dc26e3f42e12ae75703c52cc6de5578ff1f5 (patch) | |
| tree | bc1f40ad9367a4462f4c917d722958b165bfeea6 /MAINTAINERS | |
| parent | gre: remove duplicated assignment of iph (diff) | |
| download | linux-dev-d893dc26e3f42e12ae75703c52cc6de5578ff1f5.tar.xz linux-dev-d893dc26e3f42e12ae75703c52cc6de5578ff1f5.zip | |
selftests/bpf: add a test for a bug in liveness-based pruning
Writes in straight-line code should not prevent reads from propagating
along jumps. With current verifier code, the jump from 3 to 5 does not
add a read mark on 3:R0 (because 5:R0 has a write mark), meaning that
the jump from 1 to 3 gets pruned as safe even though R0 is NOT_INIT.
Verifier output:
0: (61) r2 = *(u32 *)(r1 +0)
1: (35) if r2 >= 0x0 goto pc+1
R1=ctx(id=0,off=0,imm=0) R2=inv(id=0,umax_value=4294967295,var_off=(0x0; 0xffffffff)) R10=fp0
2: (b7) r0 = 0
3: (35) if r2 >= 0x0 goto pc+1
R0=inv0 R1=ctx(id=0,off=0,imm=0) R2=inv(id=0,umax_value=4294967295,var_off=(0x0; 0xffffffff)) R10=fp0
4: (b7) r0 = 0
5: (95) exit
from 3 to 5: safe
from 1 to 3: safe
processed 8 insns, stack depth 0
Signed-off-by: Edward Cree <ecree@solarflare.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'MAINTAINERS')
0 files changed, 0 insertions, 0 deletions