https://github.com/torvalds/linux
Revision fdfaf64e75397567257e1051931f9a3377360665 authored by Alexei Starovoitov on 10 March 2014, 22:56:51 UTC, committed by David S. Miller on 12 March 2014, 03:25:22 UTC
Commit a998d4342337 claimed to introduce negative offset support to x86 jit,
but it couldn't be working, since at the time of the execution
of LD+ABS or LD+IND instructions via call into
bpf_internal_load_pointer_neg_helper() the %edx (3rd argument of this func)
had junk value instead of access size in bytes (1 or 2 or 4).

Store size into %edx instead of %ecx (what original commit intended to do)

Fixes: a998d4342337 ("bpf jit: Let the x86 jit handle negative offsets")
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Cc: Jan Seiffert <kaffeemonster@googlemail.com>
Cc: Eric Dumazet <edumazet@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 20a599b
History
Tip revision: fdfaf64e75397567257e1051931f9a3377360665 authored by Alexei Starovoitov on 10 March 2014, 22:56:51 UTC
x86: bpf_jit: support negative offsets
Tip revision: fdfaf64
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