Daniel Borkmann f531fbb06a bpf: reject stores into ctx via st and xadd ...

[ upstream commit f37a8cb84c ]

Alexei found that verifier does not reject stores into context
via BPF_ST instead of BPF_STX. And while looking at it, we
also should not allow XADD variant of BPF_STX.

The context rewriter is only assuming either BPF_LDX_MEM- or
BPF_STX_MEM-type operations, thus reject anything other than
that so that assumptions in the rewriter properly hold. Add
test cases as well for BPF selftests.

Fixes: d691f9e8d4 ("bpf: allow programs to write to certain skb fields")
Reported-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2018-01-31 12:55:57 +01:00

..

arraymap.c

bpf, array: fix overflow in max_entries and undefined behavior in index_mask

2018-01-17 09:38:55 +01:00

core.c

bpf: fix divides by zero

2018-01-31 12:55:57 +01:00

hashtab.c

bpf: don't trigger OOM killer under pressure with map alloc

2017-07-05 14:40:21 +02:00

helpers.c

bpf: direct packet write and access for helpers for clsact progs

2016-09-20 23:32:11 -04:00

inode.c

fs: Replace CURRENT_TIME with current_time() for inode timestamps

2016-09-27 21:06:21 -04:00

Makefile

bpf: introduce percpu_freelist

2016-03-08 15:28:31 -05:00

percpu_freelist.c

bpf: fix lockdep splat

2017-12-14 09:28:23 +01:00

percpu_freelist.h

bpf: introduce percpu_freelist

2016-03-08 15:28:31 -05:00

stackmap.c

bpf: don't trigger OOM killer under pressure with map alloc

2017-07-05 14:40:21 +02:00

syscall.c

bpf: move fixup_bpf_calls() function

2018-01-17 09:38:55 +01:00

verifier.c

bpf: reject stores into ctx via st and xadd

2018-01-31 12:55:57 +01:00