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f37a8cb84c
linux/kernel/bpf
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Daniel Borkmann f37a8cb84c bpf: reject stores into ctx via st and xadd 
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>
2018-01-16 15:04:58 -08:00
..
arraymap.c bpf, array: fix overflow in max_entries and undefined behavior in index_mask 2018-01-10 14:46:39 -08:00
bpf_lru_list.c
bpf_lru_list.h
cgroup.c bpf, cgroup: implement eBPF-based device controller for cgroup v2 2017-11-05 23:26:51 +09:00
core.c bpf: fix divides by zero 2018-01-14 09:03:43 -08:00
cpumap.c bpf: cpumap micro-optimization in cpu_map_enqueue 2017-11-02 16:13:14 +09:00
devmap.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-10-22 13:39:14 +01:00
disasm.c bpf: move instruction printing into a separate file 2017-10-10 12:30:16 -07:00
disasm.h bpf: move instruction printing into a separate file 2017-10-10 12:30:16 -07:00
hashtab.c bpf: add schedule points to map alloc/free 2017-12-12 15:27:22 -08:00
helpers.c
inode.c fix "netfilter: xt_bpf: Fix XT_BPF_MODE_FD_PINNED mode of 'xt_bpf_info_v1'" 2018-01-05 11:43:39 -05:00
lpm_trie.c bpf: Add file mode configuration into bpf maps 2017-10-20 13:32:59 +01:00
Makefile bpf: offload: add infrastructure for loading programs for a specific netdev 2017-11-05 22:26:18 +09:00
map_in_map.c
map_in_map.h
offload.c bpf: offload: add a license header 2017-11-27 22:24:51 +01:00
percpu_freelist.c bpf: fix lockdep splat 2017-11-15 19:46:32 +09:00
percpu_freelist.h
sockmap.c bpf: sockmap missing NULL psock check 2018-01-07 00:01:46 +01:00
stackmap.c bpf: Add file mode configuration into bpf maps 2017-10-20 13:32:59 +01:00
syscall.c fix "netfilter: xt_bpf: Fix XT_BPF_MODE_FD_PINNED mode of 'xt_bpf_info_v1'" 2018-01-05 11:43:39 -05:00
tnum.c
verifier.c bpf: reject stores into ctx via st and xadd 2018-01-16 15:04:58 -08:00