Daniel Borkmann 04514d1322 bpf: guarantee r1 to be ctx in case of bpf_helper_changes_pkt_data ...

Some JITs don't cache skb context on stack in prologue, so when
LD_ABS/IND is used and helper calls yield bpf_helper_changes_pkt_data()
as true, then they temporarily save/restore skb pointer. However,
the assumption that skb always has to be in r1 is a bit of a
gamble. Right now it turned out to be true for all helpers listed
in bpf_helper_changes_pkt_data(), but lets enforce that from verifier
side, so that we make this a guarantee and bail out if the func
proto is misconfigured in future helpers.

In case of BPF helper calls from cBPF, bpf_helper_changes_pkt_data()
is completely unrelevant here (since cBPF is context read-only) and
therefore always false.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

2017-12-15 09:19:35 -08:00

..

arraymap.c

perf/bpf: Extend the perf_event_read_local() interface, a.k.a. "bpf: perf event change needed for subsequent bpf helpers"

2017-10-27 10:31:56 +02:00

bpf_lru_list.c

bpf: lru: Lower the PERCPU_NR_SCANS from 16 to 4

2017-04-17 13:55:52 -04:00

bpf_lru_list.h

bpf: Only set node->ref = 1 if it has not been set

2017-09-01 09:57:39 -07:00

cgroup.c

bpf, cgroup: implement eBPF-based device controller for cgroup v2

2017-11-05 23:26:51 +09:00

core.c

bpf: set maximum number of attached progs to 64 for a single perf tp

2017-12-01 02:56:10 +01:00

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

bpf: rename ARG_PTR_TO_STACK

2017-01-09 16:56:27 -05:00

inode.c

bpf: Add file mode configuration into bpf maps

2017-10-20 13:32:59 +01:00

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

bpf: Add syscall lookup support for fd array and htab

2017-06-29 13:13:25 -04:00

map_in_map.h

bpf: Add syscall lookup support for fd array and htab

2017-06-29 13:13:25 -04:00

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

bpf: introduce percpu_freelist

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

sockmap.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

2017-11-02 15:23:39 +09:00

stackmap.c

bpf: Add file mode configuration into bpf maps

2017-10-20 13:32:59 +01:00

syscall.c

bpf: revert report offload info to user space

2017-11-21 00:37:35 +01:00

tnum.c

bpf/verifier: track signed and unsigned min/max values

2017-08-08 17:51:34 -07:00

verifier.c

bpf: guarantee r1 to be ctx in case of bpf_helper_changes_pkt_data

2017-12-15 09:19:35 -08:00