linux/kernel/bpf
Stanislav Fomichev 0b698005a9 bpf: don't assume build-id length is always 20 bytes
Build-id length is not fixed to 20, it can be (`man ld` /--build-id):
  * 128-bit (uuid)
  * 160-bit (sha1)
  * any length specified in ld --build-id=0xhexstring

To fix the issue of missing BPF_STACK_BUILD_ID_VALID for shorter build-ids,
assume that build-id is somewhere in the range of 1 .. 20.
Set the remaining bytes to zero.

v2:
* don't introduce new "len = min(BPF_BUILD_ID_SIZE, nhdr->n_descsz)",
  we already know that nhdr->n_descsz <= BPF_BUILD_ID_SIZE if we enter
  this 'if' condition

Fixes: 615755a77b ("bpf: extend stackmap to save binary_build_id+offset instead of address")
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-01-17 16:42:35 +01:00
..
arraymap.c bpf: pass struct btf pointer to the map_check_btf() callback 2018-12-12 15:33:33 -08:00
bpf_lru_list.c
bpf_lru_list.h
btf.c bpf: fix bpffs bitfield pretty print 2019-01-11 10:40:54 +01:00
cgroup.c
core.c bpf: enable access to ax register also from verifier rewrite 2019-01-02 16:01:24 -08:00
cpumap.c bpf/cpumap: make sure frame_size for build_skb is aligned if headroom isn't 2018-12-20 23:19:12 +01:00
devmap.c bpf: devmap: fix wrong interface selection in notifier_call 2018-10-26 00:32:21 +02:00
disasm.c
disasm.h
hashtab.c bpf: allow zero-initializing hash map seed 2018-11-20 00:53:39 +01:00
helpers.c bpf: fix direct packet write into pop/peek helpers 2018-10-25 17:02:06 -07:00
inode.c
local_storage.c bpf: enable cgroup local storage map pretty print with kind_flag 2018-12-18 01:11:59 +01:00
lpm_trie.c bpf: pass struct btf pointer to the map_check_btf() callback 2018-12-12 15:33:33 -08:00
Makefile
map_in_map.c
map_in_map.h
offload.c bpf: fix null pointer dereference on pointer offload 2018-11-16 20:48:27 -08:00
percpu_freelist.c
percpu_freelist.h
queue_stack_maps.c bpf: fix integer overflow in queue_stack_map 2018-11-22 21:29:40 +01:00
reuseport_array.c
stackmap.c bpf: don't assume build-id length is always 20 bytes 2019-01-17 16:42:35 +01:00
syscall.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
tnum.c
verifier.c bpf: fix sanitation of alu op with pointer / scalar type from different paths 2019-01-05 21:32:38 -08:00
xskmap.c