Hao Luo 4976b718c3
bpf: Introduce pseudo_btf_id ...
Pseudo_btf_id is a type of ld_imm insn that associates a btf_id to a
ksym so that further dereferences on the ksym can use the BTF info
to validate accesses. Internally, when seeing a pseudo_btf_id ld insn,
the verifier reads the btf_id stored in the insn[0]'s imm field and
marks the dst_reg as PTR_TO_BTF_ID. The btf_id points to a VAR_KIND,
which is encoded in btf_vminux by pahole. If the VAR is not of a struct
type, the dst reg will be marked as PTR_TO_MEM instead of PTR_TO_BTF_ID
and the mem_size is resolved to the size of the VAR's type.
>From the VAR btf_id, the verifier can also read the address of the
ksym's corresponding kernel var from kallsyms and use that to fill
dst_reg.
Therefore, the proper functionality of pseudo_btf_id depends on (1)
kallsyms and (2) the encoding of kernel global VARs in pahole, which
should be available since pahole v1.18.
Signed-off-by: Hao Luo <haoluo@google.com >
Signed-off-by: Alexei Starovoitov <ast@kernel.org >
Acked-by: Andrii Nakryiko <andriin@fb.com >
Link: https://lore.kernel.org/bpf/20200929235049.2533242-2-haoluo@google.com
2020-10-02 14:59:25 -07:00
2020-07-23 09:35:36 +02:00
2020-07-15 20:34:11 -07:00
2019-11-05 12:44:34 +01:00
2020-01-21 11:41:36 +01:00
2020-05-28 11:22:14 +02:00
2020-09-09 11:21:19 -07:00
2019-10-04 14:25:17 -07:00
2020-05-04 11:30:15 -05:00
2019-10-04 14:25:17 -07:00
2019-10-04 14:25:17 -07:00
2020-07-21 22:05:32 -07:00
2020-06-15 16:03:38 +01:00
2020-05-01 16:08:19 -07:00
2020-08-12 10:57:59 -07:00
2019-12-18 18:07:31 +01:00
2020-07-13 17:01:44 -07:00
2020-07-21 11:21:44 -04:00
2020-08-12 10:58:00 -07:00
2020-06-26 10:36:30 +02:00
2020-06-26 10:37:11 +02:00
2020-07-25 07:38:21 -06:00
2020-07-08 16:16:19 +02:00
2020-10-02 14:59:25 -07:00
2020-01-10 17:20:07 +01:00
2020-07-27 12:55:37 +02:00
2020-07-27 12:55:43 +02:00
2019-11-05 12:44:34 +01:00
2020-07-19 20:14:42 +02:00
2019-10-07 07:55:17 -03:00
2019-10-01 17:19:41 -03:00
2019-10-09 22:31:14 -04:00
2020-06-17 00:07:38 +02:00
2019-09-25 17:51:39 -07:00
2020-03-26 15:10:44 +01:00
2019-11-15 14:38:29 +01:00
2019-10-28 13:41:01 -07:00
2020-09-29 13:58:41 -07:00
2020-05-04 11:30:15 -05:00
2020-03-03 11:10:21 -05:00
2020-04-27 16:29:41 +05:30
2019-12-17 21:37:40 +05:30
2020-08-12 10:57:59 -07:00
2020-07-19 19:20:22 -07:00
2020-09-22 16:45:34 -07:00
2020-09-19 16:54:35 -07:00
2020-07-27 23:24:00 +02:00
2020-06-24 21:34:11 +02:00
2020-05-14 16:44:25 +02:00
2020-05-12 19:34:57 +03:00
2020-05-12 19:34:52 +03:00
2020-06-05 16:19:28 -07:00
2020-04-20 15:45:41 -06:00
2020-07-06 21:37:08 -07:00
2020-05-28 22:09:47 -04:00
2020-05-19 09:34:18 -07:00
2019-10-23 14:26:37 +02:00
2019-11-05 18:20:55 -08:00
2020-04-30 17:51:42 -07:00
2020-06-05 20:19:20 +02:00
2020-07-12 10:22:01 +02:00
2020-08-27 08:01:47 -07:00
2019-12-11 15:31:52 +01:00
2020-07-27 12:20:40 -07:00
2020-07-23 17:55:20 +00:00
2020-07-19 19:20:22 -07:00
2020-07-24 17:12:41 -07:00
2020-08-05 19:02:07 +05:30
2020-05-04 11:30:15 -05:00
2019-12-26 13:09:37 -08:00
2020-09-23 13:24:34 -07:00
2020-04-27 11:40:25 -07:00
2020-09-17 17:58:13 -07:00
2020-03-16 01:42:31 -07:00
2020-08-22 12:44:37 -07:00
2020-05-01 12:24:40 -07:00
2020-07-13 15:32:56 -07:00
2020-04-20 12:43:24 -07:00
2020-07-24 17:12:41 -07:00
2020-08-27 07:55:59 -07:00
2020-09-03 15:17:28 -07:00
2020-06-30 12:06:49 -07:00
2019-12-13 15:00:36 -08:00
2020-07-24 12:53:31 -06:00
2020-06-30 11:49:21 +02:00
2020-03-29 22:30:57 -07:00
2020-07-27 16:34:12 +03:00
2020-01-04 13:55:09 -08:00
2020-05-19 15:19:06 +01:00
2020-07-15 13:27:34 -04:00
2020-09-11 13:22:52 -04:00
2020-09-29 13:26:36 -07:00
2020-05-21 08:20:35 -06:00
2020-03-29 22:30:57 -07:00
2020-05-27 11:10:05 +02:00
2020-08-12 10:57:59 -07:00
2020-07-19 18:05:49 -07:00
2020-03-20 09:01:16 +01:00
2020-05-06 17:45:45 -07:00
2020-04-02 09:35:30 -07:00
2020-07-09 12:38:41 -07:00
2020-09-10 12:25:51 -07:00
2020-07-14 13:46:42 -07:00
2019-11-15 14:38:29 +01:00
2020-07-25 19:34:47 -06:00
2020-06-24 14:36:33 -07:00
2020-05-04 11:30:15 -05:00
2020-03-29 22:32:36 -07:00
2020-03-18 16:35:48 -07:00
2020-04-30 17:51:42 -07:00
2020-05-22 14:00:38 -07:00
2020-07-13 17:20:49 -04:00
2020-07-13 17:52:46 -04:00
2020-09-18 14:06:20 +02:00
2019-11-06 06:17:38 +09:00
2020-01-18 09:19:18 -05:00
2020-08-03 15:17:48 -07:00
2020-02-20 22:44:30 -06:00
2020-04-02 17:57:10 +01:00
2020-08-03 14:51:09 -07:00
2019-10-02 20:32:27 -06:00
2020-07-24 15:23:31 -07:00
2020-06-29 17:08:28 -07:00
2019-12-01 14:00:59 -08:00
2019-10-23 17:23:47 +02:00
2020-01-28 10:09:51 +01:00
2020-05-21 17:04:07 -07:00
2020-04-30 15:19:33 +10:00
2020-07-19 19:22:56 -07:00
2020-01-07 16:07:01 -05:00
2020-07-10 14:50:51 +02:00
2020-06-25 16:26:25 -07:00
2020-08-04 20:16:37 -07:00
2019-11-15 14:38:29 +01:00
2020-03-29 22:30:57 -07:00
2020-03-29 22:30:57 -07:00
2020-05-11 16:04:35 +02:00
2020-07-02 14:19:15 -07:00
2019-12-04 19:44:12 -08:00
2020-02-12 17:57:51 -05:00
2019-11-08 14:18:32 -08:00
2020-07-14 16:29:42 -07:00
2019-11-04 07:11:31 -07:00
2020-08-03 17:57:40 -07:00
2019-11-15 14:38:29 +01:00
2020-07-06 14:06:08 +02:00
2020-03-24 15:59:34 -07:00
2019-11-15 14:38:29 +01:00
2020-07-17 12:54:30 -07:00
2020-02-27 18:50:19 -08:00
2020-06-02 19:45:12 -07:00
2020-02-21 11:22:15 -08:00
2020-01-15 11:00:39 -06:00
2020-01-31 10:30:39 -08:00
2020-07-28 22:25:30 -04:00
2019-12-18 18:07:31 +01:00
2020-07-31 17:00:44 -07:00
2020-04-20 16:18:14 +02:00
2020-07-07 15:55:21 +02:00
2019-12-18 18:07:33 +01:00
2020-02-21 11:22:15 -08:00
2019-12-18 18:07:33 +01:00
2019-10-04 14:25:17 -07:00
2020-09-18 13:58:37 -07:00
2020-09-18 13:58:37 -07:00
2020-08-12 10:57:59 -07:00
2019-12-09 09:59:07 +01:00
2020-03-29 23:29:08 +02:00
2020-04-07 10:43:39 -07:00
2019-11-15 14:38:29 +01:00
2020-05-18 15:34:21 +02:00
2020-05-12 17:05:31 +02:00
2020-07-10 13:45:32 +02:00
2020-07-10 13:45:32 +02:00
2020-06-03 11:27:43 +02:00
2020-06-18 13:07:13 -06:00
2020-08-05 18:39:18 -04:00
2020-08-05 18:39:18 -04:00
2020-07-19 08:13:24 +02:00
2020-08-05 09:30:19 -04:00
2020-08-05 09:30:20 -04:00
2020-08-05 11:08:39 -04:00
2020-08-03 16:11:42 -04:00
2020-08-05 11:08:39 -04:00
2020-08-05 11:08:39 -04:00
2020-08-05 11:08:39 -04:00
2020-08-05 11:08:40 -04:00
2020-06-04 15:36:52 -04:00
2020-08-05 11:08:40 -04:00
2020-08-05 11:08:40 -04:00
2020-08-05 11:08:40 -04:00
2020-08-05 11:08:41 -04:00
2020-08-05 11:08:40 -04:00
2020-06-02 02:45:13 -04:00
2020-08-05 11:08:40 -04:00
2019-12-11 15:01:23 -08:00
2020-05-19 15:19:06 +01:00
2019-12-16 19:22:22 -08:00
2020-07-31 09:24:23 +02:00
2020-06-12 13:23:34 -04:00
2020-07-13 15:32:56 -07:00
2020-06-24 07:51:01 +02:00
4976b718c3