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authorAlexei Starovoitov <ast@plumgrid.com>2014-09-26 00:17:04 -0700
committerDavid S. Miller <davem@davemloft.net>2014-09-26 15:05:15 -0400
commit0246e64d9a5fcd4805198de59b9b5cf1f974eb41 (patch)
tree3a7b78d9f3dcfb255d0ac9ce5350cef1e195eddf /include
parentcbd357008604925355ae7b54a09137dabb81b580 (diff)
bpf: handle pseudo BPF_LD_IMM64 insn
eBPF programs passed from userspace are using pseudo BPF_LD_IMM64 instructions to refer to process-local map_fd. Scan the program for such instructions and if FDs are valid, convert them to 'struct bpf_map' pointers which will be used by verifier to check access to maps in bpf_map_lookup/update() calls. If program passes verifier, convert pseudo BPF_LD_IMM64 into generic by dropping BPF_PSEUDO_MAP_FD flag. Note that eBPF interpreter is generic and knows nothing about pseudo insns. Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/filter.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 4ffc0958d85..ca95abd2bed 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -145,6 +145,12 @@ struct bpf_prog_aux;
.off = 0, \
.imm = ((__u64) (IMM)) >> 32 })
+#define BPF_PSEUDO_MAP_FD 1
+
+/* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
+#define BPF_LD_MAP_FD(DST, MAP_FD) \
+ BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
+
/* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */
#define BPF_MOV64_RAW(TYPE, DST, SRC, IMM) \