Jiri reported crash when JIT is on, but net.core.bpf_jit_kallsyms is off.
bpf_prog_kallsyms_find() was skipping addr->bpf_prog resolution
logic in oops and stack traces. That's incorrect.
It should only skip addr->name resolution for 'cat /proc/kallsyms'.
That's what bpf_jit_kallsyms and bpf_jit_harden protect.
Reported-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
Fixes: 3dec541b2e63 ("bpf: Add support for BTF pointers to x86 JIT")
---
kernel/bpf/core.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 673f5d40a93e..8d3fbc86ca5e 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -668,9 +668,6 @@ static struct bpf_prog *bpf_prog_kallsyms_find(unsigned long addr)
{
struct latch_tree_node *n;
- if (!bpf_jit_kallsyms_enabled())
- return NULL;
-
n = latch_tree_find((void *)addr, &bpf_tree, &bpf_tree_ops);
return n ?
container_of(n, struct bpf_prog_aux, ksym_tnode)->prog :
--
2.17.1
