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| author | Daniel Borkmann <daniel@iogearbox.net> | 2020-05-15 12:11:17 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-05-15 17:10:36 +0200 |
| commit | 47cc0ed574abcbbde0cf143ddb21a0baed1aa2df (patch) | |
| tree | b8872b7cca31323beb60b824bbd073bd5b34197c | |
| parent | bpf: Restrict bpf_probe_read{, str}() only to archs where they work (diff) | |
| download | linux-47cc0ed574abcbbde0cf143ddb21a0baed1aa2df.tar.xz linux-47cc0ed574abcbbde0cf143ddb21a0baed1aa2df.zip | |
bpf: Add bpf_probe_read_{user, kernel}_str() to do_refine_retval_range
Given bpf_probe_read{,str}() BPF helpers are now only available under
CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE, we need to add the drop-in
replacements of bpf_probe_read_{kernel,user}_str() to do_refine_retval_range()
as well to avoid hitting the same issue as in 849fa50662fbc ("bpf/verifier:
refine retval R0 state for bpf_get_stack helper").
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20200515101118.6508-3-daniel@iogearbox.net
| -rw-r--r-- | kernel/bpf/verifier.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index a44ba6672688..8d7ee40e2748 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -4340,7 +4340,9 @@ static void do_refine_retval_range(struct bpf_reg_state *regs, int ret_type, if (ret_type != RET_INTEGER || (func_id != BPF_FUNC_get_stack && - func_id != BPF_FUNC_probe_read_str)) + func_id != BPF_FUNC_probe_read_str && + func_id != BPF_FUNC_probe_read_kernel_str && + func_id != BPF_FUNC_probe_read_user_str)) return; ret_reg->smax_value = meta->msize_max_value; |