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authorDaniel Borkmann <daniel@iogearbox.net>2017-07-27 21:02:46 +0200
committerDavid S. Miller <davem@davemloft.net>2017-07-29 14:28:54 -0700
commit89b096898a8450b0a5b97d521e000ae9f94f81f9 (patch)
treefab22c5fc592d584692e3b4f29634825d50a1f18 /kernel/bpf
parentc9f2c1ae123a751d4e4f949144500219354d5ee1 (diff)
downloadop-kernel-dev-89b096898a8450b0a5b97d521e000ae9f94f81f9.zip
op-kernel-dev-89b096898a8450b0a5b97d521e000ae9f94f81f9.tar.gz
bpf: don't indicate success when copy_from_user fails
err in bpf_prog_get_info_by_fd() still holds 0 at that time from prior check_uarg_tail_zero() check. Explicitly return -EFAULT instead, so user space can be notified of buggy behavior. Fixes: 1e2709769086 ("bpf: Add BPF_OBJ_GET_INFO_BY_FD") Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/bpf')
-rw-r--r--kernel/bpf/syscall.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 045646d..84bb399 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -1289,7 +1289,7 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
info_len = min_t(u32, sizeof(info), info_len);
if (copy_from_user(&info, uinfo, info_len))
- return err;
+ return -EFAULT;
info.type = prog->type;
info.id = prog->aux->id;
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