| From 66ddd04876824ffdcaab9b7f0679cda476e31d15 Mon Sep 17 00:00:00 2001 |
| From: Daniel Borkmann <daniel@iogearbox.net> |
| Date: Fri, 2 Nov 2018 11:35:46 +0100 |
| Subject: bpf: fix bpf_prog_get_info_by_fd to return 0 func_lens for unpriv |
| |
| [ Upstream commit 28c2fae726bf5003cd209b0d5910a642af98316f ] |
| |
| While dbecd7388476 ("bpf: get kernel symbol addresses via syscall") |
| zeroed info.nr_jited_ksyms in bpf_prog_get_info_by_fd() for queries |
| from unprivileged users, commit 815581c11cc2 ("bpf: get JITed image |
| lengths of functions via syscall") forgot about doing so and therefore |
| returns the #elems of the user set up buffer which is incorrect. It |
| also needs to indicate a info.nr_jited_func_lens of zero. |
| |
| Fixes: 815581c11cc2 ("bpf: get JITed image lengths of functions via syscall") |
| Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> |
| Cc: Sandipan Das <sandipan@linux.vnet.ibm.com> |
| Cc: Song Liu <songliubraving@fb.com> |
| Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
| Signed-off-by: Sasha Levin <sashal@kernel.org> |
| --- |
| kernel/bpf/syscall.c | 1 + |
| 1 file changed, 1 insertion(+) |
| |
| diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c |
| index 675eb6d36e47..382c09dddf93 100644 |
| --- a/kernel/bpf/syscall.c |
| +++ b/kernel/bpf/syscall.c |
| @@ -1974,6 +1974,7 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog, |
| info.jited_prog_len = 0; |
| info.xlated_prog_len = 0; |
| info.nr_jited_ksyms = 0; |
| + info.nr_jited_func_lens = 0; |
| goto done; |
| } |
| |
| -- |
| 2.17.1 |
| |
