Commit 28c2fae7 authored Nov 02, 2018 by Daniel Borkmann Committed by Alexei Starovoitov Nov 02, 2018

bpf: fix bpf_prog_get_info_by_fd to return 0 func_lens for unpriv



While dbecd738 ("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 815581c1 ("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: 815581c1 ("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>

parent b0970f23

kernel/bpf/syscall.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -2078,6 +2078,7 @@ 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;
		}

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