4.19-stable review patch. If anyone has any objections, please let me know.
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[ 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; }