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tests: fix prog_info initialization in bpf-obj_get_info_by_fd-prog*

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The sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &bpf_prog_get_info_attr, ...) is
called in a loop.  The bpf_prog_get_info_attr.info object is in size 104
but bpf_prog_get_info_attr.info_len is in size 168.  Hence, if the prog
is jited, the second iteration onwards will have nr_jited_ksyms == 1
which is asking the kernel to fill the
bpf_prog_get_info_attr.info.jited_ksyms and it is NULL.

* tests/bpf-obj_get_info_by_fd.c (main): Clear memory beyond prog_info
at the start of every iteration.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
This commit is contained in:
Martin Lau 2019-01-03 23:36:22 +00:00 committed by Dmitry V. Levin
parent 3e93457d5f
commit 91cdd32f65
1 changed files with 1 additions and 0 deletions
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tests/bpf-obj_get_info_by_fd.c
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@ -345,6 +345,7 @@ main(void)
memset(prog_info, 0, PROG_INFO_SZ);
for (unsigned int i = 0; i < 4; i++) {
prog_info->jited_prog_len = 0;
memset(prog_info + 1, 0, PROG_INFO_SZ - sizeof(*prog_info));
switch (i) {
case 1:
prog_info->xlated_prog_insns =