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bpftool: Skip prog/map that disappears while looking it up by name

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Looking up a prog or map by name walks the whole id space. There is a
window between bpf_prog_get_next_id()/bpf_map_get_next_id() and getting
an fd for that id in which an unrelated object can be freed, and the
lookup then fails with ENOENT and aborts the whole command.

Skip such ids and keep walking, the same way do_show() already does.

Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Link: https://lore.kernel.org/bpf/20260720071520.396363-1-jiayuan.chen@linux.dev
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
This commit is contained in:
Jiayuan Chen 2026-07-20 15:15:18 +08:00 committed by Kumar Kartikeya Dwivedi
parent 761214e5c0
commit cfce77b633
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1 changed files with 4 additions and 0 deletions
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4
tools/bpf/bpftool/common.c
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@ -832,6 +832,8 @@ static int prog_fd_by_nametag(void *nametag, int **fds, bool tag)
fd = bpf_prog_get_fd_by_id(id);
if (fd < 0) {
if (errno == ENOENT)
continue;
p_err("can't get prog by id (%u): %s",
id, strerror(errno));
goto err_close_fds;
@ -996,6 +998,8 @@ static int map_fd_by_name(char *name, int **fds,
opts_ro.open_flags = BPF_F_RDONLY;
fd = bpf_map_get_fd_by_id_opts(id, &opts_ro);
if (fd < 0) {
if (errno == ENOENT)
continue;
p_err("can't get map by id (%u): %s",
id, strerror(errno));
goto err_close_fds;