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authorJakub Kicinski <jakub.kicinski@netronome.com>2017-12-22 11:36:06 -0800
committerDaniel Borkmann <daniel@iogearbox.net>2017-12-23 01:09:52 +0100
commit8207c6dd4746c345b689684c4cd0ce00a18c7ef2 (patch)
tree36104aee2ea7b2b4a7326c369478890aad7243ef /tools
parentb3b1b6532890c70987821946f90c22b8021aaaf8 (diff)
downloadlinux-8207c6dd4746c345b689684c4cd0ce00a18c7ef2.tar.bz2
tools: bpftool: protect against races with disappearing objects
On program/map show we may get an ID of an object from GETNEXT, but the object may disappear before we call GET_FD_BY_ID. If that happens, ignore the object and continue. Fixes: 71bb428fe2c1 ("tools: bpf: add bpftool") Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Acked-by: Quentin Monnet <quentin.monnet@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools')
-rw-r--r--tools/bpf/bpftool/map.c2
-rw-r--r--tools/bpf/bpftool/prog.c2
2 files changed, 4 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c
index 8368b7ea31b5..a8c3a33dd185 100644
--- a/tools/bpf/bpftool/map.c
+++ b/tools/bpf/bpftool/map.c
@@ -528,6 +528,8 @@ static int do_show(int argc, char **argv)
fd = bpf_map_get_fd_by_id(id);
if (fd < 0) {
+ if (errno == ENOENT)
+ continue;
p_err("can't get map by id (%u): %s",
id, strerror(errno));
break;
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index ad619b96c276..dded77345bfb 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -382,6 +382,8 @@ static int do_show(int argc, char **argv)
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));
err = -1;