Chuang Wang 8094029330 libbpf: Cleanup the legacy kprobe_event on failed add/attach_event() ... Before the 0bc11ed5ab commit ("kprobes: Allow kprobes coexist with livepatch"), in a scenario where livepatch and kprobe coexist on the same function entry, the creation of kprobe_event using add_kprobe_event_legacy() will be successful, at the same time as a trace event (e.g. /debugfs/tracing/events/kprobe/XXX) will exist, but perf_event_open() will return an error because both livepatch and kprobe use FTRACE_OPS_FL_IPMODIFY. As follows: 1) add a livepatch $ insmod livepatch-XXX.ko 2) add a kprobe using tracefs API (i.e. add_kprobe_event_legacy) $ echo 'p:mykprobe XXX' > /sys/kernel/debug/tracing/kprobe_events 3) enable this kprobe (i.e. sys_perf_event_open) This will return an error, -EBUSY. On Andrii Nakryiko's comment, few error paths in bpf_program__attach_kprobe_opts() that should need to call remove_kprobe_event_legacy(). With this patch, whenever an error is returned after add_kprobe_event_legacy() or bpf_program__attach_perf_event_opts(), this ensures that the created kprobe_event is cleaned. Signed-off-by: Chuang Wang <nashuiliang@gmail.com> Signed-off-by: Jingren Zhou <zhoujingren@didiglobal.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20220629151848.65587-2-nashuiliang@gmail.com		2022-07-05 21:21:41 -07:00
..
api	Kbuild updates for v5.18	2022-03-31 11:59:03 -07:00
bpf	libbpf: Cleanup the legacy kprobe_event on failed add/attach_event()	2022-07-05 21:21:41 -07:00
perf	perf tools: Allow system-wide events to keep their own threads	2022-05-26 12:36:57 -03:00
subcmd	libsubcmd: Fix OPTION_GROUP sorting	2022-04-22 12:32:01 +02:00
symbol
thermal	tools/lib/thermal: remove unneeded semicolon	2022-05-19 12:11:52 +02:00
traceevent	libtraceevent: Add __rel_loc relative location attribute support	2021-12-06 15:37:22 -05:00
argv_split.c
bitmap.c	bitmap: Fix return values to be unsigned	2022-06-03 06:52:58 -07:00
ctype.c
find_bit.c	tools: sync tools/bitmap with mother linux	2022-01-15 08:47:31 -08:00
hweight.c
list_sort.c	tools lib: Adopt list_sort() from the kernel sources	2021-10-20 10:30:59 -03:00
rbtree.c
slab.c	tools: Move gfp.h and slab.h from radix-tree to lib	2022-02-20 08:44:37 +02:00
str_error_r.c
string.c
vsprintf.c
zalloc.c