When we run fexit bpf programs (e.g. attaching tcp_recvmsg) on our servers
which were running old kernels, some of these servers crashed. Finally we
figured out that it was caused by the same issue resolved by
commit e21aa341785c ("bpf: Fix fexit trampoline."). After we backported
that commit, the crash disappears. However new issues are introduced by
that commit. This patchset fixes them.
PATCH #1: Fix a memory leak found on our server
PATCH #2: Remove bpf trampoline selector and also fix the issue in perf
caused by the name change in bpf trampoline
PATCH #3: Show target_{obj,btf}_id when link to a bpf trampoline
v1->v2:
- Reuse the common code between __bpf_tramp_image_put_deferred and
bpf_tramp_image_free (Song)
- Add fixes tag in patch #1 (Song)
- Restore the old bpf trampoline name format (Song)
- Jiri pointed out a issue in perf
- Show btf information in the tracing link info
Yafang Shao (3):
bpf: Fix memleak due to fentry attach failure
bpf: Remove bpf trampoline selector
bpf: Show target_{obj,btf}_id in tracing link info
include/linux/bpf.h | 1 -
kernel/bpf/syscall.c | 12 ++++++++++--
kernel/bpf/trampoline.c | 32 +++++++++++++++++++-------------
tools/bpf/bpftool/link.c | 4 ++++
4 files changed, 33 insertions(+), 16 deletions(-)
--
1.8.3.1
