From: Hou Tao <houtao1@xxxxxxxxxx>
Hi,
The patch set aims to fix the warnings in kvmalloc_node() when passing
an abnormally big cnt during multiple kprobes/uprobes attachment.
Patch #1 and #2 fix the warning by limiting the maximal number of
uprobes/kprobes. Patch #3, #4, and #5 add tests to ensure these
warnings are fixed.
Please see individual patches for more details. Comments are always
welcome.
Change Log:
v3:
* add ack tags from Jiri
* return -E2BIG instead of -EINVAL for too-big cnt (Andrii)
* patch #3: rename the subtest from "failed_link_api" to
"attach_api_fails", so it is consistent with the naming
convention in multi-kprobe test.
* patch #4: newly-added patch to remove libbpf_get_error() in
kprobe_multi_test (Andrii)
v2: https://lore.kernel.org/bpf/20231213112531.3775079-1-houtao@xxxxxxxxxxxxxxx/
* limit the number of uprobes/kprobes instead of suppressing the
out-of-memory warning message (Alexei)
* provide a faked non-zero offsets to simplify the multiple uprobe
test (Jiri)
v1: https://lore.kernel.org/bpf/20231211112843.4147157-1-houtao@xxxxxxxxxxxxxxx/
Hou Tao (5):
bpf: Limit the number of uprobes when attaching program to multiple
uprobes
bpf: Limit the number of kprobes when attaching program to multiple
kprobes
selftests/bpf: Add test for abnormal cnt during multi-uprobe
attachment
selftests/bpf: Don't use libbpf_get_error() in kprobe_multi_test
selftests/bpf: Add test for abnormal cnt during multi-kprobe
attachment
kernel/trace/bpf_trace.c | 7 ++++
.../bpf/prog_tests/kprobe_multi_test.c | 31 +++++++++++++++---
.../bpf/prog_tests/uprobe_multi_test.c | 32 ++++++++++++++++++-
3 files changed, 64 insertions(+), 6 deletions(-)
--
2.29.2
