Martin KaFai Lau 64696c40d0 bpf: Add __bpf_prog_{enter,exit}_struct_ops for struct_ops trampoline ... The struct_ops prog is to allow using bpf to implement the functions in a struct (eg. kernel module). The current usage is to implement the tcp_congestion. The kernel does not call the tcp-cc's ops (ie. the bpf prog) in a recursive way. The struct_ops is sharing the tracing-trampoline's enter/exit function which tracks prog->active to avoid recursion. It is needed for tracing prog. However, it turns out the struct_ops bpf prog will hit this prog->active and unnecessarily skipped running the struct_ops prog. eg. The '.ssthresh' may run in_task() and then interrupted by softirq that runs the same '.ssthresh'. Skip running the '.ssthresh' will end up returning random value to the caller. The patch adds __bpf_prog_{enter,exit}_struct_ops for the struct_ops trampoline. They do not track the prog->active to detect recursion. One exception is when the tcp_congestion's '.init' ops is doing bpf_setsockopt(TCP_CONGESTION) and then recurs to the same '.init' ops. This will be addressed in the following patches. Fixes: ca06f55b90 ("bpf: Add per-program recursion prevention mechanism") Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Link: https://lore.kernel.org/r/20220929070407.965581-2-martin.lau@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2022-09-29 09:25:47 -07:00
..
bpf	bpf: Add __bpf_prog_{enter,exit}_struct_ops for struct_ops trampoline	2022-09-29 09:25:47 -07:00
cgroup	Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next	2022-09-06 23:21:18 +02:00
configs	xen: branch for v6.0-rc1b	2022-08-14 09:28:54 -07:00
debug	Modules updates for v5.19-rc1	2022-05-26 17:13:43 -07:00
dma	remoteproc updates for v5.20	2022-08-08 15:16:29 -07:00
entry	context_tracking: Take NMI eqs entrypoints over RCU	2022-07-05 13:32:59 -07:00
events	Misc fixes to kprobes and the faddr2line script, plus a cleanup.	2022-08-06 17:28:12 -07:00
futex	drm for 5.19-rc1	2022-05-25 16:18:27 -07:00
gcov
irq	irqchip/genirq updates for 5.20:	2022-07-28 12:36:35 +02:00
kcsan	kcsan: test: Add a .kunitconfig to run KCSAN tests	2022-07-22 09:22:59 -06:00
livepatch	Livepatching changes for 5.19	2022-06-02 08:55:01 -07:00
locking	RCU pull request for v5.20 (or whatever)	2022-08-02 19:12:45 -07:00
module	module: kunit: Load .kunit_test_suites section when CONFIG_KUNIT=m	2022-08-15 13:51:07 -06:00
power	Char / Misc driver changes for 6.0-rc1	2022-08-04 11:05:48 -07:00
printk	printk: do not wait for consoles when suspended	2022-07-15 10:52:11 +02:00
rcu	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
sched	wait_on_bit: add an acquire memory barrier	2022-08-26 09:30:25 -07:00
time	time: Correct the prototype of ns_to_kernel_old_timeval and ns_to_timespec64	2022-08-09 20:02:13 +02:00
trace	bpf: Return value in kprobe get_func_ip only for entry address	2022-09-26 20:30:40 -07:00
.gitignore
acct.c
async.c
audit.c	audit: make is_audit_feature_set() static	2022-06-13 14:08:57 -04:00
audit.h
audit_fsnotify.c	audit: fix potential double free on error path from fsnotify_add_inode_mark	2022-08-22 18:50:06 -04:00
audit_tree.c
audit_watch.c
auditfilter.c
auditsc.c	audit: move audit_return_fixup before the filters	2022-08-25 17:25:08 -04:00
backtracetest.c
bounds.c
capability.c
cfi.c	context_tracking: Take IRQ eqs entrypoints over RCU	2022-07-05 13:32:59 -07:00
compat.c
configs.c
context_tracking.c	MAINTAINERS: Add Paul as context tracking maintainer	2022-07-05 13:33:00 -07:00
cpu.c
cpu_pm.c	context_tracking: Take IRQ eqs entrypoints over RCU	2022-07-05 13:32:59 -07:00
crash_core.c	vmcoreinfo: add kallsyms_num_syms symbol	2022-08-28 14:02:44 -07:00
crash_dump.c
cred.c
delayacct.c	delayacct: track delays from write-protect copy	2022-06-01 15:55:25 -07:00
dma.c
exec_domain.c
exit.c	exit: Fix typo in comment: s/sub-theads/sub-threads	2022-08-03 10:44:54 +02:00
extable.c	context_tracking: Take NMI eqs entrypoints over RCU	2022-07-05 13:32:59 -07:00
fail_function.c
fork.c	Tracing updates for 5.20 / 6.0	2022-08-05 09:41:12 -07:00
freezer.c
gen_kheaders.sh
groups.c	security: Add LSM hook to setgroups() syscall	2022-07-15 18:21:49 +00:00
hung_task.c	kernel/hung_task: fix address space of proc_dohung_task_timeout_secs	2022-07-29 18:12:35 -07:00
iomem.c
irq_work.c
jump_label.c	jump_label: make initial NOP patching the special case	2022-06-24 09:48:55 +02:00
kallsyms.c	Updates to various subsystems which I help look after. lib, ocfs2,	2022-08-07 10:03:24 -07:00
kallsyms_internal.h	kallsyms: move declarations to internal header	2022-07-17 17:31:39 -07:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c	kcov: update pos before writing pc in trace function	2022-05-25 13:05:42 -07:00
kexec.c
kexec_core.c	kexec: drop weak attribute from functions	2022-07-15 12:21:16 -04:00
kexec_elf.c
kexec_file.c	Updates to various subsystems which I help look after. lib, ocfs2,	2022-08-07 10:03:24 -07:00
kexec_internal.h
kheaders.c
kmod.c
kprobes.c	kprobes: Add new KPROBE_FLAG_ON_FUNC_ENTRY kprobe flag	2022-09-26 20:30:39 -07:00
ksysfs.c
kthread.c	kthread: make it clear that kthread_create_on_node() might be terminated by any fatal signal	2022-06-16 19:11:30 -07:00
latencytop.c
Makefile	kernel: remove platform_has() infrastructure	2022-08-01 07:42:56 +02:00
module_signature.c
notifier.c
nsproxy.c	fs/exec: allow to unshare a time namespace on vfork+exec	2022-06-15 07:58:04 -07:00
padata.c
panic.c	linux-kselftest-kunit-5.20-rc1	2022-08-02 19:34:45 -07:00
params.c
pid.c
pid_namespace.c
profile.c	profile: setup_profiling_timer() is moslty not implemented	2022-07-29 18:12:36 -07:00
ptrace.c	ptrace: fix clearing of JOBCTL_TRACED in ptrace_unfreeze_traced()	2022-07-09 11:06:19 -07:00
range.c
reboot.c	Merge branch 'rework/kthreads' into for-linus	2022-06-23 19:11:28 +02:00
regset.c
relay.c
resource.c	resource: Introduce alloc_free_mem_region()	2022-07-21 17:19:25 -07:00
resource_kunit.c
rseq.c	rseq: Kill process when unknown flags are encountered in ABI structures	2022-08-01 15:21:42 +02:00
scftorture.c
scs.c
seccomp.c
signal.c	signal handling: don't use BUG_ON() for debugging	2022-07-07 09:53:43 -07:00
smp.c	locking/csd_lock: Change csdlock_debug from early_param to __setup	2022-07-19 11:40:00 -07:00
smpboot.c
smpboot.h
softirq.c	context_tracking: Take IRQ eqs entrypoints over RCU	2022-07-05 13:32:59 -07:00
stackleak.c
stacktrace.c
static_call.c
static_call_inline.c
stop_machine.c	Scheduler changes in this cycle were:	2022-05-24 11:11:13 -07:00
sys.c
sys_ni.c	kernel/sys_ni: add compat entry for fadvise64_64	2022-08-20 15:17:45 -07:00
sysctl-test.c
sysctl.c	kernel/sysctl.c: Remove trailing white space	2022-08-08 09:01:36 -07:00
task_work.c
taskstats.c	genetlink: start to validate reserved header bytes	2022-08-29 12:47:15 +01:00
torture.c
tracepoint.c
tsacct.c
ucount.c
uid16.c
uid16.h
umh.c
up.c
user-return-notifier.c
user.c
user_namespace.c
usermode_driver.c
utsname.c
utsname_sysctl.c
watch_queue.c	This was a moderately busy cycle for documentation, but nothing all that	2022-08-02 19:24:24 -07:00
watchdog.c	powerpc updates for 6.0	2022-08-06 16:38:17 -07:00
watchdog_hld.c	Revert "printk: add functions to prefer direct printing"	2022-06-23 18:41:40 +02:00
workqueue.c	drm for 5.20/6.0	2022-08-03 19:52:08 -07:00
workqueue_internal.h