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Jiri Olsa f70986902c bpf: Fix kprobe_multi return probe backtrace 
Andrii reported that backtraces from kprobe_multi program attached
as return probes are not complete and showing just initial entry [1].

It's caused by changing registers to have original function ip address
as instruction pointer even for return probe, which will screw backtrace
from return probe.

This change keeps registers intact and store original entry ip and
link address on the stack in bpf_kprobe_multi_run_ctx struct, where
bpf_get_func_ip and bpf_get_attach_cookie helpers for kprobe_multi
programs can find it.

[1] https://lore.kernel.org/bpf/CAEf4BzZDDqK24rSKwXNp7XL3ErGD4bZa1M6c_c4EvDSt3jrZcg@mail.gmail.com/T/#m8d1301c0ea0892ddf9dc6fba57a57b8cf11b8c51

Fixes: ca74823c6e ("bpf: Add cookie support to programs attached with kprobe multi link")
Reported-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220321070113.1449167-3-jolsa@kernel.org
2022-03-21 14:54:15 +01:00
..
bpf Revert "bpf: Add support to inline bpf_get_func_ip helper on x86" 2022-03-21 14:53:42 +01:00
cgroup Merge branch 'for-5.17-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 2022-02-22 16:14:35 -08:00
configs configs: introduce debug.config for CI-like setup 2022-01-20 08:52:55 +02:00
debug kdb: Adopt scheduler's task classification 2021-11-03 17:21:37 +00:00
dma swiotlb: fix info leak with DMA_FROM_DEVICE 2022-02-14 10:22:28 +01:00
entry entry: Snapshot thread flags 2021-12-01 00:06:43 +01:00
events perf: Fix list corruption in perf_cgroup_switch() 2022-02-06 22:37:27 +01:00
futex Merge branch 'signal-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2022-01-17 05:49:30 +02:00
gcov gcov: Remove compiler version check 2021-12-02 17:25:21 +09:00
irq proc: remove PDE_DATA() completely 2022-01-22 08:33:37 +02:00
kcsan KCSAN updates for v5.17 2022-01-11 09:51:26 -08:00
livepatch Livepatching changes for 5.17 2022-01-16 10:08:13 +02:00
locking lockdep: Correct lock_classes index mapping 2022-02-11 23:30:02 +01:00
power PM: s2idle: ACPI: Fix wakeup interrupts handling 2022-02-07 21:02:31 +01:00
printk printk: Fix incorrect __user type in proc_dointvec_minmax_sysadmin() 2022-02-03 11:27:38 -08:00
rcu rcu-tasks: Fix computation of CPU-to-list shift counts 2022-01-26 13:04:05 -08:00
sched sched: Fix yet more sched_fork() races 2022-02-19 11:11:05 +01:00
time bitmap patches for 5.17-rc1 2022-01-23 06:20:44 +02:00
trace bpf: Fix kprobe_multi return probe backtrace 2022-03-21 14:54:15 +01:00
.gitignore
acct.c kernel: remove spurious blkdev.h includes 2021-10-18 06:17:01 -06:00
async.c Revert "module, async: async_synchronize_full() on module init iff async is used" 2022-02-03 11:20:34 -08:00
audit.c audit: improve audit queue handling when "audit=1" on cmdline 2022-01-25 13:22:51 -05:00
audit.h audit/stable-5.16 PR 20211101 2021-11-01 21:17:39 -07:00
audit_fsnotify.c fsnotify: clarify contract for create event hooks 2021-10-27 12:32:34 +02:00
audit_tree.c audit: use struct_size() helper in kmalloc() 2021-12-14 17:39:42 -05:00
audit_watch.c \n 2021-11-06 16:43:20 -07:00
auditfilter.c audit/stable-5.17 PR 20220110 2022-01-11 13:08:21 -08:00
auditsc.c audit: don't deref the syscall args when checking the openat2 open_how::flags 2022-02-09 16:04:26 -05:00
backtracetest.c
bounds.c
capability.c
cfi.c cfi: Use rcu_read_{un}lock_sched_notrace 2021-08-11 13:11:12 -07:00
compat.c arch: remove compat_alloc_user_space 2021-09-08 15:32:35 -07:00
configs.c
context_tracking.c
cpu.c sched/scs: Reset task stack state in bringup_cpu() 2021-11-24 12:20:27 +01:00
cpu_pm.c PM: cpu: Make notifier chain use a raw_spinlock_t 2021-08-16 18:55:32 +02:00
crash_core.c kernel/crash_core: suppress unknown crashkernel parameter warning 2021-12-25 12:20:55 -08:00
crash_dump.c
cred.c ucounts: Base set_cred_ucounts changes on the real user 2022-02-17 09:11:02 -06:00
delayacct.c delayacct: track delays from memory compact 2022-01-20 08:52:55 +02:00
dma.c
exec_domain.c
exit.c rethook: Add a generic return hook 2022-03-17 20:16:29 -07:00
extable.c extable: use is_kernel_text() helper 2021-11-09 10:02:51 -08:00
fail_function.c
fork.c rethook: Add a generic return hook 2022-03-17 20:16:29 -07:00
freezer.c
gen_kheaders.sh
groups.c
hung_task.c hung_task: move hung_task sysctl interface to hung_task.c 2022-01-22 08:33:34 +02:00
iomem.c
irq_work.c irq_work: Also rcuwait for !IRQ_WORK_HARD_IRQ on PREEMPT_RT 2021-10-15 11:25:18 +02:00
jump_label.c jump_label: Fix jump_label_text_reserved() vs __init 2021-07-05 10:46:20 +02:00
kallsyms.c kallsyms: Skip the name search for empty string 2022-03-17 20:17:18 -07:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks locking/rwlock: Provide RT variant 2021-08-17 17:50:51 +02:00
Kconfig.preempt preempt: Restore preemption model selection configs 2021-11-11 13:09:33 +01:00
kcov.c kcov: replace local_irq_save() with a local_lock_t 2021-11-09 10:02:52 -08:00
kexec.c kexec: avoid compat_alloc_user_space 2021-09-08 15:32:34 -07:00
kexec_core.c exit: Move oops specific logic from do_exit into make_task_dead 2021-12-13 12:04:45 -06:00
kexec_elf.c
kexec_file.c memblock: add MEMBLOCK_DRIVER_MANAGED to mimic IORESOURCE_SYSRAM_DRIVER_MANAGED 2021-11-06 13:30:42 -07:00
kexec_internal.h
kheaders.c
kmod.c
kprobes.c kprobe: move sysctl_kprobes_optimization to kprobes.c 2022-01-22 08:33:36 +02:00
ksysfs.c
kthread.c Merge branch 'akpm' (patches from Andrew) 2022-01-20 10:41:01 +02:00
latencytop.c
Makefile module: add in-kernel support for decompressing 2022-01-11 18:45:02 -08:00
module-internal.h module: add in-kernel support for decompressing 2022-01-11 18:45:02 -08:00
module.c Revert "module, async: async_synchronize_full() on module init iff async is used" 2022-02-03 11:20:34 -08:00
module_decompress.c module: fix building with sysfs disabled 2022-02-16 12:51:32 -08:00
module_signature.c
module_signing.c
notifier.c notifier: Return an error when a callback has already been registered 2021-12-29 10:37:33 +01:00
nsproxy.c memcg: enable accounting for new namesapces and struct nsproxy 2021-09-03 09:58:12 -07:00
padata.c padata: Remove repeated verbose license text 2021-08-27 16:30:18 +08:00
panic.c panic: remove oops_id 2022-01-20 08:52:55 +02:00
params.c kobject: remove kset from struct kset_uevent_ops callbacks 2021-12-28 11:26:18 +01:00
pid.c pid: add pidfd_get_task() helper 2021-10-14 13:29:18 +02:00
pid_namespace.c memcg: enable accounting for new namesapces and struct nsproxy 2021-09-03 09:58:12 -07:00
profile.c exit: Remove profile_handoff_task 2022-01-08 12:43:57 -06:00
ptrace.c ptrace: Remove second setting of PT_SEIZED in ptrace_attach 2022-01-08 12:43:57 -06:00
range.c
reboot.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2021-11-12 11:53:16 -08:00
regset.c
relay.c
resource.c proc: remove PDE_DATA() completely 2022-01-22 08:33:37 +02:00
resource_kunit.c
rseq.c KVM: rseq: Update rseq when processing NOTIFY_RESUME on xfer to KVM guest 2021-09-22 10:24:01 -04:00
scftorture.c scftorture: Always log error message 2021-12-07 16:36:17 -08:00
scs.c scs: Release kasan vmalloc poison in scs_free process 2021-09-30 09:37:27 +01:00
seccomp.c seccomp: Invalidate seccomp mode to catch death failures 2022-02-10 19:09:12 -08:00
signal.c signal: HANDLER_EXIT should clear SIGNAL_UNKILLABLE 2022-02-10 19:08:54 -08:00
smp.c sched: Improve wake_up_all_idle_cpus() take #2 2021-10-22 15:32:46 +02:00
smpboot.c smpboot: Replace deprecated CPU-hotplug functions. 2021-08-10 14:57:42 +02:00
smpboot.h
softirq.c timers/nohz: Last resort update jiffies on nohz_full IRQ entry 2021-12-02 15:07:22 +01:00
stackleak.c gcc-plugins/stackleak: Use noinstr in favor of notrace 2022-02-03 17:02:21 -08:00
stacktrace.c stacktrace: move filter_irq_stacks() to kernel/stacktrace.c 2021-11-06 13:30:43 -07:00
static_call.c static_call: Fix static_call_text_reserved() vs __init 2021-07-05 10:46:33 +02:00
stop_machine.c
sys.c ucounts: Move RLIMIT_NPROC handling after set_user 2022-02-17 09:11:26 -06:00
sys_ni.c mm/mempolicy: wire up syscall set_mempolicy_home_node 2022-01-15 16:30:30 +02:00
sysctl-test.c kernel/sysctl-test: Remove some casts which are no-longer required 2021-06-23 16:41:24 -06:00
sysctl.c sysctl: returns -EINVAL when a negative value is passed to proc_doulongvec_minmax 2022-01-22 08:33:37 +02:00
task_work.c
taskstats.c
torture.c locktorture,rcutorture,torture: Always log error message 2021-12-07 16:36:17 -08:00
tracepoint.c tracepoint: Fix kerneldoc comments 2021-08-16 11:39:51 -04:00
tsacct.c taskstats: Cleanup the use of task->exit_code 2022-01-08 12:43:57 -06:00
ucount.c ucounts: Handle wrapping in is_ucounts_overlimit 2022-02-17 09:11:57 -06:00
uid16.c
uid16.h
umh.c
up.c
user-return-notifier.c
user.c fs/epoll: use a per-cpu counter for user's watches count 2021-09-08 11:50:27 -07:00
user_namespace.c ucounts: Fix systemd LimitNPROC with private users regression 2022-02-25 10:40:14 -06:00
usermode_driver.c Merge branch 'work.namei' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2021-07-03 11:41:14 -07:00
utsname.c
utsname_sysctl.c
watch_queue.c
watchdog.c watchdog: move watchdog sysctl interface to watchdog.c 2022-01-22 08:33:34 +02:00
watchdog_hld.c
workqueue.c Merge branch 'workqueue/for-5.16-fixes' into workqueue/for-5.17 2022-01-10 07:54:04 -10:00
workqueue_internal.h workqueue: Assign a color to barrier work items 2021-08-17 07:49:10 -10:00