Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Steven Rostedt (VMware) 20c2f141b1 tracing / histogram: Fix NULL pointer dereference on strcmp() on NULL event name ... [ Upstream commit 5acce0bff2a0420ce87d4591daeb867f47d552c2 ] The following commands: # echo 'read_max u64 size;' > synthetic_events # echo 'hist:keys=common_pid:count=count:onmax($count).trace(read_max,count)' > events/syscalls/sys_enter_read/trigger Causes: BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP CPU: 4 PID: 1763 Comm: bash Not tainted 5.14.0-rc2-test+ #155 Hardware name: Hewlett-Packard HP Compaq Pro 6300 SFF/339A, BIOS K01 v03.03 07/14/2016 RIP: 0010:strcmp+0xc/0x20 Code: 75 f7 31 c0 0f b6 0c 06 88 0c 02 48 83 c0 01 84 c9 75 f1 4c 89 c0 c3 0f 1f 80 00 00 00 00 31 c0 eb 08 48 83 c0 01 84 d2 74 0f <0f> b6 14 07 3a 14 06 74 ef 19 c0 83 c8 01 c3 31 c0 c3 66 90 48 89 RSP: 0018:ffffb5fdc0963ca8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffffffb3a4e040 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff9714c0d0b640 RDI: 0000000000000000 RBP: 0000000000000000 R08: 00000022986b7cde R09: ffffffffb3a4dff8 R10: 0000000000000000 R11: 0000000000000000 R12: ffff9714c50603c8 R13: 0000000000000000 R14: ffff97143fdf9e48 R15: ffff9714c01a2210 FS: 00007f1fa6785740(0000) GS:ffff9714da400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000002d863004 CR4: 00000000001706e0 Call Trace: __find_event_file+0x4e/0x80 action_create+0x6b7/0xeb0 ? kstrdup+0x44/0x60 event_hist_trigger_func+0x1a07/0x2130 trigger_process_regex+0xbd/0x110 event_trigger_write+0x71/0xd0 vfs_write+0xe9/0x310 ksys_write+0x68/0xe0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f1fa6879e87 The problem was the "trace(read_max,count)" where the "count" should be "$count" as "onmax()" only handles variables (although it really should be able to figure out that "count" is a field of sys_enter_read). But there's a path that does not find the variable and ends up passing a NULL for the event, which ends up getting passed to "strcmp()". Add a check for NULL to return and error on the command with: # cat error_log hist:syscalls:sys_enter_read: error: Couldn't create or find variable Command: hist:keys=common_pid:count=count:onmax($count).trace(read_max,count) ^ Link: https://lkml.kernel.org/r/20210808003011.4037f8d0@oasis.local.home Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: stable@vger.kernel.org Fixes: 50450603ec tracing: Add 'onmax' hist trigger action support Reviewed-by: Tom Zanussi <zanussi@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-08-26 08:36:20 -04:00
..
bpf	bpf: Clear zext_dst of dead insns	2021-08-26 08:36:17 -04:00
cgroup	cgroup1: fix leaked context root causing sporadic NULL deref in LTP	2021-07-31 08:19:37 +02:00
configs
debug	kdb: Make memory allocations more robust	2021-03-04 10:26:10 +01:00
dma	swiotlb: fix "x86: Don't panic if can not alloc buffer for swiotlb"	2020-11-18 19:20:32 +01:00
events	perf: Fix data race between pin_count increment/decrement	2021-06-16 11:59:44 +02:00
gcov	gcov: re-fix clang-11+ support	2021-04-14 08:24:10 +02:00
irq	genirq/timings: Prevent potential array overflow in __irq_timings_store()	2021-08-18 08:57:02 +02:00
livepatch
locking	lockding/lockdep: Avoid to find wrong lock dep path in check_irq_usage()	2021-07-14 16:53:15 +02:00
power	PM: EM: postpone creating the debugfs dir till fs_initcall	2021-03-30 14:35:28 +02:00
printk	printk: fix deadlock when kernel panic	2021-03-04 10:26:50 +01:00
rcu	srcu: Fix broken node geometry after early ssp init	2021-07-20 16:10:41 +02:00
sched	sched/fair: Fix CFS bandwidth hrtimer expiry type	2021-07-25 14:35:13 +02:00
time	timers: Move clearing of base::timer_running under base:: Lock	2021-08-12 13:21:03 +02:00
trace	tracing / histogram: Fix NULL pointer dereference on strcmp() on NULL event name	2021-08-26 08:36:20 -04:00
.gitignore	kbuild: update config_data.gz only when the content of .config is changed	2021-05-11 14:04:16 +02:00
acct.c
async.c
audit.c	audit: fix a net reference leak in audit_list_rules_send()	2020-06-22 09:30:59 +02:00
audit.h	audit: fix a net reference leak in audit_list_rules_send()	2020-06-22 09:30:59 +02:00
audit_fsnotify.c
audit_tree.c
audit_watch.c	audit: CONFIG_CHANGE don't log internal bookkeeping as an event	2020-10-01 13:17:32 +02:00
auditfilter.c	audit: fix a net reference leak in audit_list_rules_send()	2020-06-22 09:30:59 +02:00
auditsc.c
backtracetest.c
bounds.c
capability.c
compat.c
configs.c
context_tracking.c
cpu.c	cpu/hotplug: Cure the cpusets trainwreck	2021-07-19 08:53:15 +02:00
cpu_pm.c	kernel/cpu_pm: Fix uninitted local in cpu_pm	2020-06-22 09:31:22 +02:00
crash_core.c
crash_dump.c
cred.c	keys: Fix request_key() cache	2020-01-17 19:48:42 +01:00
delayacct.c
dma.c
exec_domain.c
exit.c	don't dump the threads that had been already exiting when zapped.	2020-11-18 19:20:31 +01:00
extable.c
fail_function.c	fail_function: Remove a redundant mutex unlock	2020-11-24 13:29:18 +01:00
fork.c	exec: Transform exec_update_mutex into a rw_semaphore	2021-01-09 13:44:55 +01:00
freezer.c
futex.c	mm, futex: fix shared futex pgoff on shmem huge page	2021-06-30 08:47:55 -04:00
gen_kheaders.sh	kbuild: add variables for compression tools	2020-09-03 11:27:10 +02:00
groups.c
hung_task.c
iomem.c
irq_work.c
jump_label.c
kallsyms.c	kallsyms: Refactor kallsyms_show_value() to take cred	2020-07-16 08:16:44 +02:00
kcmp.c	exec: Transform exec_update_mutex into a rw_semaphore	2021-01-09 13:44:55 +01:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c
kexec.c
kexec_core.c	kernel: kexec: remove the lock operation of system_transition_mutex	2021-02-03 23:25:56 +01:00
kexec_elf.c
kexec_file.c	kernel: kexec_file: fix error return code of kexec_calculate_store_digests()	2021-05-19 10:08:28 +02:00
kexec_internal.h
kheaders.c
kmod.c	kmod: make request_module() return an error when autoloading is disabled	2020-04-17 10:50:22 +02:00
kprobes.c	tracing/kprobe: Fix to support kretprobe events on unloaded modules	2021-02-13 13:52:54 +01:00
ksysfs.c
kthread.c	kthread_worker: fix return value when kthread_mod_delayed_work() races with kthread_cancel_delayed_work_sync()	2021-07-14 16:53:19 +02:00
latencytop.c
Makefile	kbuild: update config_data.gz only when the content of .config is changed	2021-05-11 14:04:16 +02:00
module-internal.h
module.c	module: limit enabling module.sig_enforce	2021-06-30 08:47:42 -04:00
module_signature.c	module: harden ELF info handling	2021-04-07 14:47:38 +02:00
module_signing.c	module: harden ELF info handling	2021-04-07 14:47:38 +02:00
notifier.c	kernel/notifier.c: intercept duplicate registrations to avoid infinite loops	2020-10-01 13:17:23 +02:00
nsproxy.c
padata.c	padata: add separate cpuhp node for CPUHP_PADATA_DEAD	2020-06-17 16:40:22 +02:00
panic.c
params.c
pid.c
pid_namespace.c
profile.c
ptrace.c	ptrace: make ptrace() fail if the tracee changed its pid unexpectedly	2021-05-26 12:05:15 +02:00
range.c
reboot.c	reboot: fix overflow parsing reboot cpu number	2020-11-18 19:20:30 +01:00
relay.c	kernel/relay.c: fix memleak on destroy relay channel	2020-08-26 10:40:51 +02:00
resource.c	/dev/mem: Revoke mappings when a driver claims the region	2020-06-24 17:50:35 +02:00
rseq.c
seccomp.c	seccomp: Add missing return in non-void function	2021-03-04 10:26:45 +01:00
signal.c	ptrace: fix task_join_group_stop() for the case when current is traced	2020-11-10 12:37:24 +01:00
smp.c	smp: Fix smp_call_function_single_async prototype	2021-05-14 09:44:33 +02:00
smpboot.c	kthread: Extract KTHREAD_IS_PER_CPU	2021-02-07 15:35:49 +01:00
smpboot.h
softirq.c
stackleak.c
stacktrace.c
stop_machine.c
sys.c	kernel/sys.c: avoid copying possible padding bytes in copy_to_user	2020-10-01 13:17:23 +02:00
sys_ni.c
sysctl-test.c	kernel/sysctl-test: Add null pointer test for sysctl.c:proc_dointvec()	2020-10-01 13:17:10 +02:00
sysctl.c	sysctl.c: fix underflow value setting risk in vm_table	2021-03-17 17:03:45 +01:00
sysctl_binary.c
task_work.c
taskstats.c	taskstats: fix data-race	2020-01-09 10:19:54 +01:00
test_kprobes.c
torture.c
tracepoint.c	tracepoint: Add tracepoint_probe_register_may_exist() for BPF tracing	2021-07-14 16:53:08 +02:00
tsacct.c
ucount.c
uid16.c
uid16.h
umh.c	usermodehelper: reset umask to default before executing user process	2020-10-14 10:32:58 +02:00
up.c	smp: Fix smp_call_function_single_async prototype	2021-05-14 09:44:33 +02:00
user-return-notifier.c
user.c
user_namespace.c
utsname.c
utsname_sysctl.c
watchdog.c	watchdog/softlockup: Enforce that timestamp is valid on boot	2020-02-24 08:36:52 +01:00
watchdog_hld.c
workqueue.c	workqueue: fix UAF in pwq_unbound_release_workfn()	2021-07-31 08:19:37 +02:00
workqueue_internal.h