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Eiichi Tsukata f01098c74b tracing/uprobe: Fix NULL pointer dereference in trace_uprobe_create() 
Just like the case of commit 8b05a3a7503c ("tracing/kprobes: Fix NULL
pointer dereference in trace_kprobe_create()"), writing an incorrectly
formatted string to uprobe_events can trigger NULL pointer dereference.

Reporeducer:

  # echo r > /sys/kernel/debug/tracing/uprobe_events

dmesg:

  BUG: kernel NULL pointer dereference, address: 0000000000000000
  #PF: supervisor read access in kernel mode
  #PF: error_code(0x0000) - not-present page
  PGD 8000000079d12067 P4D 8000000079d12067 PUD 7b7ab067 PMD 0
  Oops: 0000 [#1] PREEMPT SMP PTI
  CPU: 0 PID: 1903 Comm: bash Not tainted 5.2.0-rc3+ #15
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-2.fc30 04/01/2014
  RIP: 0010:strchr+0x0/0x30
  Code: c0 eb 0d 84 c9 74 18 48 83 c0 01 48 39 d0 74 0f 0f b6 0c 07 3a 0c 06 74 ea 19 c0 83 c8 01 c3 31 c0 c3 0f 1f 84 00 00 00 00 00 <0f> b6 07 89 f2 40 38 f0 75 0e eb 13 0f b6 47 01 48 83 c
  RSP: 0018:ffffb55fc0403d10 EFLAGS: 00010293

  RAX: ffff993ffb793400 RBX: 0000000000000000 RCX: ffffffffa4852625
  RDX: 0000000000000000 RSI: 000000000000002f RDI: 0000000000000000
  RBP: ffffb55fc0403dd0 R08: ffff993ffb793400 R09: 0000000000000000
  R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
  R13: ffff993ff9cc1668 R14: 0000000000000001 R15: 0000000000000000
  FS:  00007f30c5147700(0000) GS:ffff993ffda00000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 0000000000000000 CR3: 000000007b628000 CR4: 00000000000006f0
  Call Trace:
   trace_uprobe_create+0xe6/0xb10
   ? __kmalloc_track_caller+0xe6/0x1c0
   ? __kmalloc+0xf0/0x1d0
   ? trace_uprobe_create+0xb10/0xb10
   create_or_delete_trace_uprobe+0x35/0x90
   ? trace_uprobe_create+0xb10/0xb10
   trace_run_command+0x9c/0xb0
   trace_parse_run_command+0xf9/0x1eb
   ? probes_open+0x80/0x80
   __vfs_write+0x43/0x90
   vfs_write+0x14a/0x2a0
   ksys_write+0xa2/0x170
   do_syscall_64+0x7f/0x200
   entry_SYSCALL_64_after_hwframe+0x49/0xbe

Link: http://lkml.kernel.org/r/20190614074026.8045-1-devel@etsukata.com

Cc: stable@vger.kernel.org
Fixes: 0597c49c69d5 ("tracing/uprobes: Use dyn_event framework for uprobe events")
Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Eiichi Tsukata <devel@etsukata.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2019-06-14 16:51:14 -04:00
..
blktrace.c
blkcg: annotate implicit fall through
2019-03-13 14:31:12 -06:00
bpf_trace.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2019-05-07 22:03:58 -07:00
fgraph.c
tracing: Fix ftrace_graph_get_ret_stack() to use task and not current
2018-12-22 08:21:03 -05:00
ftrace_internal.h
ftrace: Create new ftrace_internal.h header
2018-12-08 20:54:06 -05:00
ftrace.c
tracing: avoid build warning with HAVE_NOP_MCOUNT
2019-06-14 16:34:57 -04:00
Kconfig
tracing: stop making gpio tracing configurable
2019-04-08 15:11:48 +02:00
Makefile
tracing: Add unified dynamic event framework
2018-12-08 20:54:09 -05:00
power-traces.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
preemptirq_delay_test.c
tracing: Use trace_clock_local() for looping in preemptirq_delay_test.c
2018-10-17 15:35:33 -04:00
ring_buffer_benchmark.c
ring-buffer: Fix mispelling of Calculate
2019-05-08 12:15:12 -04:00
ring_buffer.c
The major changes in this tracing update includes:
2019-05-15 16:05:47 -07:00
rpm-traces.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_benchmark.c
rcu: Rename cond_resched_rcu_qs() to cond_resched_tasks_rcu_qs()
2018-05-15 10:27:29 -07:00
trace_benchmark.h
tracing: Fix SPDX format headers to use C++ style comments
2018-08-16 19:08:06 -04:00
trace_branch.c
x86/uaccess, ftrace: Fix ftrace_likely_update() vs. SMAP
2019-04-03 11:02:24 +02:00
trace_clock.c
tracing: Add SPDX License format tags to tracing files
2018-08-16 19:08:06 -04:00
trace_dynevent.c
tracing: initialize variable in create_dyn_event()
2019-03-26 08:35:36 -04:00
trace_dynevent.h
tracing: Add unified dynamic event framework
2018-12-08 20:54:09 -05:00
trace_entries.h
tracing: Change the function format to display function names by perf
2019-02-11 14:53:43 -05:00
trace_event_perf.c
tracing/perf: Use strndup_user() instead of buggy open-coded version
2019-02-21 10:35:10 -05:00
trace_events_filter_test.h
tracing: Fix SPDX format headers to use C++ style comments
2018-08-16 19:08:06 -04:00
trace_events_filter.c
tracing: Avoid memory leak in predicate_parse()
2019-05-28 16:27:58 -04:00
trace_events_hist.c
tracing: Add a check_val() check before updating cond_snapshot() track_val
2019-05-21 12:48:07 -04:00
trace_events_trigger.c
tracing: Add trace_array parameter to create_event_filter()
2019-04-08 09:22:28 -04:00
trace_events.c
tracing: Fix partial reading of trace event's id file
2019-05-08 12:15:12 -04:00
trace_export.c
tracing: Add trigger file for trace_markers tracefs/ftrace/print
2018-05-29 08:28:53 -04:00
trace_functions_graph.c
tracing: Put a margin between flags and duration for wakeup tracers
2019-02-06 11:56:19 -05:00
trace_functions.c
tracing: Update stack trace skipping for ORC unwinder
2018-01-23 15:57:00 -05:00
trace_hwlat.c
tracing: Add SPDX License format tags to tracing files
2018-08-16 19:08:06 -04:00
trace_irqsoff.c
The biggest change for this release is in the histogram code.
2019-03-11 17:01:32 -07:00
trace_kdb.c
tracing: Silence GCC 9 array bounds warning
2019-05-25 23:04:30 -04:00
trace_kprobe_selftest.c
selftest/ftrace: Move kprobe selftest function to separate compile unit
2018-07-30 18:41:04 -04:00
trace_kprobe_selftest.h
tracing: Fix SPDX format headers to use C++ style comments
2018-08-16 19:08:06 -04:00
trace_kprobe.c
tracing: Use tracing error_log with probe events
2019-04-02 18:24:07 -04:00
trace_mmiotrace.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_nop.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_output.c
tracing: Fix out-of-range read in trace_stack_print()
2019-06-14 16:28:42 -04:00
trace_output.h
tracing: Fix SPDX format headers to use C++ style comments
2018-08-16 19:08:06 -04:00
trace_preemptirq.c
kprobes: Prohibit probing on hardirq tracers
2019-02-13 08:16:40 +01:00
trace_printk.c
tracing: Trivia spelling fix containerof() -> container_of()
2018-09-26 12:21:00 +03:00
trace_probe_tmpl.h
tracing: probeevent: Do not accumulate on ret variable
2019-05-08 12:15:11 -04:00
trace_probe.c
tracing: Replace kzalloc with kcalloc
2019-05-08 12:15:12 -04:00
trace_probe.h
tracing: uprobes: Re-enable $comm support for uprobe events
2019-05-08 12:15:11 -04:00
trace_sched_switch.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_sched_wakeup.c
tracing: Add conditional snapshot
2019-02-20 13:51:06 -05:00
trace_selftest_dynamic.c
ftrace: Mark function tracer test functions noinline/noclone
2018-01-23 15:57:29 -05:00
trace_selftest.c
function_graph: Have selftest also emulate tr->reset() as it did with tr->init()
2019-04-21 19:46:56 -04:00
trace_seq.c
tracing: Add SPDX License format tags to tracing files
2018-08-16 19:08:06 -04:00
trace_stack.c
tracing: Remove the last struct stack_trace usage
2019-04-29 12:37:56 +02:00
trace_stat.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_stat.h
tracing: Fix SPDX format headers to use C++ style comments
2018-08-16 19:08:06 -04:00
trace_syscalls.c
syscalls: Remove start and number from syscall_get_arguments() args
2019-04-05 09:26:43 -04:00
trace_uprobe.c
tracing/uprobe: Fix NULL pointer dereference in trace_uprobe_create()
2019-06-14 16:51:14 -04:00
trace.c
tracing: Make two symbols static
2019-06-14 16:49:26 -04:00
trace.h
tracing: Silence GCC 9 array bounds warning
2019-05-25 23:04:30 -04:00
tracing_map.c
tracing: Add SPDX License format tags to tracing files
2018-08-16 19:08:06 -04:00
tracing_map.h
tracing: Fix SPDX format headers to use C++ style comments
2018-08-16 19:08:06 -04:00