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Daniel Borkmann 9c481b908b bpf: fix bpf_prog_array_copy_to_user warning from perf event prog query 
syzkaller tried to perform a prog query in perf_event_query_prog_array()
where struct perf_event_query_bpf had an ids_len of 1,073,741,353 and
thus causing a warning due to failed kcalloc() allocation out of the
bpf_prog_array_copy_to_user() helper. Given we cannot attach more than
64 programs to a perf event, there's no point in allowing huge ids_len.
Therefore, allow a buffer that would fix the maximum number of ids and
also add a __GFP_NOWARN to the temporary ids buffer.

Fixes: f371b304f1 ("bpf/tracing: allow user space to query prog array on the same tp")
Fixes: 0911287ce3 ("bpf: fix bpf_prog_array_copy_to_user() issues")
Reported-by: syzbot+cab5816b0edbabf598b3@syzkaller.appspotmail.com
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
 		2018-02-14 08:59:37 -08:00
..
Kconfig Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-01-17 00:10:42 -05:00
Makefile Tracing updates for 4.15: 2017-11-17 14:58:01 -08:00
blktrace.c blktrace: fix trace mutex deadlock 2017-11-27 12:03:58 -07:00
bpf_trace.c bpf: fix bpf_prog_array_copy_to_user warning from perf event prog query 2018-02-14 08:59:37 -08:00
ftrace.c ftrace: Remove incorrect setting of glob search field 2018-02-08 10:11:11 -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
ring_buffer.c vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
ring_buffer_benchmark.c ring-buffer: Have ring_buffer_alloc_read_page() return error on offline CPU 2017-08-02 14:23:02 -04:00
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.c vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
trace.h Tracing updates for 4.15: 2017-11-17 14:58:01 -08:00
trace_benchmark.c trace: Eliminate cond_resched_rcu_qs() in favor of cond_resched() 2017-12-04 10:28:58 -08:00
trace_benchmark.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace_branch.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace_clock.c
…
trace_entries.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace_event_perf.c perf/ftrace: Small cleanup 2017-10-16 18:13:28 -04:00
trace_events.c tracing: Make sure the parsed string always terminates with '\0' 2018-01-23 15:57:28 -05:00
trace_events_filter.c tracing: Fix parsing of globs with a wildcard at the beginning 2018-02-08 10:11:47 -05:00
trace_events_filter_test.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace_events_hist.c tracing: Reimplement log2 2017-10-04 13:10:39 -04:00
trace_events_trigger.c tracing: Update stack trace skipping for ORC unwinder 2018-01-23 15:57:00 -05:00
trace_export.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace_functions.c tracing: Update stack trace skipping for ORC unwinder 2018-01-23 15:57:00 -05:00
trace_functions_graph.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace_hwlat.c trace: make trace_hwlat timestamp y2038 safe 2017-05-08 17:15:15 -07:00
trace_irqsoff.c tracing: Add support for preempt and irq enable/disable events 2017-10-10 18:58:43 -04:00
trace_kdb.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace_kprobe.c error-injection: Separate error-injection from kprobe 2018-01-12 17:33:38 -08:00
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 sched/debug: Rename task-state printing helpers 2017-10-10 11:43:29 +02:00
trace_output.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace_printk.c
…
trace_probe.c tracing: Make traceprobe parsing code reusable 2017-10-04 13:06:44 -04:00
trace_probe.h tracing/kprobe: bpf: Check error injectable event is on function entry 2018-01-12 17:33:37 -08:00
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 Merge branch 'linus' into sched/core, to pick up fixes 2017-11-08 10:17:15 +01:00
trace_selftest.c Tracing updates for 4.15: 2017-11-17 14:58:01 -08:00
trace_selftest_dynamic.c ftrace: Mark function tracer test functions noinline/noclone 2018-01-23 15:57:29 -05:00
trace_seq.c
…
trace_stack.c tracing: Have stack trace not record if RCU is not watching 2017-12-14 20:48:22 -05:00
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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace_syscalls.c Tracing updates for 4.15: 2017-11-17 14:58:01 -08:00
trace_uprobe.c trace_uprobe: Display correct offset in uprobe_events 2018-01-23 15:57:29 -05:00
tracing_map.c tracing: Remove lookups from tracing_map hitcount 2017-10-04 13:05:42 -04:00
tracing_map.h Tracing updates for 4.15: 2017-11-17 14:58:01 -08:00