Linus Torvalds 6b3a707736 Merge branch 'page-refs' (page ref overflow) ... Merge page ref overflow branch. Jann Horn reported that he can overflow the page ref count with sufficient memory (and a filesystem that is intentionally extremely slow). Admittedly it's not exactly easy. To have more than four billion references to a page requires a minimum of 32GB of kernel memory just for the pointers to the pages, much less any metadata to keep track of those pointers. Jann needed a total of 140GB of memory and a specially crafted filesystem that leaves all reads pending (in order to not ever free the page references and just keep adding more). Still, we have a fairly straightforward way to limit the two obvious user-controllable sources of page references: direct-IO like page references gotten through get_user_pages(), and the splice pipe page duplication. So let's just do that. * branch page-refs: fs: prevent page refcount overflow in pipe_buf_get mm: prevent get_user_pages() from overflowing page refcount mm: add 'try_get_page()' helper function mm: make page ref count overflow check tighter and more explicit		2019-04-14 15:09:40 -07:00
..
Kconfig	kbuild: compute false-positive -Wmaybe-uninitialized cases in Kconfig	2019-02-27 21:43:20 +09:00
Makefile	tracing: Add unified dynamic event framework	2018-12-08 20:54:09 -05:00
blktrace.c	blkcg: annotate implicit fall through	2019-03-13 14:31:12 -06:00
bpf_trace.c	Merge branch 'linus' into perf/core, to pick up fixes	2019-02-28 08:27:17 +01:00
fgraph.c	tracing: Fix ftrace_graph_get_ret_stack() to use task and not current	2018-12-22 08:21:03 -05:00
ftrace.c	ftrace: Fix warning using plain integer as NULL & spelling corrections	2019-03-26 08:35:36 -04:00
ftrace_internal.h	ftrace: Create new ftrace_internal.h header	2018-12-08 20:54:06 -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.c	tracing: kdb: Fix ftdump to not sleep	2019-03-13 09:46:10 -04:00
ring_buffer_benchmark.c	tracing: Add SPDX License format tags to tracing files	2018-08-16 19:08:06 -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	Merge branch 'page-refs' (page ref overflow)	2019-04-14 15:09:40 -07:00
trace.h	tracing: Add conditional snapshot	2019-02-20 13:51:06 -05:00
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	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	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.c	tracing: Use str_has_prefix() instead of using fixed sizes	2018-12-22 22:51:54 -05:00
trace_events_filter.c	The biggest change for this release is in the histogram code.	2019-03-11 17:01:32 -07:00
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_hist.c	tracing: Remove unnecessary var_ref destroy in track_data_destroy()	2019-03-26 08:34:00 -04:00
trace_events_trigger.c	tracing: Fix memory leak in set_trigger_filter()	2018-12-11 13:50:19 -05:00
trace_export.c	tracing: Add trigger file for trace_markers tracefs/ftrace/print	2018-05-29 08:28:53 -04:00
trace_functions.c	tracing: Update stack trace skipping for ORC unwinder	2018-01-23 15:57:00 -05:00
trace_functions_graph.c	tracing: Put a margin between flags and duration for wakeup tracers	2019-02-06 11:56:19 -05:00
trace_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: kdb: Fix ftdump to not sleep	2019-03-13 09:46:10 -04:00
trace_kprobe.c	This contains a series of last minute clean ups, small fixes and	2019-03-15 14:47:02 -07:00
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_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: Simplify printf'ing in seq_print_sym	2018-12-22 08:21:06 -05:00
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.c	tracing/probe: Check event/group naming rule at parsing	2019-03-14 19:54:11 -04:00
trace_probe.h	tracing/probe: Check the size of argument name and body	2019-03-14 19:53:57 -04:00
trace_probe_tmpl.h	tracing: probeevent: Correctly update remaining space in dynamic area	2019-02-11 15:58:30 -05:00
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.c	fgraph: Add new fgraph_ops structure to enable function graph hooks	2018-12-08 20:54:07 -05:00
trace_selftest_dynamic.c	ftrace: Mark function tracer test functions noinline/noclone	2018-01-23 15:57:29 -05:00
trace_seq.c	tracing: Add SPDX License format tags to tracing files	2018-08-16 19:08:06 -04:00
trace_stack.c	tracing: Use the return of str_has_prefix() to remove open coded numbers	2018-12-22 22:52:30 -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	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	This contains a series of last minute clean ups, small fixes and	2019-03-15 14:47:02 -07:00
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