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linux-6.13.y
linux/kernel/trace
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Steven Rostedt e47b97e85f ring-buffer: Use flush_kernel_vmap_range() over flush_dcache_folio() 
commit e4d4b8670c upstream.

Some architectures do not have data cache coherency between user and
kernel space. For these architectures, the cache needs to be flushed on
both the kernel and user addresses so that user space can see the updates
the kernel has made.

Instead of using flush_dcache_folio() and playing with virt_to_folio()
within the call to that function, use flush_kernel_vmap_range() which
takes the virtual address and does the work for those architectures that
need it.

This also fixes a bug where the flush of the reader page only flushed one
page. If the sub-buffer order is 1 or more, where the sub-buffer size
would be greater than a page, it would miss the rest of the sub-buffer
content, as the "reader page" is not just a page, but the size of a
sub-buffer.

Link: https://lore.kernel.org/all/CAG48ez3w0my4Rwttbc5tEbNsme6tc0mrSN95thjXUFaJ3aQ6SA@mail.gmail.com/

Cc: stable@vger.kernel.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Vincent Donnefort <vdonnefort@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mike Rapoport <rppt@kernel.org>
Link: https://lore.kernel.org/20250402144953.920792197@goodmis.org
Fixes: 117c39200d ("ring-buffer: Introducing ring-buffer mapping functions");
Suggested-by: Jann Horn <jannh@google.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-04-20 10:18:26 +02:00
..
rv
rv: Fix a typo
2024-10-04 19:09:23 -04:00
blktrace.c
blktrace: convert strncpy() to strscpy_pad()
2024-04-25 21:07:08 -07:00
bpf_trace.c
bpf: Use preempt_count() directly in bpf_send_signal_common()
2025-04-10 14:41:41 +02:00
bpf_trace.h
tracing/treewide: Remove second parameter of __assign_str()
2024-05-22 20:14:47 -04:00
error_report-traces.c
…
fgraph.c
fgraph: Add READ_ONCE() when accessing fgraph_array[]
2025-01-02 17:21:18 -05:00
fprobe.c
fprobe: Fix to allocate entry_data_size buffer with rethook instances
2024-03-01 09:18:24 +09:00
ftrace_internal.h
function_graph: Make fgraph_update_pid_func() a stub for !DYNAMIC_FTRACE
2024-06-10 18:08:23 -04:00
ftrace.c
ftrace: Properly merge notrace hashes
2025-04-20 10:18:21 +02:00
Kconfig
function_graph: Support recording and printing the function return address
2024-10-05 10:14:04 -04:00
kprobe_event_gen_test.c
…
Makefile
…
pid_list.c
trace/pid_list: Change gfp flags in pid_list_fill_irq()
2024-07-15 15:07:14 -04:00
pid_list.h
…
power-traces.c
…
preemptirq_delay_test.c
minmax: make generic MIN() and MAX() macros available everywhere
2024-07-28 15:49:18 -07:00
rethook.c
rethook: honor CONFIG_FTRACE_VALIDATE_RCU_IS_WATCHING in rethook_try_get()
2024-05-01 23:18:48 +09:00
ring_buffer_benchmark.c
ring-buffer: Use str_low_high() helper in ring_buffer_producer()
2024-10-19 11:12:25 -04:00
ring_buffer.c
ring-buffer: Use flush_kernel_vmap_range() over flush_dcache_folio()
2025-04-20 10:18:26 +02:00
rpm-traces.c
…
synth_event_gen_test.c
…
trace_benchmark.c
tracing: Improve benchmark test performance by using do_div()
2024-05-13 20:00:57 -04:00
trace_benchmark.h
…
trace_boot.c
…
trace_branch.c
tracing: Remove TRACE_EVENT_FL_FILTERED logic
2024-10-08 15:24:49 -04:00
trace_btf.c
tracing/probes: Fix to search structure fields correctly
2024-02-17 21:25:42 +09:00
trace_btf.h
…
trace_clock.c
tracing: Use atomic64_inc_return() in trace_clock_counter()
2024-10-09 19:59:49 -04:00
trace_dynevent.c
…
trace_dynevent.h
…
trace_entries.h
function_graph: Support recording and printing the function return address
2024-10-05 10:14:04 -04:00
trace_eprobe.c
tracing/eprobe: Fix to release eprobe when failed to add dyn_event
2024-12-08 23:25:09 +09:00
trace_event_perf.c
trace/trace_event_perf: remove duplicate samples on the first tracepoint event
2024-10-09 19:44:54 -04:00
trace_events_filter_test.h
…
trace_events_filter.c
tracing: Replace multiple deprecated strncpy with memcpy
2024-10-30 19:41:08 -04:00
trace_events_hist.c
tracing: Correct the refcount if the hist/hist_debug file fails to open
2025-04-10 14:42:01 +02:00
trace_events_inject.c
tracing: Have format file honor EVENT_FILE_FL_FREED
2024-08-07 18:12:46 -04:00
trace_events_synth.c
tracing: Do not add length to print format in synthetic events
2025-04-20 10:18:18 +02:00
trace_events_trigger.c
tracing: Have format file honor EVENT_FILE_FL_FREED
2024-08-07 18:12:46 -04:00
trace_events_user.c
tracepoints: Use new static branch API
2024-10-08 21:17:39 -04:00
trace_events.c
tracing: fix return value in __ftrace_event_enable_disable for TRACE_REG_UNREGISTER
2025-04-20 10:17:46 +02:00
trace_export.c
…
trace_fprobe.c
tracing: fprobe events: Fix possible UAF on modules
2025-04-20 10:18:18 +02:00
trace_functions_graph.c
tracing: Fix use-after-free in print_graph_function_flags during tracer switching
2025-04-10 14:42:05 +02:00
trace_functions.c
ftrace: Correct preemption accounting for function tracing.
2025-02-27 04:34:21 -08:00
trace_hwlat.c
tracing: Remove TRACE_EVENT_FL_FILTERED logic
2024-10-08 15:24:49 -04:00
trace_irqsoff.c
tracing: Fix use-after-free in print_graph_function_flags during tracer switching
2025-04-10 14:42:05 +02:00
trace_kdb.c
trace: kdb: Replace simple_strtoul with kstrtoul in kdb_ftdump
2024-11-02 08:33:13 +00:00
trace_kprobe_selftest.c
…
trace_kprobe_selftest.h
…
trace_kprobe.c
tracing/kprobes: Fix to free objects when failed to copy a symbol
2025-01-10 08:57:18 +09:00
trace_mmiotrace.c
tracing: Remove TRACE_EVENT_FL_FILTERED logic
2024-10-08 15:24:49 -04:00
trace_nop.c
…
trace_osnoise.c
tracing/osnoise: Fix possible recursive locking for cpus_read_lock()
2025-04-10 14:42:05 +02:00
trace_output.c
tracing: Check "%s" dereference via the field and not the TP_printk format
2024-12-17 11:40:11 -05:00
trace_output.h
…
trace_preemptirq.c
tracing: Fix archs that still call tracepoints without RCU watching
2024-12-05 09:28:58 -05:00
trace_printk.c
…
trace_probe_kernel.h
…
trace_probe_tmpl.h
tracing/probes: Support $argN in return probe (kprobe and fprobe)
2024-03-07 00:27:34 +09:00
trace_probe.c
tracing: probe-events: Add comments about entry data storing code
2025-04-20 10:17:52 +02:00
trace_probe.h
tracing: probe-events: Remove unused MAX_ARG_BUF_LEN macro
2025-03-13 13:07:55 +01:00
trace_recursion_record.c
…
trace_sched_switch.c
tracing: Replace strncpy() with strscpy() when copying comm
2024-11-01 14:37:31 -04:00
trace_sched_wakeup.c
tracing: Fix use-after-free in print_graph_function_flags during tracer switching
2025-04-10 14:42:05 +02:00
trace_selftest_dynamic.c
…
trace_selftest.c
Merge tag 'ftrace-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
2024-11-20 11:34:10 -08:00
trace_seq.c
…
trace_stack.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
trace_stat.c
…
trace_stat.h
…
trace_synth.h
…
trace_syscalls.c
tracing/perf: Add might_fault check to syscall probes
2024-10-09 17:09:46 -04:00
trace_uprobe.c
bpf: Fix theoretical prog_array UAF in __uprobe_perf_func()
2024-12-10 13:06:51 -08:00
trace.c
tracing: Fix using ret variable in tracing_set_tracer()
2025-02-27 04:34:22 -08:00
trace.h
tracing: Check "%s" dereference via the field and not the TP_printk format
2024-12-17 11:40:11 -05:00
tracing_map.c
tracing: Fix cmp_entries_dup() to respect sort() comparison rules
2024-12-04 10:38:24 -05:00
tracing_map.h
…