diff options
| author | Steven Rostedt <rostedt@goodmis.org> | 2025-03-05 11:45:40 -0500 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2025-03-28 08:39:26 -0400 |
| commit | bcba8d4dbe6880ce9883409df486de35d3946704 (patch) | |
| tree | 10a58b40eb6bb06e7fea43f4afdb245365e26dd6 /include/linux/ring_buffer.h | |
| parent | c73f0b69648501978e8b3e8fa7eef7f4197d0481 (diff) | |
ring-buffer: Use kaslr address instead of text delta
Instead of saving off the text and data pointers and using them to compare
with the current boot's text and data pointers, just save off the KASLR
offset. Then that can be used to figure out how to read the previous boots
buffer.
The last_boot_info will now show this offset, but only if it is for a
previous boot:
~# cat instances/boot_mapped/last_boot_info
39000000 [kernel]
~# echo function > instances/boot_mapped/current_tracer
~# cat instances/boot_mapped/last_boot_info
# Current
If the KASLR offset saved is for the current boot, the last_boot_info will
show the value of "current".
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/20250305164608.274956504@goodmis.org
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/ring_buffer.h')
| -rw-r--r-- | include/linux/ring_buffer.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h index 17fbb7855295..8de035f4f0d9 100644 --- a/include/linux/ring_buffer.h +++ b/include/linux/ring_buffer.h @@ -94,8 +94,7 @@ struct trace_buffer *__ring_buffer_alloc_range(unsigned long size, unsigned flag unsigned long range_size, struct lock_class_key *key); -bool ring_buffer_last_boot_delta(struct trace_buffer *buffer, long *text, - long *data); +bool ring_buffer_last_boot_delta(struct trace_buffer *buffer, unsigned long *kaslr_addr); /* * Because the ring buffer is generic, if other users of the ring buffer get |