diff options
| author | Steven Rostedt <rostedt@goodmis.org> | 2025-03-27 05:03:04 +0300 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2025-03-28 15:39:56 +0300 |
| commit | 028a58ec154257e618c27fb0eba8d9e30379bc3d (patch) | |
| tree | 83236be184c6fef447d01d2b9805d8db72047dec | |
| parent | 35a380ddbc653c07ee64e2a74c274b9835b0efc2 (diff) | |
| download | linux-028a58ec154257e618c27fb0eba8d9e30379bc3d.tar.xz | |
tracing: Use _text and the kernel offset in last_boot_info
Instead of using kaslr_offset() just record the location of "_text". This
makes it possible for user space to use either the System.map or
/proc/kallsyms as what to map all addresses to functions with.
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20250326220304.38dbedcd@gandalf.local.home
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
| -rw-r--r-- | kernel/trace/trace.c | 18 |
1 files changed, 6 insertions, 12 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index fa17397fdc1f..14c38fcd6f9e 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -51,7 +51,7 @@ #include <linux/workqueue.h> #include <linux/sort.h> -#include <asm/setup.h> /* COMMAND_LINE_SIZE and kaslr_offset() */ +#include <asm/setup.h> /* COMMAND_LINE_SIZE */ #include "trace.h" #include "trace_output.h" @@ -5995,7 +5995,7 @@ struct trace_mod_entry { }; struct trace_scratch { - unsigned long kaslr_addr; + unsigned long text_addr; unsigned long nr_entries; struct trace_mod_entry entries[]; }; @@ -6133,11 +6133,7 @@ static void update_last_data(struct trace_array *tr) kfree_rcu(module_delta, rcu); /* Set the persistent ring buffer meta data to this address */ -#ifdef CONFIG_RANDOMIZE_BASE - tscratch->kaslr_addr = kaslr_offset(); -#else - tscratch->kaslr_addr = 0; -#endif + tscratch->text_addr = (unsigned long)_text; } /** @@ -6996,7 +6992,7 @@ static void show_last_boot_header(struct seq_file *m, struct trace_array *tr) * should not be the same as the current boot. */ if (tscratch && (tr->flags & TRACE_ARRAY_FL_LAST_BOOT)) - seq_printf(m, "%lx\t[kernel]\n", tscratch->kaslr_addr); + seq_printf(m, "%lx\t[kernel]\n", tscratch->text_addr); else seq_puts(m, "# Current\n"); } @@ -9465,10 +9461,8 @@ static void setup_trace_scratch(struct trace_array *tr, tr->scratch = tscratch; tr->scratch_size = size; -#ifdef CONFIG_RANDOMIZE_BASE - if (tscratch->kaslr_addr) - tr->text_delta = kaslr_offset() - tscratch->kaslr_addr; -#endif + if (tscratch->text_addr) + tr->text_delta = (unsigned long)_text - tscratch->text_addr; if (struct_size(tscratch, entries, tscratch->nr_entries) > size) goto reset; |