Compare commits
No commits in common. 'i10cs' and 'c9' have entirely different histories.
@ -1,125 +0,0 @@
|
|||||||
From c5913a960dfa07d64397e6b591e6f0d40ea0b503 Mon Sep 17 00:00:00 2001
|
|
||||||
From: HATAYAMA Daisuke <d.hatayama@fujitsu.com>
|
|
||||||
Date: Tue, 26 Sep 2023 02:55:49 -0400
|
|
||||||
Subject: [PATCH] trace: Support module memory layout change on Linux 6.4
|
|
||||||
|
|
||||||
Linux kernel introduced new module memory layout on Linux 6.4 at the
|
|
||||||
commit ac3b432 (module: replace module_layout with module_memory) and
|
|
||||||
crash utility supported it at the commit 7750e61 (Support module
|
|
||||||
memory layout change on Linux 6.4).
|
|
||||||
|
|
||||||
In the change, crash utility changed definition and usage of data
|
|
||||||
structure for kernel modules. However, crash trace also refers to the
|
|
||||||
data structures. As a result, with the crash utility with the change,
|
|
||||||
crash trace command results in segmentation fault:
|
|
||||||
|
|
||||||
crash> extend trace.so
|
|
||||||
/usr/lib64/crash/extensions/trace.so: shared object loaded
|
|
||||||
crash> trace show
|
|
||||||
Segmentation fault (core dumped)
|
|
||||||
|
|
||||||
To fix this issue, let's support the new definition and usage of
|
|
||||||
struct load_module in crash trace. This is at the same time intended
|
|
||||||
for crash trace to support the new module memory layout of the Linux
|
|
||||||
kernel.
|
|
||||||
|
|
||||||
On the other hand, there is still inevitable dependency left to size
|
|
||||||
of struct load_module, one of the data structures of crash utility, in
|
|
||||||
crash trace. struct symbol_table_data holds an array of objects of
|
|
||||||
struct load_module in member variable load_modules and we need to know
|
|
||||||
size of struct load_module in advance to refer to its elements.
|
|
||||||
|
|
||||||
struct symbol_table_data {
|
|
||||||
...snip...
|
|
||||||
int mods_installed;
|
|
||||||
struct load_module *current;
|
|
||||||
struct load_module *load_modules;
|
|
||||||
|
|
||||||
Due to this, once crash trace is built with the defs.h including
|
|
||||||
change of size of struct load_module, it can never be used with the
|
|
||||||
older crash utility that was built with a different size of struct
|
|
||||||
load_module.
|
|
||||||
|
|
||||||
Because there is no preferable way to tackle the dependency without
|
|
||||||
altering implementation of crash utility, we have no choice but accept
|
|
||||||
breaking backward-compatibility for the time being.
|
|
||||||
|
|
||||||
Signed-off-by: HATAYAMA Daisuke <d.hatayama@fujitsu.com>
|
|
||||||
---
|
|
||||||
trace.c | 49 +++++++++++++++++++++++++++++++++++++++++++++----
|
|
||||||
1 file changed, 45 insertions(+), 4 deletions(-)
|
|
||||||
|
|
||||||
diff --git a/trace.c b/trace.c
|
|
||||||
index c33907f..9e51707 100644
|
|
||||||
--- a/trace.c
|
|
||||||
+++ b/trace.c
|
|
||||||
@@ -2219,14 +2219,11 @@ fail:
|
|
||||||
return -1;
|
|
||||||
}
|
|
||||||
|
|
||||||
-static int save_proc_kallsyms(int fd)
|
|
||||||
+static void __save_proc_kallsyms_mod_legacy(void)
|
|
||||||
{
|
|
||||||
int i;
|
|
||||||
struct syment *sp;
|
|
||||||
|
|
||||||
- for (sp = st->symtable; sp < st->symend; sp++)
|
|
||||||
- tmp_fprintf("%lx %c %s\n", sp->value, sp->type, sp->name);
|
|
||||||
-
|
|
||||||
for (i = 0; i < st->mods_installed; i++) {
|
|
||||||
struct load_module *lm = &st->load_modules[i];
|
|
||||||
|
|
||||||
@@ -2239,6 +2236,50 @@ static int save_proc_kallsyms(int fd)
|
|
||||||
sp->name, lm->mod_name);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
+}
|
|
||||||
+
|
|
||||||
+#ifdef MODULE_MEMORY
|
|
||||||
+static void __save_proc_kallsyms_mod_v6_4(void)
|
|
||||||
+{
|
|
||||||
+ int i, t;
|
|
||||||
+ struct syment *sp;
|
|
||||||
+
|
|
||||||
+ for (i = 0; i < st->mods_installed; i++) {
|
|
||||||
+ struct load_module *lm = &st->load_modules[i];
|
|
||||||
+
|
|
||||||
+ for_each_mod_mem_type(t) {
|
|
||||||
+ if (!lm->symtable[t])
|
|
||||||
+ continue;
|
|
||||||
+
|
|
||||||
+ for (sp = lm->symtable[t]; sp <= lm->symend[t]; sp++) {
|
|
||||||
+ if (!strncmp(sp->name, "_MODULE_", strlen("_MODULE_")))
|
|
||||||
+ continue;
|
|
||||||
+
|
|
||||||
+ /* Currently sp->type for modules is not trusted */
|
|
||||||
+ tmp_fprintf("%lx %c %s\t[%s]\n", sp->value, 'm',
|
|
||||||
+ sp->name, lm->mod_name);
|
|
||||||
+ }
|
|
||||||
+ }
|
|
||||||
+ }
|
|
||||||
+}
|
|
||||||
+#else
|
|
||||||
+#define MODULE_MEMORY() (0)
|
|
||||||
+static inline void __save_proc_kallsyms_mod_v6_4(void)
|
|
||||||
+{
|
|
||||||
+}
|
|
||||||
+#endif
|
|
||||||
+
|
|
||||||
+static int save_proc_kallsyms(int fd)
|
|
||||||
+{
|
|
||||||
+ struct syment *sp;
|
|
||||||
+
|
|
||||||
+ for (sp = st->symtable; sp < st->symend; sp++)
|
|
||||||
+ tmp_fprintf("%lx %c %s\n", sp->value, sp->type, sp->name);
|
|
||||||
+
|
|
||||||
+ if (MODULE_MEMORY())
|
|
||||||
+ __save_proc_kallsyms_mod_v6_4();
|
|
||||||
+ else
|
|
||||||
+ __save_proc_kallsyms_mod_legacy();
|
|
||||||
|
|
||||||
if (tmp_file_record_size4(fd))
|
|
||||||
return -1;
|
|
||||||
--
|
|
||||||
2.40.1
|
|
||||||
|
|
||||||
Loading…
Reference in new issue