[PATCH v2 1/1] Support member offset uts_namespace.name
by Alexander Egorenkov
The offset of the field 'init_uts_ns.name' has changed
since commit 9a56493f6942 ("uts: Use generic ns_common::count").
Link: https://lore.kernel.org/r/159644978167.604812.1773586504374412107.stgit@l...
Read the offset from VMCOREINFO if present. This requires a linux version
which exports the requisite offset in VMCOREINFO.
Signed-off-by: Alexander Egorenkov <egorenar(a)linux.ibm.com>
---
v1 -> v2:
* Use offset from VMCOREINFO
* Initialize corresponding entry in offset_table
defs.h | 1 +
kernel.c | 15 ++++++++++-----
symbols.c | 3 +++
3 files changed, 14 insertions(+), 5 deletions(-)
diff --git a/defs.h b/defs.h
index c899fe2..9a8030a 100644
--- a/defs.h
+++ b/defs.h
@@ -2104,6 +2104,7 @@ struct offset_table { /* stash of commonly-used offsets */
long inode_i_sb_list;
long irq_common_data_affinity;
long irq_desc_irq_common_data;
+ long uts_namespace_name;
};
struct size_table { /* stash of commonly-used sizes */
diff --git a/kernel.c b/kernel.c
index 5ae8cf1..9871637 100644
--- a/kernel.c
+++ b/kernel.c
@@ -230,16 +230,21 @@ kernel_init()
fprintf(fp, "%s\n\n", ctime_tz(&kt->date.tv_sec));
clean_exit(0);
}
-
+
+ MEMBER_OFFSET_INIT(uts_namespace_name, "uts_namespace", "name");
if (symbol_exists("system_utsname"))
readmem(symbol_value("system_utsname"), KVADDR, &kt->utsname,
sizeof(struct new_utsname), "system_utsname",
RETURN_ON_ERROR);
- else if (symbol_exists("init_uts_ns"))
- readmem(symbol_value("init_uts_ns") + sizeof(int),
- KVADDR, &kt->utsname, sizeof(struct new_utsname),
+ else if (symbol_exists("init_uts_ns")) {
+ long offset = sizeof(int);
+ if (VALID_MEMBER(uts_namespace_name))
+ offset = OFFSET(uts_namespace_name);
+
+ readmem(symbol_value("init_uts_ns") + offset,
+ KVADDR, &kt->utsname, sizeof(struct new_utsname),
"init_uts_ns", RETURN_ON_ERROR);
- else
+ } else
error(INFO, "cannot access utsname information\n\n");
if (CRASHDEBUG(1)) {
diff --git a/symbols.c b/symbols.c
index d22fb1d..3dd5fa1 100644
--- a/symbols.c
+++ b/symbols.c
@@ -10585,6 +10585,9 @@ dump_offset_table(char *spec, ulong makestruct)
fprintf(fp, " xa_node_shift: %ld\n",
OFFSET(xa_node_shift));
+ fprintf(fp, " uts_namespace_name: %ld\n",
+ OFFSET(uts_namespace_name));
+
fprintf(fp, "\n size_table:\n");
fprintf(fp, " page: %ld\n", SIZE(page));
fprintf(fp, " page_flags: %ld\n", SIZE(page_flags));
--
2.26.2
4 years
- 2
- 1