[59/95] kdump: append uts_namespace.name offset to VMCOREINFO

Commit Message

Andrew Morton Dec. 16, 2020, 4:45 a.m. UTC

From: Alexander Egorenkov <[e-mail]>
Subject: kdump: append uts_namespace.name offset to VMCOREINFO

The offset of the field 'init_uts_ns.name' has changed since commit
9a56493f6942 ("uts: Use generic ns_common::count").

Make the offset of the field 'uts_namespace.name' available in VMCOREINFO
because tools like 'crash-utility' and 'makedumpfile' must be able to read
it from crash dumps.

Link: https://lore.kernel.org/r/[e-mail]
Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Alexander Egorenkov <[e-mail]>
Acked-by: lijiang <[e-mail]>
Acked-by: Baoquan He <[e-mail]>
Cc: Dave Young <[e-mail]>
Cc: Vivek Goyal <[e-mail]>
Cc: "Eric W . Biederman" <[e-mail]>
Cc: Kirill Tkhai <[e-mail]>
Cc: Kees Cook <[e-mail]>
Cc: Christian Brauner <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 Documentation/admin-guide/kdump/vmcoreinfo.rst |    6 ++++++
 kernel/crash_core.c                            |    1 +
 2 files changed, 7 insertions(+)

Patch

--- a/Documentation/admin-guide/kdump/vmcoreinfo.rst~kdump-append-uts_namespacename-offset-to-vmcoreinfo
+++ a/Documentation/admin-guide/kdump/vmcoreinfo.rst
@@ -39,6 +39,12 @@  call.
 User-space tools can get the kernel name, host name, kernel release
 number, kernel version, architecture name and OS type from it.
 
+(uts_namespace, name)
+---------------------
+
+Offset of the name's member. Crash Utility and Makedumpfile get
+the start address of the init_uts_ns.name from this.
+
 node_online_map
 ---------------
 
--- a/kernel/crash_core.c~kdump-append-uts_namespacename-offset-to-vmcoreinfo
+++ a/kernel/crash_core.c
@@ -447,6 +447,7 @@  static int __init crash_save_vmcoreinfo_
 	VMCOREINFO_PAGESIZE(PAGE_SIZE);
 
 	VMCOREINFO_SYMBOL(init_uts_ns);
+	VMCOREINFO_OFFSET(uts_namespace, name);
 	VMCOREINFO_SYMBOL(node_online_map);
 #ifdef CONFIG_MMU
 	VMCOREINFO_SYMBOL_ARRAY(swapper_pg_dir);