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/159644978167.604812.1773586504374412107.stgit@localhost.localdomain
Link: https://lkml.kernel.org/r/20200930102328.396488-1-egorenar@linux.ibm.com
Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Acked-by: lijiang <lijiang@redhat.com>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: "Eric W . Biederman" <ebiederm@xmission.com>
Cc: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/admin-guide/kdump/vmcoreinfo.rst b/Documentation/admin-guide/kdump/vmcoreinfo.rst
index e44a6c01f33622441342388a9c3979af940e16bb..3861a25faae18e7b44126b21f7c807f1fdd54b07 100644 (file)
--- a/Documentation/admin-guide/kdump/vmcoreinfo.rst
+++ b/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
 ---------------
 

diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index 4fcfe0b70c4e5e9bbc7cc75734fcca3ab0b5b783..825284baaf4660bd3d724a757fd7c51945066ece 100644 (file)
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -447,6 +447,7 @@ static int __init crash_save_vmcoreinfo_init(void)
        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);