[Crash-utility] [PATCH] Fix for the invalid linux_banner pointer issue

[Lianbo Jiang]

Currently, crash may fail with the following error:

  # ./crash vmlinux /var/crash/127.0.0.1-2022-09-15-09:31:55/vmcore -s
  WARNING: invalid linux_banner pointer: 65762078756e694c
  crash: vmlinux and /var/crash/127.0.0.1-2022-09-15-09:31:55/vmcore do not match!

The reason is that the type of symbols in the data segment may be
defined as 'D' or 'd'. The crash only handled the type 'D', but it
didn't deal with the type 'd'. For example:

  # nm vmlinux |grep linux_banner
  ffffffff827cfa80 d linux_banner

Let's add the type 'd' recognition to solve such issue.

Signed-off-by: Lianbo Jiang <lijiang at redhat.com>
---
 kernel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel.c b/kernel.c
index a521ef30cdb0..aa030e8097ea 100644
--- a/kernel.c
+++ b/kernel.c
@@ -1060,7 +1060,7 @@ verify_version(void)
 	if (!(sp = symbol_search("linux_banner")))
 		error(FATAL, "linux_banner symbol does not exist?\n");
 	else if ((sp->type == 'R') || (sp->type == 'r') ||
-		(THIS_KERNEL_VERSION >= LINUX(2,6,11) && sp->type == 'D') ||
+		(THIS_KERNEL_VERSION >= LINUX(2,6,11) && (sp->type == 'D' || sp->type == 'd')) ||
 		 (machine_type("ARM") && sp->type == 'T') ||
 		 (machine_type("ARM64")))
 		linux_banner = symbol_value("linux_banner");
-- 
2.37.1