crash/0022-Fix-get_linux_banner_from_vmlinux-for-vmlinux-withou.patch

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From c74f375e0ef7cd9b593fa1d73c47505822c8f2a0 Mon Sep 17 00:00:00 2001
From: Kazuhito Hagio <k-hagio-ab@nec.com>
Date: Mon, 24 Jul 2023 17:25:12 +0900
Subject: [PATCH 22/30] Fix get_linux_banner_from_vmlinux() for vmlinux without
".rodata" symbol
As written in the previous patch, some recent kernels do not have the
".rodata" symbol. As a result, the get_linux_banner_from_vmlinux()
returns FALSE and the slower fallback routine is used.
Use "__start_rodata" symbol if the ".rodata" symbol is not available.
Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
---
kernel.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/kernel.c b/kernel.c
index 9801812387bd..2114700eecc8 100644
--- a/kernel.c
+++ b/kernel.c
@@ -11891,8 +11891,13 @@ int get_linux_banner_from_vmlinux(char *buf, size_t size)
{
struct bfd_section *sect;
long offset;
+ ulong start_rodata;
- if (!kernel_symbol_exists(".rodata"))
+ if (kernel_symbol_exists(".rodata"))
+ start_rodata = symbol_value(".rodata");
+ else if (kernel_symbol_exists("__start_rodata"))
+ start_rodata = symbol_value("__start_rodata");
+ else
return FALSE;
sect = bfd_get_section_by_name(st->bfd, ".rodata");
@@ -11905,7 +11910,7 @@ int get_linux_banner_from_vmlinux(char *buf, size_t size)
* value in vmlinux file, but relative offset to linux_banner
* object in .rodata section is idential.
*/
- offset = symbol_value("linux_banner") - symbol_value(".rodata");
+ offset = symbol_value("linux_banner") - start_rodata;
if (!bfd_get_section_contents(st->bfd,
sect,
--
2.37.1