linux-kernel - [PATCH v3 2/3] crash_dump: Add vmcore_elf32_check

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Message-Id: <1454946278-13859-3-git-send-email-daniel.wagner@bmw-carit.de>
Date:	Mon,  8 Feb 2016 16:44:37 +0100
From:	Daniel Wagner <daniel.wagner@...-carit.de>
To:	"Maciej W. Rozycki" <macro@...tec.com>
Cc:	Ralf Baechle <ralf@...ux-mips.org>, linux-kernel@...r.kernel.org,
	linux-mips@...ux-mips.org,
	Daniel Wagner <daniel.wagner@...-carit.de>
Subject: [PATCH v3 2/3] crash_dump: Add vmcore_elf32_check_arch

parse_crash_elf{32|64}_headers will check the headers via the
elf_check_arch respectively vmcore_elf64_check_arch macro.

The MIPS architecture implements those two macros differently.
In order to make the differentiation more explicit, let's introduce
an vmcore_elf32_check_arch to allow the archs to overwrite it.

Signed-off-by: Daniel Wagner <daniel.wagner@...-carit.de>
Suggested-by: Maciej W. Rozycki <macro@...tec.com>
---
 fs/proc/vmcore.c           | 2 +-
 include/linux/crash_dump.h | 8 ++++++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 4e61388..c8ed209 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -1068,7 +1068,7 @@ static int __init parse_crash_elf32_headers(void)
 	/* Do some basic Verification. */
 	if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 ||
 		(ehdr.e_type != ET_CORE) ||
-		!elf_check_arch(&ehdr) ||
+		!vmcore_elf32_check_arch(&ehdr) ||
 		ehdr.e_ident[EI_CLASS] != ELFCLASS32||
 		ehdr.e_ident[EI_VERSION] != EV_CURRENT ||
 		ehdr.e_version != EV_CURRENT ||
diff --git a/include/linux/crash_dump.h b/include/linux/crash_dump.h
index 3849fce..3873697 100644
--- a/include/linux/crash_dump.h
+++ b/include/linux/crash_dump.h
@@ -34,9 +34,13 @@ void vmcore_cleanup(void);
 
 /*
  * Architecture code can redefine this if there are any special checks
- * needed for 64-bit ELF vmcores. In case of 32-bit only architecture,
- * this can be set to zero.
+ * needed for 32-bit ELF or 64-bit ELF vmcores.  In case of 32-bit
+ * only architecture, vmcore_elf64_check_arch can be set to zero.
  */
+#ifndef vmcore_elf32_check_arch
+#define vmcore_elf32_check_arch(x) elf_check_arch(x)
+#endif
+
 #ifndef vmcore_elf64_check_arch
 #define vmcore_elf64_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x))
 #endif
-- 
2.5.0