linux-kernel - [PATCH v3 4/6] crash: Use note name macros

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Message-Id: <20250107-elf-v3-4-99cb505b1ab2@daynix.com>
Date: Tue, 07 Jan 2025 21:45:55 +0900
From: Akihiko Odaki <akihiko.odaki@...nix.com>
To: Eric Biederman <ebiederm@...ssion.com>, Kees Cook <kees@...nel.org>, 
 Catalin Marinas <catalin.marinas@....com>, Mark Brown <broonie@...nel.org>, 
 Dave Martin <Dave.Martin@....com>, Baoquan He <bhe@...hat.com>, 
 Vivek Goyal <vgoyal@...hat.com>, Dave Young <dyoung@...hat.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
 linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org, 
 kexec@...ts.infradead.org, binutils@...rceware.org, devel@...nix.com, 
 Akihiko Odaki <akihiko.odaki@...nix.com>
Subject: [PATCH v3 4/6] crash: Use note name macros

Use note name macros to match with the userspace's expectation.

Signed-off-by: Akihiko Odaki <akihiko.odaki@...nix.com>
Acked-by: Baoquan He <bhe@...hat.com>
---
 fs/proc/kcore.c             | 12 ++++++------
 include/linux/vmcore_info.h |  2 +-
 kernel/crash_core.c         |  2 +-
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index e376f48c4b8b..e5612313b8b4 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -34,8 +34,6 @@
 #include <asm/sections.h>
 #include "internal.h"
 
-#define CORE_STR "CORE"
-
 #ifndef ELF_CORE_EFLAGS
 #define ELF_CORE_EFLAGS	0
 #endif
@@ -119,7 +117,9 @@ static size_t get_kcore_size(int *nphdr, size_t *phdrs_len, size_t *notes_len,
 
 	*phdrs_len = *nphdr * sizeof(struct elf_phdr);
 	*notes_len = (4 * sizeof(struct elf_note) +
-		      3 * ALIGN(sizeof(CORE_STR), 4) +
+		      ALIGN(sizeof(NN_PRSTATUS), 4) +
+		      ALIGN(sizeof(NN_PRPSINFO), 4) +
+		      ALIGN(sizeof(NN_TASKSTRUCT), 4) +
 		      VMCOREINFO_NOTE_NAME_BYTES +
 		      ALIGN(sizeof(struct elf_prstatus), 4) +
 		      ALIGN(sizeof(struct elf_prpsinfo), 4) +
@@ -444,11 +444,11 @@ static ssize_t read_kcore_iter(struct kiocb *iocb, struct iov_iter *iter)
 			goto out;
 		}
 
-		append_kcore_note(notes, &i, CORE_STR, NT_PRSTATUS, &prstatus,
+		append_kcore_note(notes, &i, NN_PRSTATUS, NT_PRSTATUS, &prstatus,
 				  sizeof(prstatus));
-		append_kcore_note(notes, &i, CORE_STR, NT_PRPSINFO, &prpsinfo,
+		append_kcore_note(notes, &i, NN_PRPSINFO, NT_PRPSINFO, &prpsinfo,
 				  sizeof(prpsinfo));
-		append_kcore_note(notes, &i, CORE_STR, NT_TASKSTRUCT, current,
+		append_kcore_note(notes, &i, NN_TASKSTRUCT, NT_TASKSTRUCT, current,
 				  arch_task_struct_size);
 		/*
 		 * vmcoreinfo_size is mostly constant after init time, but it
diff --git a/include/linux/vmcore_info.h b/include/linux/vmcore_info.h
index e1dec1a6a749..1672801fd98c 100644
--- a/include/linux/vmcore_info.h
+++ b/include/linux/vmcore_info.h
@@ -8,7 +8,7 @@
 
 #define CRASH_CORE_NOTE_NAME	   "CORE"
 #define CRASH_CORE_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
-#define CRASH_CORE_NOTE_NAME_BYTES ALIGN(sizeof(CRASH_CORE_NOTE_NAME), 4)
+#define CRASH_CORE_NOTE_NAME_BYTES ALIGN(sizeof(NN_PRSTATUS), 4)
 #define CRASH_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
 
 /*
diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index 078fe5bc5a74..335b8425dd4b 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -436,7 +436,7 @@ void crash_save_cpu(struct pt_regs *regs, int cpu)
 	memset(&prstatus, 0, sizeof(prstatus));
 	prstatus.common.pr_pid = current->pid;
 	elf_core_copy_regs(&prstatus.pr_reg, regs);
-	buf = append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS,
+	buf = append_elf_note(buf, NN_PRSTATUS, NT_PRSTATUS,
 			      &prstatus, sizeof(prstatus));
 	final_note(buf);
 }

-- 
2.47.1