linux-kernel - Re: [PATCH v4 4/6] crash: Use note name macros

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Message-ID: <Z4ZXMUn34wS8vxbx@e133380.arm.com>
Date: Tue, 14 Jan 2025 12:23:13 +0000
From: Dave Martin <Dave.Martin@....com>
To: Akihiko Odaki <akihiko.odaki@...nix.com>
Cc: Eric Biederman <ebiederm@...ssion.com>, Kees Cook <kees@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Mark Brown <broonie@...nel.org>, Baoquan He <bhe@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>, Dave Young <dyoung@...hat.com>,
	LEROY Christophe <christophe.leroy2@...soprasteria.com>,
	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
Subject: Re: [PATCH v4 4/6] crash: Use note name macros

On Sat, Jan 11, 2025 at 02:48:47PM +0900, Akihiko Odaki wrote:
> 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>

Reviewed-by: Dave Martin <Dave.Martin@....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
> 
>