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SubjectRe: [PATCH] [RFC] making uapi/linux/elfcore.h useful again

* Arnd Bergmann <arnd@arndb.de> wrote:

> After finding a bug in glibc the question came up how linux/elfcore.h
> is supposed to be used from user space. As far as I can tell, it's
> not possible, as it references data types that are simply unavailable
> there.
>
> The #ifndef __KERNEL__ section in that header dates back to when the
> file was introduced in linux-1.3.5, and presumably was meant to
> provide the structures for the libc sys/procfs.h implementation.
> However, this was never portable to architectures other than x86-32,
> and has been broken on that architecture at a later point.
>
> These are the steps that I needed to make it possible to include the
> header file, e.g. for libc self-testing in order to make sure the
> structures are compatible with its own:
>
> - drop the #ifndef __KERNEL__ section that are obviously useless
> and get in the way
>
> - change the pid_t references to __kernel_pid_t
>
> - Move required data from the private x86 asm/elf.h file into
> a new uapi/asm/elf.h. Some other architectures already do that,
> but most of them do not. Before applying the patch, we have
> to do this for all architectures
>
> - Change ELF_NGREG to an integer literal constant instead of
> a sizeof operation based on a private type.
>
> Cc: Joseph Myers <joseph@codesourcery.com>
> Cc: David Howells <dhowells@redhat.com>
> Cc: libc-alpha@sourceware.org
> Link: https://patchwork.ozlabs.org/patch/969540/
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> arch/x86/include/asm/elf.h | 24 +-----------------------
> arch/x86/include/uapi/asm/elf.h | 30 ++++++++++++++++++++++++++++++
> arch/x86/include/uapi/asm/signal.h | 2 +-
> include/uapi/linux/elf.h | 1 +
> include/uapi/linux/elfcore.h | 26 +++++---------------------
> 5 files changed, 38 insertions(+), 45 deletions(-)
> create mode 100644 arch/x86/include/uapi/asm/elf.h

Acked-by: Ingo Molnar <mingo@kernel.org>

I suspect this wants to go through -mm, or do you want to carry it?

Thanks,

Ingo

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