From: Nicholas Piggin <npiggin@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>,
Arnd Bergmann <arnd@arndb.de>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
Helge Deller <deller@gmx.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
Kees Cook <keescook@chromium.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Paul Mackerras <paulus@samba.org>
Cc: linux-arch@vger.kernel.org, linux-ia64@vger.kernel.org,
linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v2 02/13] powerpc: Rename 'funcaddr' to 'addr' in 'struct ppc64_opd_entry'
Date: Fri, 15 Oct 2021 16:01:26 +1000 [thread overview]
Message-ID: <1634277517.7t2t049cd5.astroid@bobo.none> (raw)
In-Reply-To: <49f59a8bf2c4d95cfaa03bd3dd3c1569822ad6ba.1634190022.git.christophe.leroy@csgroup.eu>
Excerpts from Christophe Leroy's message of October 14, 2021 3:49 pm:
> There are three architectures with function descriptors, try to
> have common names for the address they contain in order to
> refactor some functions into generic functions later.
>
> powerpc has 'funcaddr'
> ia64 has 'ip'
> parisc has 'addr'
>
> Vote for 'addr' and update 'struct ppc64_opd_entry' accordingly.
It is the "address of the entry point of the function" according to
powerpc ELF spec, so addr seems fine.
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
>
> Reviewed-by: Kees Cook <keescook@chromium.org>
> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
> ---
> arch/powerpc/include/asm/elf.h | 2 +-
> arch/powerpc/include/asm/sections.h | 2 +-
> arch/powerpc/kernel/module_64.c | 6 +++---
> 3 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/elf.h b/arch/powerpc/include/asm/elf.h
> index a4406714c060..bb0f278f9ed4 100644
> --- a/arch/powerpc/include/asm/elf.h
> +++ b/arch/powerpc/include/asm/elf.h
> @@ -178,7 +178,7 @@ void relocate(unsigned long final_address);
>
> /* There's actually a third entry here, but it's unused */
> struct ppc64_opd_entry {
> - unsigned long funcaddr;
> + unsigned long addr;
> unsigned long r2;
> };
>
> diff --git a/arch/powerpc/include/asm/sections.h b/arch/powerpc/include/asm/sections.h
> index 6e4af4492a14..32e7035863ac 100644
> --- a/arch/powerpc/include/asm/sections.h
> +++ b/arch/powerpc/include/asm/sections.h
> @@ -77,7 +77,7 @@ static inline void *dereference_function_descriptor(void *ptr)
> struct ppc64_opd_entry *desc = ptr;
> void *p;
>
> - if (!get_kernel_nofault(p, (void *)&desc->funcaddr))
> + if (!get_kernel_nofault(p, (void *)&desc->addr))
> ptr = p;
> return ptr;
> }
> diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c
> index 6baa676e7cb6..82908c9be627 100644
> --- a/arch/powerpc/kernel/module_64.c
> +++ b/arch/powerpc/kernel/module_64.c
> @@ -72,11 +72,11 @@ static func_desc_t func_desc(unsigned long addr)
> }
> static unsigned long func_addr(unsigned long addr)
> {
> - return func_desc(addr).funcaddr;
> + return func_desc(addr).addr;
> }
> static unsigned long stub_func_addr(func_desc_t func)
> {
> - return func.funcaddr;
> + return func.addr;
> }
> static unsigned int local_entry_offset(const Elf64_Sym *sym)
> {
> @@ -187,7 +187,7 @@ static int relacmp(const void *_x, const void *_y)
> static unsigned long get_stubs_size(const Elf64_Ehdr *hdr,
> const Elf64_Shdr *sechdrs)
> {
> - /* One extra reloc so it's always 0-funcaddr terminated */
> + /* One extra reloc so it's always 0-addr terminated */
> unsigned long relocs = 1;
> unsigned i;
>
> --
> 2.31.1
>
>
>
next prev parent reply other threads:[~2021-10-15 6:02 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-14 5:49 [PATCH v2 00/13] Fix LKDTM for PPC64/IA64/PARISC Christophe Leroy
2021-10-14 5:49 ` [PATCH v2 01/13] powerpc: Move 'struct ppc64_opd_entry' back into asm/elf.h Christophe Leroy
2021-10-14 21:26 ` Daniel Axtens
2021-10-15 5:57 ` Nicholas Piggin
2021-10-14 5:49 ` [PATCH v2 02/13] powerpc: Rename 'funcaddr' to 'addr' in 'struct ppc64_opd_entry' Christophe Leroy
2021-10-14 21:45 ` Daniel Axtens
2021-10-15 4:59 ` Christophe Leroy
2021-10-15 6:01 ` Nicholas Piggin [this message]
2021-10-14 5:49 ` [PATCH v2 03/13] powerpc: Remove func_descr_t Christophe Leroy
2021-10-14 22:17 ` Daniel Axtens
2021-10-15 5:19 ` Christophe Leroy
2021-10-15 6:11 ` Nicholas Piggin
2021-10-14 5:49 ` [PATCH v2 04/13] powerpc: Prepare func_desc_t for refactorisation Christophe Leroy
2021-10-14 5:49 ` [PATCH v2 05/13] ia64: Rename 'ip' to 'addr' in 'struct fdesc' Christophe Leroy
2021-10-14 5:49 ` [PATCH v2 06/13] asm-generic: Use HAVE_FUNCTION_DESCRIPTORS to define associated stubs Christophe Leroy
2021-10-15 6:16 ` Nicholas Piggin
2021-10-15 6:24 ` Christophe Leroy
2021-10-15 8:02 ` Nicholas Piggin
2021-10-15 11:52 ` Nicholas Piggin
2021-10-14 5:49 ` [PATCH v2 07/13] asm-generic: Define 'func_desc_t' to commonly describe function descriptors Christophe Leroy
2021-10-14 6:52 ` Arnd Bergmann
2021-10-14 5:49 ` [PATCH v2 08/13] asm-generic: Refactor dereference_[kernel]_function_descriptor() Christophe Leroy
2021-10-15 7:00 ` Nicholas Piggin
2021-10-14 5:49 ` [PATCH v2 09/13] lkdtm: Force do_nothing() out of line Christophe Leroy
2021-10-14 5:49 ` [PATCH v2 10/13] lkdtm: Really write into kernel text in WRITE_KERN Christophe Leroy
2021-10-14 5:50 ` [PATCH v2 11/13] lkdtm: Fix lkdtm_EXEC_RODATA() Christophe Leroy
2021-10-15 21:32 ` Kees Cook
2021-10-16 6:41 ` Christophe Leroy
2021-10-17 7:50 ` Christophe Leroy
2021-10-14 5:50 ` [PATCH v2 12/13] lkdtm: Fix execute_[user]_location() Christophe Leroy
2021-10-15 21:31 ` Kees Cook
2021-10-16 6:42 ` Christophe Leroy
2021-11-16 15:07 ` Christophe Leroy
2021-10-14 5:50 ` [PATCH v2 13/13] lkdtm: Add a test for function descriptors protection Christophe Leroy
2021-10-15 21:35 ` Kees Cook
2021-10-16 6:28 ` Christophe Leroy
2021-10-14 21:35 ` [PATCH v2 00/13] Fix LKDTM for PPC64/IA64/PARISC Daniel Axtens
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