From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Helge Deller <deller@gmx.de>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Andrew Morton <akpm@linux-foundation.org>,
"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
Arnd Bergmann <arnd@arndb.de>, Kees Cook <keescook@chromium.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-ia64@vger.kernel.org, linux-parisc@vger.kernel.org,
linux-arch@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH v1 04/10] asm-generic: Use HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR to define associated stubs
Date: Tue, 12 Oct 2021 08:11:09 +0200 [thread overview]
Message-ID: <09bcd71a-baae-92b7-4c89-c8d446396d1c@csgroup.eu> (raw)
In-Reply-To: <91b38fce-8a5c-ccc7-fba5-b75b9769d4fc@gmx.de>
Le 12/10/2021 à 08:02, Helge Deller a écrit :
> On 10/11/21 17:25, Christophe Leroy wrote:
>> Use HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR instead of 'dereference_function_descriptor'
>> to know whether arch has function descriptors.
>>
>> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
>> ---
>> arch/ia64/include/asm/sections.h | 4 ++--
>> arch/parisc/include/asm/sections.h | 6 ++++--
>> arch/powerpc/include/asm/sections.h | 6 ++++--
>> include/asm-generic/sections.h | 3 ++-
>> 4 files changed, 12 insertions(+), 7 deletions(-)
>>
>> diff --git a/arch/ia64/include/asm/sections.h b/arch/ia64/include/asm/sections.h
>> index 35f24e52149a..80f5868afb06 100644
>> --- a/arch/ia64/include/asm/sections.h
>> +++ b/arch/ia64/include/asm/sections.h
>> @@ -7,6 +7,8 @@
>> * David Mosberger-Tang <davidm@hpl.hp.com>
>> */
>>
>> +#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1
>> +
>> #include <linux/elf.h>
>> #include <linux/uaccess.h>
>> #include <asm-generic/sections.h>
>> @@ -27,8 +29,6 @@ extern char __start_gate_brl_fsys_bubble_down_patchlist[], __end_gate_brl_fsys_b
>> extern char __start_unwind[], __end_unwind[];
>> extern char __start_ivt_text[], __end_ivt_text[];
>>
>> -#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1
>> -
>> #undef dereference_function_descriptor
>> static inline void *dereference_function_descriptor(void *ptr)
>> {
>> diff --git a/arch/parisc/include/asm/sections.h b/arch/parisc/include/asm/sections.h
>> index bb52aea0cb21..2e781ee19b66 100644
>> --- a/arch/parisc/include/asm/sections.h
>> +++ b/arch/parisc/include/asm/sections.h
>> @@ -2,6 +2,10 @@
>> #ifndef _PARISC_SECTIONS_H
>> #define _PARISC_SECTIONS_H
>>
>> +#ifdef CONFIG_64BIT
>> +#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1
>> +#endif
>> +
>> /* nothing to see, move along */
>> #include <asm-generic/sections.h>
>>
>> @@ -9,8 +13,6 @@ extern char __alt_instructions[], __alt_instructions_end[];
>>
>> #ifdef CONFIG_64BIT
>>
>> -#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1
>> -
>> #undef dereference_function_descriptor
>> void *dereference_function_descriptor(void *);
>>
>> diff --git a/arch/powerpc/include/asm/sections.h b/arch/powerpc/include/asm/sections.h
>> index 32e7035863ac..b7f1ba04e756 100644
>> --- a/arch/powerpc/include/asm/sections.h
>> +++ b/arch/powerpc/include/asm/sections.h
>> @@ -8,6 +8,10 @@
>>
>> #define arch_is_kernel_initmem_freed arch_is_kernel_initmem_freed
>>
>> +#ifdef PPC64_ELF_ABI_v1
>> +#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1
>> +#endif
>> +
>> #include <asm-generic/sections.h>
>>
>> extern bool init_mem_is_free;
>> @@ -69,8 +73,6 @@ static inline int overlaps_kernel_text(unsigned long start, unsigned long end)
>>
>> #ifdef PPC64_ELF_ABI_v1
>>
>> -#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1
>> -
>> #undef dereference_function_descriptor
>> static inline void *dereference_function_descriptor(void *ptr)
>> {
>> diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
>> index d16302d3eb59..1db5cfd69817 100644
>> --- a/include/asm-generic/sections.h
>> +++ b/include/asm-generic/sections.h
>> @@ -59,7 +59,8 @@ extern char __noinstr_text_start[], __noinstr_text_end[];
>> extern __visible const void __nosave_begin, __nosave_end;
>>
>> /* Function descriptor handling (if any). Override in asm/sections.h */
>> -#ifndef dereference_function_descriptor
>> +#ifdef HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR
>> +#else
>
> why not
> #ifndef HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR
> instead of #if/#else ?
To avoid changing it again in patch 6, or getting an ugly #ifndef/#else
at the end.
>
>> #define dereference_function_descriptor(p) ((void *)(p))
>> #define dereference_kernel_function_descriptor(p) ((void *)(p))
>> #endif
>>
>
next prev parent reply other threads:[~2021-10-12 6:11 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-11 15:25 [PATCH v1 00/10] Fix LKDTM for PPC64/IA64/PARISC Christophe Leroy
2021-10-11 15:25 ` [PATCH v1 01/10] powerpc: Move 'struct ppc64_opd_entry' back into asm/elf.h Christophe Leroy
2021-10-12 7:10 ` Michael Ellerman
2021-10-12 8:02 ` Arnd Bergmann
2021-10-13 6:59 ` Kees Cook
2021-10-11 15:25 ` [PATCH v1 02/10] powerpc: Rename 'funcaddr' to 'addr' in 'struct ppc64_opd_entry' Christophe Leroy
2021-10-13 6:59 ` Kees Cook
2021-10-11 15:25 ` [PATCH v1 03/10] ia64: Rename 'ip' to 'addr' in 'struct fdesc' Christophe Leroy
2021-10-13 6:59 ` Kees Cook
2021-10-11 15:25 ` [PATCH v1 04/10] asm-generic: Use HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR to define associated stubs Christophe Leroy
2021-10-12 6:02 ` Helge Deller
2021-10-12 6:11 ` Christophe Leroy [this message]
2021-10-12 6:48 ` Helge Deller
2021-10-13 7:00 ` Kees Cook
2021-10-14 7:20 ` Christophe Leroy
2021-10-11 15:25 ` [PATCH v1 05/10] asm-generic: Define 'funct_descr_t' to commonly describe function descriptors Christophe Leroy
2021-10-13 7:01 ` Kees Cook
2021-10-13 7:23 ` Christophe Leroy
2021-10-13 7:27 ` Kees Cook
2021-10-11 15:25 ` [PATCH v1 06/10] asm-generic: Refactor dereference_[kernel]_function_descriptor() Christophe Leroy
2021-10-13 7:02 ` Kees Cook
2021-10-13 11:20 ` Christophe Leroy
2021-10-13 11:34 ` Arnd Bergmann
2021-10-11 15:25 ` [PATCH v1 07/10] lkdtm: Force do_nothing() out of line Christophe Leroy
2021-10-13 7:02 ` Kees Cook
2021-10-11 15:25 ` [PATCH v1 08/10] lkdtm: Really write into kernel text in WRITE_KERN Christophe Leroy
2021-10-13 7:05 ` Kees Cook
2021-10-13 7:29 ` Christophe Leroy
2021-10-11 15:25 ` [PATCH v1 09/10] lkdtm: Fix lkdtm_EXEC_RODATA() Christophe Leroy
2021-10-13 7:09 ` Kees Cook
2021-10-13 7:35 ` Christophe Leroy
2021-10-13 7:23 ` Kees Cook
2021-10-13 7:39 ` Christophe Leroy
2021-10-13 7:48 ` Christophe Leroy
2021-10-13 12:45 ` Christophe Leroy
2021-10-11 15:25 ` [PATCH v1 10/10] lkdtm: Fix execute_[user]_location() Christophe Leroy
2021-10-13 7:16 ` Kees Cook
2021-10-13 12:00 ` Christophe Leroy
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