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[RFC,v2,1/2] binfmt_elf: Wire up AT_HWCAP3 at AT_HWCAP4

Message ID 20241004-arm64-elf-hwcap3-v2-1-799d1daad8b0@kernel.org (mailing list archive)
State New
Headers show
Series arm64: Add infrastructure for use of AT_HWCAP3 | expand

Commit Message

Mark Brown Oct. 4, 2024, 8:26 p.m. UTC 
AT_HWCAP3 and AT_HWCAP4 were recently defined for use on PowerPC in commit
3281366a8e79 ("uapi/auxvec: Define AT_HWCAP3 and AT_HWCAP4 aux vector,
entries"). Since we want to start using AT_HWCAP3 on arm64 add support for
exposing both these new hwcaps via binfmt_elf.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
 fs/binfmt_elf.c        |  6 ++++++
 fs/binfmt_elf_fdpic.c  |  6 ++++++
 fs/compat_binfmt_elf.c | 10 ++++++++++
 3 files changed, 22 insertions(+)

Comments

Kees Cook Oct. 5, 2024, 12:22 a.m. UTC | #1 
On Fri, Oct 04, 2024 at 09:26:29PM +0100, Mark Brown wrote:
> AT_HWCAP3 and AT_HWCAP4 were recently defined for use on PowerPC in commit
> 3281366a8e79 ("uapi/auxvec: Define AT_HWCAP3 and AT_HWCAP4 aux vector,
> entries"). Since we want to start using AT_HWCAP3 on arm64 add support for

(Side note: I wonder what auxvec 29 and 30 used to be?)

> exposing both these new hwcaps via binfmt_elf.

This seems fine to me, feel free to carry this via the arm64 tree.

Acked-by: Kees Cook <kees@kernel.org>
Anshuman Khandual Oct. 8, 2024, 7:03 a.m. UTC | #2 
On 10/5/24 01:56, Mark Brown wrote:
> AT_HWCAP3 and AT_HWCAP4 were recently defined for use on PowerPC in commit
> 3281366a8e79 ("uapi/auxvec: Define AT_HWCAP3 and AT_HWCAP4 aux vector,
> entries"). Since we want to start using AT_HWCAP3 on arm64 add support for
> exposing both these new hwcaps via binfmt_elf.
> 
> Signed-off-by: Mark Brown <broonie@kernel.org>
> ---
>  fs/binfmt_elf.c        |  6 ++++++
>  fs/binfmt_elf_fdpic.c  |  6 ++++++
>  fs/compat_binfmt_elf.c | 10 ++++++++++
>  3 files changed, 22 insertions(+)
> 
> diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
> index 06dc4a57ba78a7939bbde96bf181eefa950ea13a..3039a6b7aba4bd38f26e21b626b579cc03f3a03e 100644
> --- a/fs/binfmt_elf.c
> +++ b/fs/binfmt_elf.c
> @@ -257,6 +257,12 @@ create_elf_tables(struct linux_binprm *bprm, const struct elfhdr *exec,
>  	NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes);
>  #ifdef ELF_HWCAP2
>  	NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2);
> +#endif
> +#ifdef ELF_HWCAP3
> +	NEW_AUX_ENT(AT_HWCAP3, ELF_HWCAP3);
> +#endif
> +#ifdef ELF_HWCAP4
> +	NEW_AUX_ENT(AT_HWCAP4, ELF_HWCAP4);
>  #endif
>  	NEW_AUX_ENT(AT_EXECFN, bprm->exec);
>  	if (k_platform) {
> diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
> index 4fe5bb9f1b1f5e0be6e8d1ef5b20492935b90633..31d253bd3961a8679678c600f4346bba23502598 100644
> --- a/fs/binfmt_elf_fdpic.c
> +++ b/fs/binfmt_elf_fdpic.c
> @@ -623,6 +623,12 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
>  	NEW_AUX_ENT(AT_HWCAP,	ELF_HWCAP);
>  #ifdef ELF_HWCAP2
>  	NEW_AUX_ENT(AT_HWCAP2,	ELF_HWCAP2);
> +#endif
> +#ifdef ELF_HWCAP3
> +	NEW_AUX_ENT(AT_HWCAP3,	ELF_HWCAP3);
> +#endif
> +#ifdef ELF_HWCAP4
> +	NEW_AUX_ENT(AT_HWCAP4,	ELF_HWCAP4);
>  #endif
>  	NEW_AUX_ENT(AT_PAGESZ,	PAGE_SIZE);
>  	NEW_AUX_ENT(AT_CLKTCK,	CLOCKS_PER_SEC);
> diff --git a/fs/compat_binfmt_elf.c b/fs/compat_binfmt_elf.c
> index 8f0af4f626316ed2e92204ff9bf381cd14103ae9..d5ef5469e4e620f6ee97f40ce9cbbfa48e37e33c 100644
> --- a/fs/compat_binfmt_elf.c
> +++ b/fs/compat_binfmt_elf.c
> @@ -80,6 +80,16 @@
>  #define	ELF_HWCAP2		COMPAT_ELF_HWCAP2
>  #endif
>  
> +#ifdef	COMPAT_ELF_HWCAP3
> +#undef	ELF_HWCAP3
> +#define	ELF_HWCAP3		COMPAT_ELF_HWCAP3
> +#endif
> +
> +#ifdef	COMPAT_ELF_HWCAP4
> +#undef	ELF_HWCAP4
> +#define	ELF_HWCAP4		COMPAT_ELF_HWCAP4
> +#endif
> +
>  #ifdef	COMPAT_ARCH_DLINFO
>  #undef	ARCH_DLINFO
>  #define	ARCH_DLINFO		COMPAT_ARCH_DLINFO
> 

Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
diff mbox series

Patch

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 06dc4a57ba78a7939bbde96bf181eefa950ea13a..3039a6b7aba4bd38f26e21b626b579cc03f3a03e 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -257,6 +257,12 @@  create_elf_tables(struct linux_binprm *bprm, const struct elfhdr *exec,
 	NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes);
 #ifdef ELF_HWCAP2
 	NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2);
+#endif
+#ifdef ELF_HWCAP3
+	NEW_AUX_ENT(AT_HWCAP3, ELF_HWCAP3);
+#endif
+#ifdef ELF_HWCAP4
+	NEW_AUX_ENT(AT_HWCAP4, ELF_HWCAP4);
 #endif
 	NEW_AUX_ENT(AT_EXECFN, bprm->exec);
 	if (k_platform) {
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 4fe5bb9f1b1f5e0be6e8d1ef5b20492935b90633..31d253bd3961a8679678c600f4346bba23502598 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -623,6 +623,12 @@  static int create_elf_fdpic_tables(struct linux_binprm *bprm,
 	NEW_AUX_ENT(AT_HWCAP,	ELF_HWCAP);
 #ifdef ELF_HWCAP2
 	NEW_AUX_ENT(AT_HWCAP2,	ELF_HWCAP2);
+#endif
+#ifdef ELF_HWCAP3
+	NEW_AUX_ENT(AT_HWCAP3,	ELF_HWCAP3);
+#endif
+#ifdef ELF_HWCAP4
+	NEW_AUX_ENT(AT_HWCAP4,	ELF_HWCAP4);
 #endif
 	NEW_AUX_ENT(AT_PAGESZ,	PAGE_SIZE);
 	NEW_AUX_ENT(AT_CLKTCK,	CLOCKS_PER_SEC);
diff --git a/fs/compat_binfmt_elf.c b/fs/compat_binfmt_elf.c
index 8f0af4f626316ed2e92204ff9bf381cd14103ae9..d5ef5469e4e620f6ee97f40ce9cbbfa48e37e33c 100644
--- a/fs/compat_binfmt_elf.c
+++ b/fs/compat_binfmt_elf.c
@@ -80,6 +80,16 @@ 
 #define	ELF_HWCAP2		COMPAT_ELF_HWCAP2
 #endif
 
+#ifdef	COMPAT_ELF_HWCAP3
+#undef	ELF_HWCAP3
+#define	ELF_HWCAP3		COMPAT_ELF_HWCAP3
+#endif
+
+#ifdef	COMPAT_ELF_HWCAP4
+#undef	ELF_HWCAP4
+#define	ELF_HWCAP4		COMPAT_ELF_HWCAP4
+#endif
+
 #ifdef	COMPAT_ARCH_DLINFO
 #undef	ARCH_DLINFO
 #define	ARCH_DLINFO		COMPAT_ARCH_DLINFO