[PATCH v2 00/15] exec: Remove AT_VECTOR_SIZE_ARCH from UAPI

[PATCH v2 00/15] exec: Remove AT_VECTOR_SIZE_ARCH from UAPI

[Thomas Weißschuh]

There is nothing userspace can do with this value. In the kernel is
always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
userspace and also changes from time to time.

Move the symbol to kernel-internal headers.

Meant to be applied through the asm-generic or execve tree.
The default recipient list was huge. I trimmed it to only the
architecture lists.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
Changes in v2:
- Rebase on v7.3-rc1.
- Pick up tags.
- Link to v1: https://lore.kernel.org/r/20260302-at-vector-size-arch-v1-0-a11f03ba2ca8@linutronix.de

---
Thomas Weißschuh (15):
      MAINTAINERS: exec: Add more auxvec.h variants
      auxvec.h: Move AT_VECTOR_SIZE definitions to linux/auxvec.h
      asm-generic: add an in-kernel auxvec.h header
      ARM: drop custom asm/auxvec.h
      x86: Remove AT_VECTOR_SIZE_ARCH from UAPI
      arm64: Remove AT_VECTOR_SIZE_ARCH from UAPI
      RISC-V: Remove AT_VECTOR_SIZE_ARCH from UAPI
      LoongArch: Remove AT_VECTOR_SIZE_ARCH from UAPI
      s390: Remove AT_VECTOR_SIZE_ARCH from UAPI
      powerpc: Remove AT_VECTOR_SIZE_ARCH from UAPI
      MIPS: Remove AT_VECTOR_SIZE_ARCH from UAPI
      sparc: Remove AT_VECTOR_SIZE_ARCH from UAPI
      sh: Remove AT_VECTOR_SIZE_ARCH from UAPI
      alpha: remove AT_VECTOR_SIZE_ARCH from UAPI
      auxvec.h: Drop fallback AT_VECTOR_SIZE_ARCH

 MAINTAINERS                              |  5 +++++
 arch/alpha/include/asm/auxvec.h          |  7 +++++++
 arch/alpha/include/uapi/asm/auxvec.h     |  8 +++-----
 arch/arm/include/asm/auxvec.h            |  1 -
 arch/arm64/include/asm/auxvec.h          |  7 +++++++
 arch/arm64/include/uapi/asm/auxvec.h     |  6 ++----
 arch/loongarch/include/asm/auxvec.h      | 14 ++++++++++++++
 arch/loongarch/include/uapi/asm/auxvec.h |  8 +++-----
 arch/mips/include/asm/auxvec.h           | 17 +++++++++++++++++
 arch/mips/include/uapi/asm/auxvec.h      |  8 +++-----
 arch/powerpc/include/asm/auxvec.h        |  7 +++++++
 arch/powerpc/include/uapi/asm/auxvec.h   |  6 ++----
 arch/riscv/include/asm/auxvec.h          | 13 +++++++++++++
 arch/riscv/include/uapi/asm/auxvec.h     |  2 --
 arch/s390/include/asm/auxvec.h           |  7 +++++++
 arch/s390/include/uapi/asm/auxvec.h      |  6 ++----
 arch/sh/include/asm/auxvec.h             |  7 +++++++
 arch/sh/include/uapi/asm/auxvec.h        |  8 +++-----
 arch/sparc/include/asm/auxvec.h          |  6 ++++++
 arch/sparc/include/uapi/asm/auxvec.h     |  8 +++-----
 arch/x86/include/asm/auxvec.h            | 12 ++++++++++++
 arch/x86/include/uapi/asm/auxvec.h       | 13 +++----------
 include/asm-generic/Kbuild               |  1 +
 include/asm-generic/auxvec.h             |  7 +++++++
 include/linux/auxvec.h                   |  5 +++++
 include/linux/mm_types.h                 |  6 ------
 26 files changed, 139 insertions(+), 56 deletions(-)
---
base-commit: 2698961599195990117a0fa240118ecf2f8e7453
change-id: 20260109-at-vector-size-arch-6e0f2e9ff8b6

Best regards,
--  
Thomas Weißschuh <thomas.weissschuh@linutronix.de>

[PATCH v2 01/15] MAINTAINERS: exec: Add more auxvec.h variants

[Thomas Weißschuh]

There are quite a few auxvec.h headers. Mark all of them maintained
as part of 'EXEC & BINFMT API, ELF'.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Kees Cook <kees@kernel.org>
---
 MAINTAINERS | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 3a19da74d00c..42715aea210b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9808,13 +9808,16 @@ L:	linux-mm@kvack.org
 S:	Supported
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/execve
 F:	Documentation/userspace-api/ELF.rst
+F:	arch/*/include/uapi/asm/auxvec.h
 F:	fs/*binfmt_*.c
 F:	fs/Kconfig.binfmt
 F:	fs/exec.c
 F:	fs/tests/binfmt_*_kunit.c
 F:	fs/tests/exec_kunit.c
+F:	include/linux/auxvec.h
 F:	include/linux/binfmts.h
 F:	include/linux/elf.h
+F:	include/uapi/asm-generic/auxvec.h
 F:	include/uapi/linux/auxvec.h
 F:	include/uapi/linux/binfmts.h
 F:	include/uapi/linux/elf.h

-- 
2.55.0

[PATCH v2 02/15] auxvec.h: Move AT_VECTOR_SIZE definitions to linux/auxvec.h

[Thomas Weißschuh]

The auxvec.h header is a more fitting place for these definitions.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Kees Cook <kees@kernel.org>
---
 include/linux/auxvec.h   | 7 +++++++
 include/linux/mm_types.h | 6 ------
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/include/linux/auxvec.h b/include/linux/auxvec.h
index 8bcb9b726262..4b364e639f08 100644
--- a/include/linux/auxvec.h
+++ b/include/linux/auxvec.h
@@ -6,4 +6,11 @@
 
 #define AT_VECTOR_SIZE_BASE 24 /* NEW_AUX_ENT entries in auxiliary table */
   /* number of "#define AT_.*" above, minus {AT_NULL, AT_IGNORE, AT_NOTELF} */
+
+#ifndef AT_VECTOR_SIZE_ARCH
+#define AT_VECTOR_SIZE_ARCH 0
+#endif
+
+#define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1))
+
 #endif /* _LINUX_AUXVEC_H */
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 6d815f6440c9..08a06b26375b 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -26,12 +26,6 @@
 
 #include <asm/mmu.h>
 
-#ifndef AT_VECTOR_SIZE_ARCH
-#define AT_VECTOR_SIZE_ARCH 0
-#endif
-#define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1))
-
-
 struct address_space;
 struct futex_private_hash;
 struct mem_cgroup;

-- 
2.55.0

[PATCH v2 03/15] asm-generic: add an in-kernel auxvec.h header

[Thomas Weißschuh]

Upcoming changes will create architecture-specific asm/auxvec.h headers.
Add asm-generic infrastructure to handle the fallbacks for architectures
which are not migrated yet and those which won't require their own
definition.

Extend the list of includes in linux/auxvec.h to cover all potential
low-level auxvec.h headers.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Kees Cook <kees@kernel.org>
---
 MAINTAINERS                  | 2 ++
 include/asm-generic/Kbuild   | 1 +
 include/asm-generic/auxvec.h | 7 +++++++
 include/linux/auxvec.h       | 2 ++
 4 files changed, 12 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 42715aea210b..6974f8dad1e9 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9808,12 +9808,14 @@ L:	linux-mm@kvack.org
 S:	Supported
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/execve
 F:	Documentation/userspace-api/ELF.rst
+F:	arch/*/include/asm/auxvec.h
 F:	arch/*/include/uapi/asm/auxvec.h
 F:	fs/*binfmt_*.c
 F:	fs/Kconfig.binfmt
 F:	fs/exec.c
 F:	fs/tests/binfmt_*_kunit.c
 F:	fs/tests/exec_kunit.c
+F:	include/asm-generic/auxvec.h
 F:	include/linux/auxvec.h
 F:	include/linux/binfmts.h
 F:	include/linux/elf.h
diff --git a/include/asm-generic/Kbuild b/include/asm-generic/Kbuild
index 2bc00c67dc54..90626358f94b 100644
--- a/include/asm-generic/Kbuild
+++ b/include/asm-generic/Kbuild
@@ -6,6 +6,7 @@
 
 mandatory-y += atomic.h
 mandatory-y += archrandom.h
+mandatory-y += auxvec.h
 mandatory-y += barrier.h
 mandatory-y += bitops.h
 mandatory-y += bug.h
diff --git a/include/asm-generic/auxvec.h b/include/asm-generic/auxvec.h
new file mode 100644
index 000000000000..e4abd2a8c5ed
--- /dev/null
+++ b/include/asm-generic/auxvec.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_GENERIC_AUXVAL_H__
+#define __ASM_GENERIC_AUXVAL_H__
+
+#define AT_VECTOR_SIZE_ARCH 0
+
+#endif
diff --git a/include/linux/auxvec.h b/include/linux/auxvec.h
index 4b364e639f08..de1c33c4a256 100644
--- a/include/linux/auxvec.h
+++ b/include/linux/auxvec.h
@@ -2,7 +2,9 @@
 #ifndef _LINUX_AUXVEC_H
 #define _LINUX_AUXVEC_H
 
+#include <uapi/asm/auxvec.h>
 #include <uapi/linux/auxvec.h>
+#include <asm/auxvec.h>
 
 #define AT_VECTOR_SIZE_BASE 24 /* NEW_AUX_ENT entries in auxiliary table */
   /* number of "#define AT_.*" above, minus {AT_NULL, AT_IGNORE, AT_NOTELF} */

-- 
2.55.0

[PATCH v2 04/15] ARM: drop custom asm/auxvec.h

[Thomas Weißschuh]

With the introduction of asm-generic/auxvec.h, this header unnecessary.

Drop it.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Kees Cook <kees@kernel.org>
---
 arch/arm/include/asm/auxvec.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm/include/asm/auxvec.h b/arch/arm/include/asm/auxvec.h
deleted file mode 100644
index fbd388c46299..000000000000
--- a/arch/arm/include/asm/auxvec.h
+++ /dev/null
@@ -1 +0,0 @@
-#include <uapi/asm/auxvec.h>

-- 
2.55.0

[PATCH v2 05/15] x86: Remove AT_VECTOR_SIZE_ARCH from UAPI

[Thomas Weißschuh]

There is nothing userspace can do with this value. In the kernel is
always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
userspace and also changes from time to time.

Move the symbol to a kernel-internal header.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Kees Cook <kees@kernel.org>
---
 arch/x86/include/asm/auxvec.h      | 12 ++++++++++++
 arch/x86/include/uapi/asm/auxvec.h | 13 +++----------
 2 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/arch/x86/include/asm/auxvec.h b/arch/x86/include/asm/auxvec.h
new file mode 100644
index 000000000000..ed26ad09f3e3
--- /dev/null
+++ b/arch/x86/include/asm/auxvec.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_AUXVEC_H
+#define _ASM_X86_AUXVEC_H
+
+/* entries in ARCH_DLINFO: */
+#if defined(CONFIG_IA32_EMULATION) || !defined(CONFIG_X86_64)
+# define AT_VECTOR_SIZE_ARCH 3
+#else /* else it's non-compat x86-64 */
+# define AT_VECTOR_SIZE_ARCH 2
+#endif
+
+#endif /* _ASM_X86_AUXVEC_H */
diff --git a/arch/x86/include/uapi/asm/auxvec.h b/arch/x86/include/uapi/asm/auxvec.h
index bdde9e18f94e..6677c9ace117 100644
--- a/arch/x86/include/uapi/asm/auxvec.h
+++ b/arch/x86/include/uapi/asm/auxvec.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#ifndef _ASM_X86_AUXVEC_H
-#define _ASM_X86_AUXVEC_H
+#ifndef _UAPI_ASM_X86_AUXVEC_H
+#define _UAPI_ASM_X86_AUXVEC_H
 /*
  * Architecture-neutral AT_ values in 0-17, leave some room
  * for more of them, start the x86-specific ones at 32.
@@ -10,11 +10,4 @@
 #endif
 #define AT_SYSINFO_EHDR		33
 
-/* entries in ARCH_DLINFO: */
-#if defined(__KERNEL__) && (defined(CONFIG_IA32_EMULATION) || !defined(CONFIG_X86_64))
-# define AT_VECTOR_SIZE_ARCH 3
-#else /* else it's non-compat x86-64 */
-# define AT_VECTOR_SIZE_ARCH 2
-#endif
-
-#endif /* _ASM_X86_AUXVEC_H */
+#endif /* _UAPI_ASM_X86_AUXVEC_H */

-- 
2.55.0

[PATCH v2 06/15] arm64: Remove AT_VECTOR_SIZE_ARCH from UAPI

[Thomas Weißschuh]

There is nothing userspace can do with this value. In the kernel is
always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
userspace and also changes from time to time.

Move the symbol to a kernel-internal header.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Kees Cook <kees@kernel.org>
---
 arch/arm64/include/asm/auxvec.h      | 7 +++++++
 arch/arm64/include/uapi/asm/auxvec.h | 6 ++----
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/include/asm/auxvec.h b/arch/arm64/include/asm/auxvec.h
new file mode 100644
index 000000000000..de24eaaa06e2
--- /dev/null
+++ b/arch/arm64/include/asm/auxvec.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_AUXVEC_H
+#define __ASM_AUXVEC_H
+
+#define AT_VECTOR_SIZE_ARCH 2 /* entries in ARCH_DLINFO */
+
+#endif
diff --git a/arch/arm64/include/uapi/asm/auxvec.h b/arch/arm64/include/uapi/asm/auxvec.h
index 743c0b84fd30..fb51e906813a 100644
--- a/arch/arm64/include/uapi/asm/auxvec.h
+++ b/arch/arm64/include/uapi/asm/auxvec.h
@@ -14,13 +14,11 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-#ifndef __ASM_AUXVEC_H
-#define __ASM_AUXVEC_H
+#ifndef __UAPI_ASM_AUXVEC_H
+#define __UAPI_ASM_AUXVEC_H
 
 /* vDSO location */
 #define AT_SYSINFO_EHDR	33
 #define AT_MINSIGSTKSZ	51	/* stack needed for signal delivery */
 
-#define AT_VECTOR_SIZE_ARCH 2 /* entries in ARCH_DLINFO */
-
 #endif

-- 
2.55.0

[PATCH v2 07/15] RISC-V: Remove AT_VECTOR_SIZE_ARCH from UAPI

[Thomas Weißschuh]

There is nothing userspace can do with this value. In the kernel is
always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
userspace and also changes from time to time.

Move the symbol to a kernel-internal header.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Paul Walmsley <pjw@kernel.org> # arch/riscv
Reviewed-by: Andy Chiu <andybnac@gmail.com>
Reviewed-by: Kees Cook <kees@kernel.org>
---
 arch/riscv/include/asm/auxvec.h      | 13 +++++++++++++
 arch/riscv/include/uapi/asm/auxvec.h |  2 --
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/include/asm/auxvec.h b/arch/riscv/include/asm/auxvec.h
new file mode 100644
index 000000000000..fb4233445276
--- /dev/null
+++ b/arch/riscv/include/asm/auxvec.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ * Copyright (C) 2015 Regents of the University of California
+ */
+
+#ifndef _ASM_RISCV_AUXVEC_H
+#define _ASM_RISCV_AUXVEC_H
+
+/* entries in ARCH_DLINFO */
+#define AT_VECTOR_SIZE_ARCH	10
+
+#endif /* _UAPI_ASM_RISCV_AUXVEC_H */
diff --git a/arch/riscv/include/uapi/asm/auxvec.h b/arch/riscv/include/uapi/asm/auxvec.h
index 95050ebe9ad0..0a725f2aa2e7 100644
--- a/arch/riscv/include/uapi/asm/auxvec.h
+++ b/arch/riscv/include/uapi/asm/auxvec.h
@@ -33,8 +33,6 @@
 #define AT_L3_CACHESIZE		46
 #define AT_L3_CACHEGEOMETRY	47
 
-/* entries in ARCH_DLINFO */
-#define AT_VECTOR_SIZE_ARCH	10
 #define AT_MINSIGSTKSZ		51
 
 #endif /* _UAPI_ASM_RISCV_AUXVEC_H */

-- 
2.55.0

[PATCH v2 08/15] LoongArch: Remove AT_VECTOR_SIZE_ARCH from UAPI

[Thomas Weißschuh]

There is nothing userspace can do with this value. In the kernel is
always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
userspace and also changes from time to time.

Move the symbol to a kernel-internal header.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Kees Cook <kees@kernel.org>
---
 arch/loongarch/include/asm/auxvec.h      | 14 ++++++++++++++
 arch/loongarch/include/uapi/asm/auxvec.h |  8 +++-----
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/arch/loongarch/include/asm/auxvec.h b/arch/loongarch/include/asm/auxvec.h
new file mode 100644
index 000000000000..37dd717a3a22
--- /dev/null
+++ b/arch/loongarch/include/asm/auxvec.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Author: Hanlu Li <lihanlu@loongson.cn>
+ *         Huacai Chen <chenhuacai@loongson.cn>
+ *
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+
+#ifndef __ASM_AUXVEC_H
+#define __ASM_AUXVEC_H
+
+#define AT_VECTOR_SIZE_ARCH 1 /* entries in ARCH_DLINFO */
+
+#endif /* __ASM_AUXVEC_H */
diff --git a/arch/loongarch/include/uapi/asm/auxvec.h b/arch/loongarch/include/uapi/asm/auxvec.h
index 922d9e6b5058..79691c422c7e 100644
--- a/arch/loongarch/include/uapi/asm/auxvec.h
+++ b/arch/loongarch/include/uapi/asm/auxvec.h
@@ -6,12 +6,10 @@
  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
  */
 
-#ifndef __ASM_AUXVEC_H
-#define __ASM_AUXVEC_H
+#ifndef __UAPI_ASM_AUXVEC_H
+#define __UAPI_ASM_AUXVEC_H
 
 /* Location of VDSO image. */
 #define AT_SYSINFO_EHDR		33
 
-#define AT_VECTOR_SIZE_ARCH 1 /* entries in ARCH_DLINFO */
-
-#endif /* __ASM_AUXVEC_H */
+#endif /* __UAPI_ASM_AUXVEC_H */

-- 
2.55.0

[PATCH v2 09/15] s390: Remove AT_VECTOR_SIZE_ARCH from UAPI

[Thomas Weißschuh]

There is nothing userspace can do with this value. In the kernel is
always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
userspace and also changes from time to time.

Move the symbol to a kernel-internal header.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Kees Cook <kees@kernel.org>
---
 arch/s390/include/asm/auxvec.h      | 7 +++++++
 arch/s390/include/uapi/asm/auxvec.h | 6 ++----
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/s390/include/asm/auxvec.h b/arch/s390/include/asm/auxvec.h
new file mode 100644
index 000000000000..beaaefe12a84
--- /dev/null
+++ b/arch/s390/include/asm/auxvec.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef __ASMS390_AUXVEC_H
+#define __ASMS390_AUXVEC_H
+
+#define AT_VECTOR_SIZE_ARCH 1 /* entries in ARCH_DLINFO */
+
+#endif
diff --git a/arch/s390/include/uapi/asm/auxvec.h b/arch/s390/include/uapi/asm/auxvec.h
index a056c4637ffc..54bbfd68d709 100644
--- a/arch/s390/include/uapi/asm/auxvec.h
+++ b/arch/s390/include/uapi/asm/auxvec.h
@@ -1,9 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#ifndef __ASMS390_AUXVEC_H
-#define __ASMS390_AUXVEC_H
+#ifndef __ASMS390_UAPI_AUXVEC_H
+#define __ASMS390_UAPI_AUXVEC_H
 
 #define AT_SYSINFO_EHDR		33
 
-#define AT_VECTOR_SIZE_ARCH 1 /* entries in ARCH_DLINFO */
-
 #endif

-- 
2.55.0

[PATCH v2 10/15] powerpc: Remove AT_VECTOR_SIZE_ARCH from UAPI

[Thomas Weißschuh]

There is nothing userspace can do with this value. In the kernel is
always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
userspace and also changes from time to time.

Move the symbol to a kernel-internal header.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Kees Cook <kees@kernel.org>
---
 arch/powerpc/include/asm/auxvec.h      | 7 +++++++
 arch/powerpc/include/uapi/asm/auxvec.h | 6 ++----
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/include/asm/auxvec.h b/arch/powerpc/include/asm/auxvec.h
new file mode 100644
index 000000000000..d6c180e9ac2c
--- /dev/null
+++ b/arch/powerpc/include/asm/auxvec.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_AUXVEC_H
+#define _ASM_POWERPC_AUXVEC_H
+
+#define AT_VECTOR_SIZE_ARCH	15 /* entries in ARCH_DLINFO */
+
+#endif
diff --git a/arch/powerpc/include/uapi/asm/auxvec.h b/arch/powerpc/include/uapi/asm/auxvec.h
index aa7c16215453..9ab5b6d17929 100644
--- a/arch/powerpc/include/uapi/asm/auxvec.h
+++ b/arch/powerpc/include/uapi/asm/auxvec.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#ifndef _ASM_POWERPC_AUXVEC_H
-#define _ASM_POWERPC_AUXVEC_H
+#ifndef _UAPI_ASM_POWERPC_AUXVEC_H
+#define _UAPI_ASM_POWERPC_AUXVEC_H
 
 /*
  * We need to put in some extra aux table entries to tell glibc what
@@ -50,6 +50,4 @@
 
 #define AT_MINSIGSTKSZ		51      /* stack needed for signal delivery */
 
-#define AT_VECTOR_SIZE_ARCH	15 /* entries in ARCH_DLINFO */
-
 #endif

-- 
2.55.0

[PATCH v2 11/15] MIPS: Remove AT_VECTOR_SIZE_ARCH from UAPI

[Thomas Weißschuh]

There is nothing userspace can do with this value. In the kernel is
always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
userspace and also changes from time to time.

Move the symbol to a kernel-internal header.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Kees Cook <kees@kernel.org>
---
 arch/mips/include/asm/auxvec.h      | 17 +++++++++++++++++
 arch/mips/include/uapi/asm/auxvec.h |  8 +++-----
 2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/arch/mips/include/asm/auxvec.h b/arch/mips/include/asm/auxvec.h
new file mode 100644
index 000000000000..76c445e7890f
--- /dev/null
+++ b/arch/mips/include/asm/auxvec.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2015 Imagination Technologies
+ * Author: Alex Smith <alex.smith@imgtec.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#ifndef __ASM_AUXVEC_H
+#define __ASM_AUXVEC_H
+
+#define AT_VECTOR_SIZE_ARCH 1 /* entries in ARCH_DLINFO */
+
+#endif /* __ASM_AUXVEC_H */
diff --git a/arch/mips/include/uapi/asm/auxvec.h b/arch/mips/include/uapi/asm/auxvec.h
index 612c2c41f60b..1331ac4d935e 100644
--- a/arch/mips/include/uapi/asm/auxvec.h
+++ b/arch/mips/include/uapi/asm/auxvec.h
@@ -9,12 +9,10 @@
  * option) any later version.
  */
 
-#ifndef __ASM_AUXVEC_H
-#define __ASM_AUXVEC_H
+#ifndef __UAPI_ASM_AUXVEC_H
+#define __UAPI_ASM_AUXVEC_H
 
 /* Location of VDSO image. */
 #define AT_SYSINFO_EHDR		33
 
-#define AT_VECTOR_SIZE_ARCH 1 /* entries in ARCH_DLINFO */
-
-#endif /* __ASM_AUXVEC_H */
+#endif /* __UAPI_ASM_AUXVEC_H */

-- 
2.55.0

[PATCH v2 12/15] sparc: Remove AT_VECTOR_SIZE_ARCH from UAPI

[Thomas Weißschuh]

There is nothing userspace can do with this value. In the kernel is
always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
userspace and also changes from time to time.

Move the symbol to a kernel-internal header.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Kees Cook <kees@kernel.org>
---
 arch/sparc/include/asm/auxvec.h      | 6 ++++++
 arch/sparc/include/uapi/asm/auxvec.h | 8 +++-----
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/arch/sparc/include/asm/auxvec.h b/arch/sparc/include/asm/auxvec.h
new file mode 100644
index 000000000000..50c249a8bd17
--- /dev/null
+++ b/arch/sparc/include/asm/auxvec.h
@@ -0,0 +1,6 @@
+#ifndef __ASMSPARC_AUXVEC_H
+#define __ASMSPARC_AUXVEC_H
+
+#define AT_VECTOR_SIZE_ARCH	4
+
+#endif /* !(__ASMSPARC_AUXVEC_H) */
diff --git a/arch/sparc/include/uapi/asm/auxvec.h b/arch/sparc/include/uapi/asm/auxvec.h
index ab8780fb9df1..0fab3b29148a 100644
--- a/arch/sparc/include/uapi/asm/auxvec.h
+++ b/arch/sparc/include/uapi/asm/auxvec.h
@@ -1,5 +1,5 @@
-#ifndef __ASMSPARC_AUXVEC_H
-#define __ASMSPARC_AUXVEC_H
+#ifndef __UAPI_ASMSPARC_AUXVEC_H
+#define __UAPI_ASMSPARC_AUXVEC_H
 
 #define AT_SYSINFO_EHDR		33
 
@@ -10,6 +10,4 @@
 #define AT_ADI_NBITS	49
 #define AT_ADI_UEONADI	50
 
-#define AT_VECTOR_SIZE_ARCH	4
-
-#endif /* !(__ASMSPARC_AUXVEC_H) */
+#endif /* !(__UAPI_ASMSPARC_AUXVEC_H) */

-- 
2.55.0

[PATCH v2 13/15] sh: Remove AT_VECTOR_SIZE_ARCH from UAPI

[Thomas Weißschuh]

There is nothing userspace can do with this value. In the kernel is
always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
userspace and also changes from time to time.

Move the symbol to a kernel-internal header.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Kees Cook <kees@kernel.org>
---
 arch/sh/include/asm/auxvec.h      | 7 +++++++
 arch/sh/include/uapi/asm/auxvec.h | 8 +++-----
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/arch/sh/include/asm/auxvec.h b/arch/sh/include/asm/auxvec.h
new file mode 100644
index 000000000000..f0830808eb19
--- /dev/null
+++ b/arch/sh/include/asm/auxvec.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_SH_AUXVEC_H
+#define __ASM_SH_AUXVEC_H
+
+#define AT_VECTOR_SIZE_ARCH 5 /* entries in ARCH_DLINFO */
+
+#endif /* __ASM_SH_AUXVEC_H */
diff --git a/arch/sh/include/uapi/asm/auxvec.h b/arch/sh/include/uapi/asm/auxvec.h
index 63fcc39e2c6a..cf0f13da977a 100644
--- a/arch/sh/include/uapi/asm/auxvec.h
+++ b/arch/sh/include/uapi/asm/auxvec.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#ifndef __ASM_SH_AUXVEC_H
-#define __ASM_SH_AUXVEC_H
+#ifndef __UAPI_ASM_SH_AUXVEC_H
+#define __UAPI_ASM_SH_AUXVEC_H
 
 /*
  * Architecture-neutral AT_ values in 0-17, leave some room
@@ -30,6 +30,4 @@
 #define AT_L1D_CACHESHAPE	35
 #define AT_L2_CACHESHAPE	36
 
-#define AT_VECTOR_SIZE_ARCH 5 /* entries in ARCH_DLINFO */
-
-#endif /* __ASM_SH_AUXVEC_H */
+#endif /* __UAPI_ASM_SH_AUXVEC_H */

-- 
2.55.0

[PATCH v2 14/15] alpha: remove AT_VECTOR_SIZE_ARCH from UAPI

[Thomas Weißschuh]

There is nothing userspace can do with this value. In the kernel is
always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
userspace and also changes from time to time.

Move the symbol to a kernel-internal header.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Magnus Lindholm <linmag7@gmail.com>
Reviewed-by: Kees Cook <kees@kernel.org>
---
 arch/alpha/include/asm/auxvec.h      | 7 +++++++
 arch/alpha/include/uapi/asm/auxvec.h | 8 +++-----
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/arch/alpha/include/asm/auxvec.h b/arch/alpha/include/asm/auxvec.h
new file mode 100644
index 000000000000..fa90ee4f899c
--- /dev/null
+++ b/arch/alpha/include/asm/auxvec.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_ALPHA_AUXVEC_H
+#define __ASM_ALPHA_AUXVEC_H
+
+#define AT_VECTOR_SIZE_ARCH 4 /* entries in ARCH_DLINFO */
+
+#endif /* __ASM_ALPHA_AUXVEC_H */
diff --git a/arch/alpha/include/uapi/asm/auxvec.h b/arch/alpha/include/uapi/asm/auxvec.h
index 57cae8780d81..d21b87b6730a 100644
--- a/arch/alpha/include/uapi/asm/auxvec.h
+++ b/arch/alpha/include/uapi/asm/auxvec.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#ifndef __ASM_ALPHA_AUXVEC_H
-#define __ASM_ALPHA_AUXVEC_H
+#ifndef __UAPI_ASM_ALPHA_AUXVEC_H
+#define __UAPI_ASM_ALPHA_AUXVEC_H
 
 /* Reserve these numbers for any future use of a VDSO.  */
 #if 0
@@ -22,6 +22,4 @@
 #define AT_L2_CACHESHAPE	36
 #define AT_L3_CACHESHAPE	37
 
-#define AT_VECTOR_SIZE_ARCH 4 /* entries in ARCH_DLINFO */
-
-#endif /* __ASM_ALPHA_AUXVEC_H */
+#endif /* __UAPI_ASM_ALPHA_AUXVEC_H */

-- 
2.55.0

[PATCH v2 15/15] auxvec.h: Drop fallback AT_VECTOR_SIZE_ARCH

[Thomas Weißschuh]

All asm headers now define this constant.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Kees Cook <kees@kernel.org>
---
 include/linux/auxvec.h | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/include/linux/auxvec.h b/include/linux/auxvec.h
index de1c33c4a256..f7ddea1dbc8e 100644
--- a/include/linux/auxvec.h
+++ b/include/linux/auxvec.h
@@ -9,10 +9,6 @@
 #define AT_VECTOR_SIZE_BASE 24 /* NEW_AUX_ENT entries in auxiliary table */
   /* number of "#define AT_.*" above, minus {AT_NULL, AT_IGNORE, AT_NOTELF} */
 
-#ifndef AT_VECTOR_SIZE_ARCH
-#define AT_VECTOR_SIZE_ARCH 0
-#endif
-
 #define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1))
 
 #endif /* _LINUX_AUXVEC_H */

-- 
2.55.0

Re: [PATCH v2 03/15] asm-generic: add an in-kernel auxvec.h header

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Low] Incorrect include guard name in `include/asm-generic/auxvec.h`.
--

commit a6c0fee565d771a1d46c4c885fe6773f26339df1
Author: Thomas Weißschuh <thomas.weissschuh@linutronix.de>

asm-generic: add an in-kernel auxvec.h header

This commit adds asm-generic infrastructure to handle fallbacks for
architectures which are not migrated yet and those which won't require
their own definition of auxvec.h. It also extends linux/auxvec.h to
cover all potential low-level auxvec.h headers.

> diff --git a/include/asm-generic/auxvec.h b/include/asm-generic/auxvec.h
> new file mode 100644
> index 0000000000000..e4abd2a8c5ed3
> --- /dev/null
> +++ b/include/asm-generic/auxvec.h
> @@ -0,0 +1,7 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __ASM_GENERIC_AUXVAL_H__
> +#define __ASM_GENERIC_AUXVAL_H__

[Severity: Low]
This isn't a bug, but there appears to be a typo in the include guard. The
macro name __ASM_GENERIC_AUXVAL_H__ does not match the filename auxvec.h.
Should this be named __ASM_GENERIC_AUXVEC_H__ instead?

> +
> +#define AT_VECTOR_SIZE_ARCH 0
> +
> +#endif

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260903-at-vector-size-arch-v2-0-5bc32a71e3d8@linutronix.de?part=3

Re: [PATCH v2 02/15] auxvec.h: Move AT_VECTOR_SIZE definitions to linux/auxvec.h

[sashiko-bot]

> The auxvec.h header is a more fitting place for these definitions.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260903-at-vector-size-arch-v2-0-5bc32a71e3d8@linutronix.de?part=2

Re: [PATCH v2 04/15] ARM: drop custom asm/auxvec.h

[sashiko-bot]

> With the introduction of asm-generic/auxvec.h, this header unnecessary.
> 
> Drop it.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260903-at-vector-size-arch-v2-0-5bc32a71e3d8@linutronix.de?part=4

Re: [PATCH v2 05/15] x86: Remove AT_VECTOR_SIZE_ARCH from UAPI

[sashiko-bot]

> There is nothing userspace can do with this value. In the kernel is
> always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
> userspace and also changes from time to time.
> 
> Move the symbol to a kernel-internal header.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260903-at-vector-size-arch-v2-0-5bc32a71e3d8@linutronix.de?part=5

Re: [PATCH v2 08/15] LoongArch: Remove AT_VECTOR_SIZE_ARCH from UAPI

[sashiko-bot]

> There is nothing userspace can do with this value. In the kernel is
> always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
> userspace and also changes from time to time.
> 
> Move the symbol to a kernel-internal header.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260903-at-vector-size-arch-v2-0-5bc32a71e3d8@linutronix.de?part=8

Re: [PATCH v2 07/15] RISC-V: Remove AT_VECTOR_SIZE_ARCH from UAPI

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Low] Copy-paste error in header guard comment.
--

commit 720f0a96cf858b439bf53a700bc4833d17fac31f
Author: Thomas Weißschuh <thomas.weissschuh@linutronix.de>

RISC-V: Remove AT_VECTOR_SIZE_ARCH from UAPI

This commit removes AT_VECTOR_SIZE_ARCH from the RISC-V UAPI headers since 
it is not used by userspace. It moves the symbol to a newly created 
kernel-internal header instead.

> diff --git a/arch/riscv/include/asm/auxvec.h b/arch/riscv/include/asm/auxvec.h
> new file mode 100644
> index 0000000000000..fb4233445276a
> --- /dev/null
> +++ b/arch/riscv/include/asm/auxvec.h
> @@ -0,0 +1,13 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (C) 2012 ARM Ltd.
> + * Copyright (C) 2015 Regents of the University of California
> + */
> +
> +#ifndef _ASM_RISCV_AUXVEC_H
> +#define _ASM_RISCV_AUXVEC_H
> +
> +/* entries in ARCH_DLINFO */
> +#define AT_VECTOR_SIZE_ARCH	10
> +
> +#endif /* _UAPI_ASM_RISCV_AUXVEC_H */

[Severity: Low]
This isn't a bug, but should this #endif comment match the newly defined 
_ASM_RISCV_AUXVEC_H guard at the top of the file instead of referencing 
the old UAPI header guard?

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260903-at-vector-size-arch-v2-0-5bc32a71e3d8@linutronix.de?part=7

Re: [PATCH v2 09/15] s390: Remove AT_VECTOR_SIZE_ARCH from UAPI

[sashiko-bot]

> There is nothing userspace can do with this value. In the kernel is
> always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
> userspace and also changes from time to time.
> 
> Move the symbol to a kernel-internal header.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260903-at-vector-size-arch-v2-0-5bc32a71e3d8@linutronix.de?part=9

Re: [PATCH v2 11/15] MIPS: Remove AT_VECTOR_SIZE_ARCH from UAPI

[sashiko-bot]

> There is nothing userspace can do with this value. In the kernel is
> always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
> userspace and also changes from time to time.
> 
> Move the symbol to a kernel-internal header.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260903-at-vector-size-arch-v2-0-5bc32a71e3d8@linutronix.de?part=11

Re: [PATCH v2 10/15] powerpc: Remove AT_VECTOR_SIZE_ARCH from UAPI

[sashiko-bot]

> There is nothing userspace can do with this value. In the kernel is
> always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
> userspace and also changes from time to time.
> 
> Move the symbol to a kernel-internal header.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260903-at-vector-size-arch-v2-0-5bc32a71e3d8@linutronix.de?part=10

Re: [PATCH v2 12/15] sparc: Remove AT_VECTOR_SIZE_ARCH from UAPI

[sashiko-bot]

> There is nothing userspace can do with this value. In the kernel is
> always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
> userspace and also changes from time to time.
> 
> Move the symbol to a kernel-internal header.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260903-at-vector-size-arch-v2-0-5bc32a71e3d8@linutronix.de?part=12

Re: [PATCH v2 13/15] sh: Remove AT_VECTOR_SIZE_ARCH from UAPI

[sashiko-bot]

> There is nothing userspace can do with this value. In the kernel is
> always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
> userspace and also changes from time to time.
> 
> Move the symbol to a kernel-internal header.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260903-at-vector-size-arch-v2-0-5bc32a71e3d8@linutronix.de?part=13

Re: [PATCH v2 06/15] arm64: Remove AT_VECTOR_SIZE_ARCH from UAPI

[sashiko-bot]

> There is nothing userspace can do with this value. In the kernel is
> always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
> userspace and also changes from time to time.
> 
> Move the symbol to a kernel-internal header.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260903-at-vector-size-arch-v2-0-5bc32a71e3d8@linutronix.de?part=6

Re: [PATCH v2 14/15] alpha: remove AT_VECTOR_SIZE_ARCH from UAPI

[sashiko-bot]

> There is nothing userspace can do with this value. In the kernel is
> always combined with AT_VECTOR_SIZE_BASE, which is not exposed to
> userspace and also changes from time to time.
> 
> Move the symbol to a kernel-internal header.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260903-at-vector-size-arch-v2-0-5bc32a71e3d8@linutronix.de?part=14

Re: [PATCH v2 15/15] auxvec.h: Drop fallback AT_VECTOR_SIZE_ARCH

[sashiko-bot]

> All asm headers now define this constant.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260903-at-vector-size-arch-v2-0-5bc32a71e3d8@linutronix.de?part=15