linux-kernel - [PATCH 01/10] um: Split out default elf_aux

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Message-Id: <20251028-uml-remove-32bit-pseudo-vdso-v1-1-e930063eff5f@weissschuh.net>
Date: Tue, 28 Oct 2025 10:15:36 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Richard Weinberger <richard@....at>, 
 Anton Ivanov <anton.ivanov@...bridgegreys.com>, 
 Johannes Berg <johannes@...solutions.net>, 
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, 
 x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, 
 Kees Cook <kees@...nel.org>
Cc: linux-um@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 linux-mm@...ck.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 01/10] um: Split out default elf_aux_platform

Setting all auxiliary vector values to default values if one of them
was not provided by the host will discard perfectly fine values.

Move the elf_aux_platform fallback to its own conditional.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 arch/um/os-Linux/elf_aux.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/um/os-Linux/elf_aux.c b/arch/um/os-Linux/elf_aux.c
index 0a0f91cf4d6d..a62fe39e85c9 100644
--- a/arch/um/os-Linux/elf_aux.c
+++ b/arch/um/os-Linux/elf_aux.c
@@ -62,14 +62,16 @@ __init void scan_elf_aux( char **envp)
 		}
 	}
 	if ( ! __kernel_vsyscall || ! vsyscall_ehdr ||
-	     ! elf_aux_hwcap || ! elf_aux_platform ||
+	     ! elf_aux_hwcap ||
 	     ! page_size || (vsyscall_ehdr % page_size) ) {
 		__kernel_vsyscall = 0;
 		vsyscall_ehdr = 0;
 		elf_aux_hwcap = 0;
-		elf_aux_platform = "i586";
 	}
 	else {
 		vsyscall_end = vsyscall_ehdr + page_size;
 	}
+
+	if (!elf_aux_platform)
+		elf_aux_platform = "i586";
 }

-- 
2.51.1.dirty