linux-kernel - [PATCH 2/4] arm64/process: Make loading of 32bit processes depend on aarch32

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Message-ID: <a40565807874c9ca82d60c118225ee65fe668fcd.1697614386.git.andrea.porta@suse.com>
Date:   Wed, 18 Oct 2023 13:13:20 +0200
From:   Andrea della Porta <andrea.porta@...e.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     nik.borisov@...e.com, Andrea della Porta <andrea.porta@...e.com>
Subject: [PATCH 2/4] arm64/process: Make loading of 32bit processes depend on aarch32_enabled()

Major aspect of Aarch32 emulation is the ability to load 32bit
processes.
That's currently decided (among others) by compat_elf_check_arch().

Make the macro use aarch32_enabled() to decide if Aarch32 compat is
enabled before loading a 32bit process.

Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
---
 arch/arm64/kernel/process.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 657ea273c0f9..96832f1ec3ee 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -601,7 +601,7 @@ unsigned long arch_align_stack(unsigned long sp)
 #ifdef CONFIG_COMPAT
 int compat_elf_check_arch(const struct elf32_hdr *hdr)
 {
-	if (!system_supports_32bit_el0())
+	if (!system_supports_32bit_el0() || !aarch32_enabled())
 		return false;
 
 	if ((hdr)->e_machine != EM_ARM)
-- 
2.35.3