Re: [PATCH v2] arm64: io: Reject non-user protection in ioremap_prot()
From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2026-09-16 12:35:20
Also in:
lkml
On Fri, Sep 11, 2026 at 09:58:59AM +0800, Zeng Heng wrote:
quoted hunk ↗ jump to hunk
diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h index 21c8e400107c..31e67f6bd4a7 100644 --- a/arch/arm64/include/asm/io.h +++ b/arch/arm64/include/asm/io.h@@ -272,7 +272,8 @@ static inline void __iomem *ioremap_prot(phys_addr_t phys, size_t size, pgprot_t prot; ptval_t user_prot_val = pgprot_val(user_prot); - if (WARN_ON_ONCE(!(user_prot_val & PTE_USER))) + /* Reject PROT_NONE and exec-only */ + if (!(user_prot_val & PTE_USER)) return NULL; prot = __pgprot_modify(PAGE_KERNEL, PTE_ATTRINDX_MASK,
Looks alright to me: Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> It would be good to get Sashiko's finding sorted out as well (pre-existing issue). I reckon that should go in the core code. -- Catalin