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arm64: consolidate rox page protection logic

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Consolidate the arm64 decision making for the page protections used
for executable pages, used by both the trampoline code and the kernel
text mapping code.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://lore.kernel.org/r/E1q9T3v-00EDmW-BH@rmk-PC.armlinux.org.uk
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Russell King 2023-06-14 17:09:35 +01:00 committed by Catalin Marinas
parent f6794950f0
commit 601eaec513
1 changed files with 7 additions and 2 deletions
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9
arch/arm64/mm/mmu.c
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@ -663,12 +663,17 @@ static void __init map_kernel_segment(pgd_t *pgdp, void *va_start, void *va_end,
vm_area_add_early(vma);
}
static pgprot_t kernel_exec_prot(void)
{
return rodata_enabled ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC;
}
#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
static int __init map_entry_trampoline(void)
{
int i;
pgprot_t prot = rodata_enabled ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC;
pgprot_t prot = kernel_exec_prot();
phys_addr_t pa_start = __pa_symbol(__entry_tramp_text_start);
/* The trampoline is always mapped and can therefore be global */
@ -723,7 +728,7 @@ static void __init map_kernel(pgd_t *pgdp)
* mapping to install SW breakpoints. Allow this (only) when
* explicitly requested with rodata=off.
*/
pgprot_t text_prot = rodata_enabled ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC;
pgprot_t text_prot = kernel_exec_prot();
/*
* If we have a CPU that supports BTI and a kernel built for