Commit 14b46ba9 authored Nov 20, 2025 by Thomas Bogendoerfer

MIPS: kernel: Fix random segmentation faults



Commit 69896119 ("MIPS: vdso: Switch to generic storage
implementation") switches to a generic vdso storage, which increases
the number of data pages from 1 to 4. But there is only one page
reserved, which causes segementation faults depending where the VDSO
area is randomized to. To fix this use the same size of reservation
and allocation of the VDSO data pages.

Fixes: 69896119 ("MIPS: vdso: Switch to generic storage implementation")
Reviewed-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Huacai Chen <chenhuacai@loongson.cn>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

parent 9f048fa4

arch/mips/kernel/process.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -692,7 +692,7 @@ unsigned long mips_stack_top(void)
		/* Space for the VDSO, data page & GIC user page */
		if (current->thread.abi) {
		top -= PAGE_ALIGN(current->thread.abi->vdso->size);
		top -= PAGE_SIZE;
		top -= VDSO_NR_PAGES * PAGE_SIZE;
		top -= mips_gic_present() ? PAGE_SIZE : 0;

		/* Space to randomize the VDSO base */