linux-kernel - [PATCH] MIPS: kernel: Fix reservation for VDSO area

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Message-ID: <20251117191815.69556-1-tsbogend@alpha.franken.de>
Date: Mon, 17 Nov 2025 20:18:14 +0100
From: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To: Nam Cao <namcao@...utronix.de>,
	Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-mips@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] MIPS: kernel: Fix reservation for VDSO area

Commit 69896119dc9d ("MIPS: vdso: Switch to generic storage
implementation") switches to a generic vdso storage, but missed to adapt
the max stack top by the number of generic VDSO pages.

Fixes: 69896119dc9d ("MIPS: vdso: Switch to generic storage implementation")
Signed-off-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
---
 arch/mips/kernel/process.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 29191fa1801e..9eb5b26d4b5f 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -693,6 +693,7 @@ unsigned long mips_stack_top(void)
 	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 */
-- 
2.43.0