From f988949d7e57f005fba0dbc14491ed9b065c2e36 Mon Sep 17 00:00:00 2001
From: Nathan Ringo <nathan@remexre.com>
Date: Tue, 27 Aug 2024 00:19:53 -0500
Subject: [boards/qemu-virt] Adds a canary for stack overflow.

---
 boards/qemu-virt/qemu-virt.ld | 1 +
 boards/qemu-virt/qemu-virt.s  | 5 +++++
 2 files changed, 6 insertions(+)

(limited to 'boards')

diff --git a/boards/qemu-virt/qemu-virt.ld b/boards/qemu-virt/qemu-virt.ld
index 1b9ff79..1fd3c22 100644
--- a/boards/qemu-virt/qemu-virt.ld
+++ b/boards/qemu-virt/qemu-virt.ld
@@ -29,6 +29,7 @@ SECTIONS {
 	}
 	. = ALIGN(0x1000);
 	.hart0_initial_stack : {
+		PROVIDE(hart0_initial_stack = .);
 		. += 0x1000;
 		PROVIDE(hart0_initial_stack_top = .);
 	}
diff --git a/boards/qemu-virt/qemu-virt.s b/boards/qemu-virt/qemu-virt.s
index b9544be..c7e7642 100644
--- a/boards/qemu-virt/qemu-virt.s
+++ b/boards/qemu-virt/qemu-virt.s
@@ -19,6 +19,11 @@ _start:
 	## Set up hart0's stack.
 	la sp, hart0_initial_stack_top
 
+	## Write a canary to hart0's stack.
+	li t0, 0xdead0bad0defaced
+	la t1, hart0_initial_stack
+	sd t0, (t1)
+
 	## Put the address of the DeviceTree into the first argument position
 	## for hart0_boot.
 	c.mv a0, a1
-- 
cgit v1.2.3