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(parent: f490e07) | patch
x86/cpu_entry_area: Add guard page for entry stack on 32bit
authorThomas Gleixner <tglx@linutronix.de>
Wed, 20 Nov 2019 23:40:24 +0000 (00:40 +0100)
committerPeter Zijlstra <peterz@infradead.org>
Thu, 21 Nov 2019 18:37:43 +0000 (19:37 +0100)
commit880a98c339961eaa074393e3a2117cbe9125b8bb
treee7730f252db8af6007070060c9b2c8a3394b9110tree | snapshot
parentf490e07c53d66045d9d739e134145ec9b38653d3commit | diff
x86/cpu_entry_area: Add guard page for entry stack on 32bit

The entry stack in the cpu entry area is protected against overflow by the
readonly GDT on 64-bit, but on 32-bit the GDT needs to be writeable and
therefore does not trigger a fault on stack overflow.

Add a guard page.

Fixes: c482feefe1ae ("x86/entry/64: Make cpu_entry_area.tss read-only")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: stable@kernel.org
arch/x86/include/asm/cpu_entry_area.h diff | blob | history
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