genirq: Prevent access beyond allocated_irqs bitmap
Lars-Peter Clausen pointed out: I stumbled upon this while looking through the existing archs using SPARSE_IRQ. Even with SPARSE_IRQ the NR_IRQS is still the upper limit for the number of IRQs. Both PXA and MMP set NR_IRQS to IRQ_BOARD_START, with IRQ_BOARD_START being the number of IRQs used by the core. In various machine files the nr_irqs field of the ARM machine defintion struct is then set to "IRQ_BOARD_START + NR_BOARD_IRQS". As a result "nr_irqs" will greater then NR_IRQS which then again causes the "allocated_irqs" bitmap in the core irq code to be accessed beyond its size overwriting unrelated data. The core code really misses a sanity check there. This went unnoticed so far as by chance the compiler/linker places data behind that bitmap which gets initialized later on those affected platforms. So the obvious fix would be to add a sanity check in early_irq_init() and break all affected platforms. Though that check wants to be backported to stable as well, which will require to fix all known problematic platforms and probably some more yet not known ones as well. Lots of churn. A way simpler solution is to allocate a slightly larger bitmap and avoid the whole churn w/o breaking anything. Add a few warnings when an arch returns utter crap. Reported-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: stable@kernel.org # .37 Cc: Haojian Zhuang <haojian.zhuang@marvell.com> Cc: Eric Miao <eric.y.miao@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org>
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@ -3,6 +3,12 @@
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*/
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#include <linux/irqdesc.h>
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#ifdef CONFIG_SPARSE_IRQ
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# define IRQ_BITMAP_BITS (NR_IRQS + 8196)
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#else
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# define IRQ_BITMAP_BITS NR_IRQS
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#endif
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extern int noirqdebug;
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#define irq_data_to_desc(data) container_of(data, struct irq_desc, irq_data)
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@ -94,7 +94,7 @@ int nr_irqs = NR_IRQS;
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EXPORT_SYMBOL_GPL(nr_irqs);
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static DEFINE_MUTEX(sparse_irq_lock);
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static DECLARE_BITMAP(allocated_irqs, NR_IRQS);
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static DECLARE_BITMAP(allocated_irqs, IRQ_BITMAP_BITS);
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#ifdef CONFIG_SPARSE_IRQ
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@ -217,6 +217,15 @@ int __init early_irq_init(void)
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initcnt = arch_probe_nr_irqs();
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printk(KERN_INFO "NR_IRQS:%d nr_irqs:%d %d\n", NR_IRQS, nr_irqs, initcnt);
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if (WARN_ON(nr_irqs > IRQ_BITMAP_BITS))
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nr_irqs = IRQ_BITMAP_BITS;
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if (WARN_ON(initcnt > IRQ_BITMAP_BITS))
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initcnt = IRQ_BITMAP_BITS;
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if (initcnt > nr_irqs)
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nr_irqs = initcnt;
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for (i = 0; i < initcnt; i++) {
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desc = alloc_desc(i, node);
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set_bit(i, allocated_irqs);
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@ -23,7 +23,7 @@
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#ifdef CONFIG_HARDIRQS_SW_RESEND
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/* Bitmap to handle software resend of interrupts: */
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static DECLARE_BITMAP(irqs_resend, NR_IRQS);
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static DECLARE_BITMAP(irqs_resend, IRQ_BITMAP_BITS);
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/*
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* Run software resends of IRQ's
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