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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 fixes from Thomas Gleixner:
 "This set of updates contains:

   - Another bugfix for the pathologic vm86 machinery.  Clear
     thread.vm86 on fork to prevent corrupting the parent state.  This
     comes along with an update to the vm86 selftest case

   - Fix another corner case in the ioapic setup code which causes a
     boot crash on some oddball systems

   - Fix the fallout from the dma allocation consolidation work, which
     leads to a NULL pointer dereference when the allocation code is
     called with a NULL device"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/vm86: Set thread.vm86 to NULL on fork/clone
  selftests/x86: Add a fork() to entry_from_vm86 to catch fork bugs
  x86/ioapic: Prevent NULL pointer dereference in setup_ioapic_dest()
  x86/dma-mapping: Fix arch_dma_alloc_attrs() oops with NULL dev
This commit is contained in:
Linus Torvalds 2015-11-01 11:45:26 -08:00
commit ca04d396a3
4 changed files with 13 additions and 3 deletions
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4
arch/x86/kernel/apic/io_apic.c
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@ -2547,7 +2547,9 @@ void __init setup_ioapic_dest(void)
mask = apic->target_cpus();
chip = irq_data_get_irq_chip(idata);
chip->irq_set_affinity(idata, mask, false);
/* Might be lapic_chip for irq 0 */
if (chip->irq_set_affinity)
chip->irq_set_affinity(idata, mask, false);
}
}
#endif

5
arch/x86/kernel/pci-dma.c
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@ -131,11 +131,12 @@ void dma_generic_free_coherent(struct device *dev, size_t size, void *vaddr,
bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp)
{
if (!*dev)
*dev = &x86_dma_fallback_dev;
*gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
*gfp = dma_alloc_coherent_gfp_flags(*dev, *gfp);
if (!*dev)
*dev = &x86_dma_fallback_dev;
if (!is_device_dma_capable(*dev))
return false;
return true;

3
arch/x86/kernel/process.c
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@ -84,6 +84,9 @@ EXPORT_SYMBOL_GPL(idle_notifier_unregister);
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
{
memcpy(dst, src, arch_task_struct_size);
#ifdef CONFIG_VM86
dst->thread.vm86 = NULL;
#endif
return fpu__copy(&dst->thread.fpu, &src->thread.fpu);
}

4
tools/testing/selftests/x86/entry_from_vm86.c
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@ -230,5 +230,9 @@ int main(void)
}
clearhandler(SIGSEGV);
/* Make sure nothing explodes if we fork. */
if (fork() > 0)
return 0;
return (nerrs == 0 ? 0 : 1);
}