x86: check physical address range in ioremap
authorThomas Gleixner <tglx@linutronix.de>
Wed, 27 Feb 2008 19:57:40 +0000 (20:57 +0100)
committerIngo Molnar <mingo@elte.hu>
Thu, 17 Apr 2008 15:40:51 +0000 (17:40 +0200)
commite3100c82abd9aa643dc15828202aceeae3504e03
treedc4e1b69224a9e795fa9058dcc97c6e77cb71d4d
parentb8c2d3dfbc117dff26058fbac316b8acfc2cb5f7
x86: check physical address range in ioremap

Roland Dreier reported in http://lkml.org/lkml/2008/2/27/194

[ 8425.915139] BUG: unable to handle kernel paging request at ffffc20001a0a000
[ 8425.919087] IP: [<ffffffff8021dacc>] clflush_cache_range+0xc/0x25
[ 8425.919087] PGD 1bf80e067 PUD 1bf80f067 PMD 1bb497067 PTE 80000047000ee17b

This is on a Intel machine with 36bit physical address space. The PTE
entry references 47000ee000, which is outside of it.

Add a check for the physical address space and warn/printk about the
stupid caller.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/x86/mm/ioremap.c