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| author | Jiri Slaby <jirislaby@gmail.com> | 2009-10-26 11:11:43 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-10-26 12:38:59 +0100 |
| commit | 72ed7de74e8f0fad0d8e567ae1f987b740accb3f (patch) | |
| tree | dd8e7dbd4b6305bcca35fc2cfe29479918e034d2 /arch/x86/kernel/pcspeaker.c | |
| parent | x86: Side-step lguest problem by only building cmpxchg8b_emu for pre-Pentium (diff) | |
| download | linux-72ed7de74e8f0fad0d8e567ae1f987b740accb3f.tar.xz linux-72ed7de74e8f0fad0d8e567ae1f987b740accb3f.zip | |
x86: crash_dump: Fix non-pae kdump kernel memory accesses
Non-PAE 32-bit dump kernels may wrap an address around 4G and
poke unwanted space. ptes there are 32-bit long, and since
pfn << PAGE_SIZE may exceed this limit, high pfn bits are
cropped and wrong address mapped by kmap_atomic_pfn in
copy_oldmem_page.
Don't allow this behavior in non-PAE kdump kernels by checking
pfns passed into copy_oldmem_page. In the case of failure,
userspace process gets EFAULT.
[v2]
- fix comments
- move ifdefs inside the function
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Simon Horman <horms@verge.net.au>
Cc: Paul Mundt <lethal@linux-sh.org>
LKML-Reference: <1256551903-30567-1-git-send-email-jirislaby@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/pcspeaker.c')
0 files changed, 0 insertions, 0 deletions