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| author | Darrick J. Wong <djwong@us.ibm.com> | 2008-08-14 15:43:33 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-08-15 13:38:30 +0200 |
| commit | 967060d00d7ab8e992963a966cd3d18156c02d55 (patch) | |
| tree | c11b892999c65d8b1d805191f88b15bf4a058be2 /arch/x86/pci/mmconfig-shared.c | |
| parent | a6825f1c1fa83b1e92b6715ee5771a4d6524d3b9 (diff) | |
x86, msr: fix NULL pointer deref due to msr_open on nonexistent CPUs
msr_open tests for someone trying to open a device for a nonexistent CPU.
However, the function always returns 0, not ret like it should, hence
userspace can BUG the kernel trivially. This bug was introduced by the
cdev lock_kernel pushdown patch last May.
The BUG can be reproduced with these commands:
# mknod fubar c 202 8 <-- pick a number less than NR_CPUS that is not
the number of an online CPU
# cat fubar
Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/pci/mmconfig-shared.c')
0 files changed, 0 insertions, 0 deletions