path: root/lib/dynamic_debug.c
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authorBorislav Petkov <bp@suse.de>2014-02-03 21:41:44 +0100
committerH. Peter Anvin <hpa@zytor.com>2014-02-06 11:11:19 -0800
commit75a1ba5b2c529db60ca49626bcaf0bddf4548438 (patch)
tree3b29eb108807f6e86d67d80f37052c4e7cd1a056 /lib/dynamic_debug.c
parent6583327c4dd55acbbf2a6f25e775b28b3abf9a42 (diff)
x86, microcode, AMD: Unify valid container checks
For additional coverage, BorisO and friends unknowlingly did swap AMD microcode with Intel microcode blobs in order to see what happens. What did happen on 32-bit was [ 5.722656] BUG: unable to handle kernel paging request at be3a6008 [ 5.722693] IP: [<c106d6b4>] load_microcode_amd+0x24/0x3f0 [ 5.722716] *pdpt = 0000000000000000 *pde = 0000000000000000 because there was a valid initrd there but without valid microcode in it and the container check happened *after* the relocated ramdisk handling on 32-bit, which was clearly wrong. While at it, take care of the ramdisk relocation on both 32- and 64-bit as it is done on both. Also, comment what we're doing because this code is a bit tricky. Reported-and-tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: http://lkml.kernel.org/r/1391460104-7261-1-git-send-email-bp@alien8.de Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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