x86/microcode/AMD: Add microcode container verification

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Add container and patch verification functions to the AMD microcode
update driver.

These functions check whether a passed buffer contains the relevant
structure, whether it isn't truncated and (for actual microcode patches)
whether the size of a patch is not too large for a particular CPU family.
By adding these checks as separate functions the actual microcode loading
code won't get interspersed with a lot of checks and so will be more
readable.

 [ bp: Make all pr_err() calls into pr_debug() and drop the
   verify_patch() bits. ]

Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: x86-ml <x86@kernel.org>
Link: http://lkml.kernel.org/r/3014e96c82cd90761b4601bd2cfe59c4119e46a7.1529424596.git.mail@maciej.szmigiero.name

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This commit is contained in:

Maciej S. Szmigiero 2018-06-19 20:47:32 +02:00 • committed by Borislav Petkov

parent 479229d160

commit f4ff25916c

1 changed files with 101 additions and 0 deletions

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arch/x86/kernel/cpu/microcode/amd.c

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