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x86/microcode: Allow only "1" as a late reload trigger value

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Microcode gets reloaded late only if "1" is written to the reload file.
However, the code silently treats any other unsigned integer as a
successful write even though no actions are performed to load microcode.

Make the loader more strict to accept only "1" as a trigger value and
return an error otherwise.

  [ bp: Massage commit message. ]

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230130213955.6046-3-ashok.raj@intel.com
This commit is contained in:
Ashok Raj 2023-01-30 13:39:48 -08:00 committed by Borislav Petkov (AMD)
parent a9a5cac225
commit 25d0dc4b95
1 changed files with 2 additions and 5 deletions
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7
arch/x86/kernel/cpu/microcode/core.c
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@ -475,11 +475,8 @@ static ssize_t reload_store(struct device *dev,
ssize_t ret = 0;
ret = kstrtoul(buf, 0, &val);
if (ret)
return ret;
if (val != 1)
return size;
if (ret || val != 1)
return -EINVAL;
cpus_read_lock();