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23 October 2021, 00:29:24 UTC
Revision 68d929862e29a8b52a7f2f2f86a0600423b093cd authored by Matthew Garrett on 03 March 2013, 00:40:17 UTC, committed by Matt Fleming on 06 March 2013, 14:43:29 UTC 
efi: be more paranoid about available space when creating variables
 
UEFI variables are typically stored in flash. For various reasons, avaiable
space is typically not reclaimed immediately upon the deletion of a
variable - instead, the system will garbage collect during initialisation
after a reboot.

Some systems appear to handle this garbage collection extremely poorly,
failing if more than 50% of the system flash is in use. This can result in
the machine refusing to boot. The safest thing to do for the moment is to
forbid writes if they'd end up using more than half of the storage space.
We can make this more finegrained later if we come up with a method for
identifying the broken machines.

Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
Cc: Josh Boyer <jwboyer@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
1 parent 6dbe51c
History
Tip revision: 68d929862e29a8b52a7f2f2f86a0600423b093cd authored by Matthew Garrett on 03 March 2013, 00:40:17 UTC
efi: be more paranoid about available space when creating variables
Tip revision: 68d9298
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