path: root/kernel/audit.c
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authorMatthew Garrett <matthewgarrett@google.com>2019-06-07 13:51:47 -0700
committerJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2019-06-24 23:57:50 +0300
commit166a2809d65b282272c474835ec22c882a39ca1b (patch)
tree3ad4681aa56962a7834f8ad6c8a45d1ec73e3c59 /kernel/audit.c
parent82d736ac56d7cd78696c5234853684bad05efadf (diff)
tpm: Don't duplicate events from the final event log in the TCG2 log
After the first call to GetEventLog() on UEFI systems using the TCG2 crypto agile log format, any further log events (other than those triggered by ExitBootServices()) will be logged in both the main log and also in the Final Events Log. While the kernel only calls GetEventLog() immediately before ExitBootServices(), we can't control whether earlier parts of the boot process have done so. This will result in log entries that exist in both logs, and so the current approach of simply appending the Final Event Log to the main log will result in events being duplicated. We can avoid this problem by looking at the size of the Final Event Log just before we call ExitBootServices() and exporting this to the main kernel. The kernel can then skip over all events that occured before ExitBootServices() and only append events that were not also logged to the main log. Signed-off-by: Matthew Garrett <mjg59@google.com> Reported-by: Joe Richey <joerichey@google.com> Suggested-by: Joe Richey <joerichey@google.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Diffstat (limited to 'kernel/audit.c')
0 files changed, 0 insertions, 0 deletions

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