# HG changeset patch # User Alex Olson <alex.ol...@starlab.io> # Date 1634323050 18000 # Fri Oct 15 13:37:30 2021 -0500 # Node ID 06433602ffe048ceb946d538d51620ae8152c93d # Parent f3574795bf2ecbd0e717268f9cb9ccc8982f1861 Ensure that growth of Multiboot tags does not go beyond original area
The grow_mb2_tag() function can only rearrange Multiboot content within the area originally allocated by the parent bootloader (Grub). This revision ensures that boot will not continue if the expansion of a tag would overflow the original area. In practice, small expansions as a result of tboot added content are normally "paid for" through tboot's removal of other tags. Signed-off-by: Alex Olson <alex.ol...@starlab.io> diff -r f3574795bf2e -r 06433602ffe0 tboot/common/loader.c --- a/tboot/common/loader.c Tue Oct 19 13:53:09 2021 -0500 +++ b/tboot/common/loader.c Fri Oct 15 13:37:30 2021 -0500 @@ -375,6 +375,7 @@ if (growth > slack){ printk(TBOOT_ERR"YIKES!!! grow_mb2_tag slack %d < growth %d\n", slack, growth); + apply_policy(TB_ERR_FATAL); } /* now we copy down from the bottom, going up */ _______________________________________________ tboot-devel mailing list tboot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/tboot-devel