pe: Fix PF in GRUB after memattrs call#772
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rosslagerwall wants to merge 1 commit intorhboot:mainfrom
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The three test failures are build errors and don't seem to be related to the change here. |
The call to update_mem_attrs() takes an aligned pointer within an allocated region but passes the entire size of the allocated region. The result is that Shim may remove execute permission from some pages belonging to GRUB causing a page fault upon returning from the LoadImage call. There are two cases: * When loading the image, set the memory attributes for exactly what we intend to load. * When freeing the image, be cautious and apply the edk2 workaround for the entire allocated region. Fixes: 226fee2 ("PE Loader: support and require NX") Fixes: 2f64bb9 ("loader-protocol: add workaround for EDK2 2025.02 page fault on FreePages") Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
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I've updated the PR with another case that I found (and added Fixes tags). |
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The call to update_mem_attrs() takes an aligned pointer within an allocated region but passes the entire size of the allocated region. The result is that Shim may remove execute permission from some pages belonging to GRUB causing a page fault upon returning from the LoadImage call.