Description
In the Linux kernel, the following vulnerability has been resolved: riscv: Sync efi page table's kernel mappings before switching The EFI page table is initially created as a copy of the kernel page table. With VMAP_STACK enabled, kernel stacks are allocated in the vmalloc area: if the stack is allocated in a new PGD (one that was not present at the moment of the efi page table creation or not synced in a previous vmalloc fault), the kernel will take a trap when switching to the efi page table when the vmalloc kernel stack is accessed, resulting in a kernel panic. Fix that by updating the efi kernel mappings before switching to the efi page table.
Product status
b91540d52a08b65eb6a2b09132e1bd54fa82754c before fa7a7d185ef380546b4b1fed6f84f31dbae8cec7
b91540d52a08b65eb6a2b09132e1bd54fa82754c before 96f479383d92944406d4b3f2bc03c2f640def9f1
b91540d52a08b65eb6a2b09132e1bd54fa82754c before 3f105a742725a1b78766a55169f1d827732e62b8
5.10
Any version before 5.10
5.15.82
6.0.12
6.1
References
git.kernel.org/...c/fa7a7d185ef380546b4b1fed6f84f31dbae8cec7
git.kernel.org/...c/96f479383d92944406d4b3f2bc03c2f640def9f1
git.kernel.org/...c/3f105a742725a1b78766a55169f1d827732e62b8
