1. 20 Mar, 2015 1 commit
    • Will Deacon's avatar
      arm64: efi: don't restore TTBR0 if active_mm points at init_mm · 130c93fd
      Will Deacon authored
      
      
      init_mm isn't a normal mm: it has swapper_pg_dir as its pgd (which
      contains kernel mappings) and is used as the active_mm for the idle
      thread.
      
      When restoring the pgd after an EFI call, we write current->active_mm
      into TTBR0. If the current task is actually the idle thread (e.g. when
      initialising the EFI RTC before entering userspace), then the TLB can
      erroneously populate itself with junk global entries as a result of
      speculative table walks.
      
      When we do eventually return to userspace, the task can end up hitting
      these junk mappings leading to lockups, corruption or crashes.
      
      This patch fixes the problem in the same way as the CPU suspend code by
      ensuring that we never switch to the init_mm in efi_set_pgd and instead
      point TTBR0 at the zero page. A check is also added to cpu_switch_mm to
      BUG if we get passed swapper_pg_dir.
      Reviewed-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
      Fixes: f3cdfd23
      
       ("arm64/efi: move SetVirtualAddressMap() to UEFI stub")
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
      Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      130c93fd
  2. 14 Mar, 2015 3 commits
  3. 12 Mar, 2015 1 commit
    • Chen Gang's avatar
      arch/c6x/include/asm/pgtable.h: define dummy pgprot_writecombine for !MMU · 65b9ab88
      Chen Gang authored
      
      
      When !MMU, asm-generic will not define default pgprot_writecombine, so c6x
      needs to define it by itself.  The related error:
      
          CC [M]  fs/pstore/ram_core.o
        fs/pstore/ram_core.c: In function 'persistent_ram_vmap':
        fs/pstore/ram_core.c:399:10: error: implicit declaration of function 'pgprot_writecombine' [-Werror=implicit-function-declaration]
           prot = pgprot_writecombine(PAGE_KERNEL);
                  ^
        fs/pstore/ram_core.c:399:8: error: incompatible types when assigning to type 'pgprot_t {aka struct <anonymous>}' from type 'int'
           prot = pgprot_writecombine(PAGE_KERNEL);
                ^
      Signed-off-by: default avatarChen Gang <gang.chen.5i5j@gmail.com>
      Cc: Mark Salter <msalter@redhat.com>
      Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
      Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      65b9ab88
  4. 11 Mar, 2015 9 commits
  5. 10 Mar, 2015 2 commits
  6. 09 Mar, 2015 1 commit
  7. 06 Mar, 2015 12 commits
  8. 05 Mar, 2015 6 commits
  9. 04 Mar, 2015 5 commits