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Merge branch 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull EFI fixes from Thomas Gleixner:

 - Use explicitely sized type for the romimage pointer in the 32bit EFI
   protocol struct so a 64bit kernel does not expand it to 64bit. Ditto
   for the 64bit struct to avoid the reverse issue on 32bit kernels.

 - Handle randomized tex offset correctly in the ARM64 EFI stub to avoid
   unaligned data resulting in stack corruption and other hard to
   diagnose wreckage.

* 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  efi/libstub/arm64: Handle randomized TEXT_OFFSET
  efi: Avoid potential crashes, fix the 'struct efi_pci_io_protocol_32' definition for mixed mode
This commit is contained in:
Linus Torvalds 2018-05-20 10:36:52 -07:00
commit 056ad121c2
3 changed files with 18 additions and 6 deletions
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10
drivers/firmware/efi/libstub/arm64-stub.c
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@ -97,6 +97,16 @@ efi_status_t handle_kernel_image(efi_system_table_t *sys_table_arg,
u32 offset = !IS_ENABLED(CONFIG_DEBUG_ALIGN_RODATA) ?
(phys_seed >> 32) & mask : TEXT_OFFSET;
/*
* With CONFIG_RANDOMIZE_TEXT_OFFSET=y, TEXT_OFFSET may not
* be a multiple of EFI_KIMG_ALIGN, and we must ensure that
* we preserve the misalignment of 'offset' relative to
* EFI_KIMG_ALIGN so that statically allocated objects whose
* alignment exceeds PAGE_SIZE appear correctly aligned in
* memory.
*/
offset |= TEXT_OFFSET % EFI_KIMG_ALIGN;
/*
* If KASLR is enabled, and we have some randomness available,
* locate the kernel at a randomized offset in physical memory.