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authorLinus Torvalds <torvalds@linux-foundation.org>2018-05-20 10:36:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-05-20 10:36:52 -0700
commit056ad121c26db1cfc8253222e2297fb7b7577fe8 (patch)
tree803bb45495247af78dd8be3306cc51ed4974af3f /drivers
parent583dbad34098fd2891dcc850744e7c80063dd8a4 (diff)
parent4f74d72aa7067e75af92fbab077e6d7d0210be66 (diff)
downloadlinux-056ad121c26db1cfc8253222e2297fb7b7577fe8.tar.bz2
Merge branch 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
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
Diffstat (limited to 'drivers')
-rw-r--r--drivers/firmware/efi/libstub/arm64-stub.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/firmware/efi/libstub/arm64-stub.c b/drivers/firmware/efi/libstub/arm64-stub.c
index b9bd827caa22..1b4d465cc5d9 100644
--- a/drivers/firmware/efi/libstub/arm64-stub.c
+++ b/drivers/firmware/efi/libstub/arm64-stub.c
@@ -98,6 +98,16 @@ efi_status_t handle_kernel_image(efi_system_table_t *sys_table_arg,
(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.
*/