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authorH.J. Lu <hjl.tools@gmail.com>2018-03-19 14:08:11 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-03-28 18:40:16 +0200
commitb18864167de00eb04820d1f7c6fa04bacbba43e7 (patch)
tree55fc02ce8a9f4df140ad04e3089334a9238d7f62
parent073bb7ddd35ca8f17a170258dacbe384935a43c8 (diff)
x86/boot/64: Verify alignment of the LOAD segment
commit c55b8550fa57ba4f5e507be406ff9fc2845713e8 upstream. Since the x86-64 kernel must be aligned to 2MB, refuse to boot the kernel if the alignment of the LOAD segment isn't a multiple of 2MB. Signed-off-by: H.J. Lu <hjl.tools@gmail.com> Cc: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Eric Biederman <ebiederm@xmission.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Juergen Gross <jgross@suse.com> Cc: Kees Cook <keescook@chromium.org> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/CAMe9rOrR7xSJgUfiCoZLuqWUwymRxXPoGBW38%2BpN%3D9g%2ByKNhZw@mail.gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/x86/boot/compressed/misc.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 79dac1758e7c..16df89c30c20 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -366,6 +366,10 @@ static void parse_elf(void *output)
switch (phdr->p_type) {
case PT_LOAD:
+#ifdef CONFIG_X86_64
+ if ((phdr->p_align % 0x200000) != 0)
+ error("Alignment of LOAD segment isn't multiple of 2MB");
+#endif
#ifdef CONFIG_RELOCATABLE
dest = output;
dest += (phdr->p_paddr - LOAD_PHYSICAL_ADDR);