x86/boot/64/clang: Use fixup_pointer() to access 'next_early_pgt'

__startup_64() is normally using fixup_pointer() to access globals in a
position-independent fashion. However 'next_early_pgt' was accessed
directly, which wasn't guaranteed to work.

Luckily GCC was generating a R_X86_64_PC32 PC-relative relocation for
'next_early_pgt', but Clang emitted a R_X86_64_32S, which led to
accessing invalid memory and rebooting the kernel.

Signed-off-by: Alexander Potapenko <glider@google.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Davidson <md@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: c88d71508e36 ("x86/boot/64: Rewrite startup_64() in C")
Link: http://lkml.kernel.org/r/20170816190808.131748-1-glider@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 4 insertions, 3 deletions

diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 46c3c73e7f43..9ba79543d9ee 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -53,6 +53,7 @@ void __head __startup_64(unsigned long physaddr)
         pudval_t *pud;
         pmdval_t *pmd, pmd_entry;
         int i;
+        unsigned int *next_pgt_ptr;
 
         /* Is the address too large? */
         if (physaddr >> MAX_PHYSMEM_BITS)
@@ -91,9 +92,9 @@ void __head __startup_64(unsigned long physaddr)
          * creates a bunch of nonsense entries but that is fine --
          * it avoids problems around wraparound.
          */
-
-        pud = fixup_pointer(early_dynamic_pgts[next_early_pgt++], physaddr);
-        pmd = fixup_pointer(early_dynamic_pgts[next_early_pgt++], physaddr);
+        next_pgt_ptr = fixup_pointer(&next_early_pgt, physaddr);
+        pud = fixup_pointer(early_dynamic_pgts[(*next_pgt_ptr)++], physaddr);
+        pmd = fixup_pointer(early_dynamic_pgts[(*next_pgt_ptr)++], physaddr);
 
         if (IS_ENABLED(CONFIG_X86_5LEVEL)) {
                 p4d = fixup_pointer(early_dynamic_pgts[next_early_pgt++], physaddr);