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x86/mm: Use the correct function type for native_set_fixmap() 

We call native_set_fixmap indirectly through the function pointer
struct pv_mmu_ops::set_fixmap, which expects the first parameter to be
'unsigned' instead of 'enum fixed_addresses'. This patch changes the
function type for native_set_fixmap to match the pointer, which fixes
indirect call mismatches with Control-Flow Integrity (CFI) checking.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H . Peter Anvin <hpa@zytor.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190913211402.193018-1-samitolvanen@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
alistair/sunxi64-5.5-dsi
Sami Tolvanen 2019-09-13 14:14:02 -07:00 committed by Ingo Molnar
parent 6e4847640c
commit f53e2cd0b8
2 changed files with 3 additions and 3 deletions
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2
arch/x86/include/asm/fixmap.h
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@ -156,7 +156,7 @@ extern pte_t *kmap_pte;
extern pte_t *pkmap_page_table;
void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
void native_set_fixmap(enum fixed_addresses idx,
void native_set_fixmap(unsigned /* enum fixed_addresses */ idx,
phys_addr_t phys, pgprot_t flags);
#ifndef CONFIG_PARAVIRT_XXL

4
arch/x86/mm/pgtable.c
View File

@ -643,8 +643,8 @@ void __native_set_fixmap(enum fixed_addresses idx, pte_t pte)
fixmaps_set++;
}
void native_set_fixmap(enum fixed_addresses idx, phys_addr_t phys,
pgprot_t flags)
void native_set_fixmap(unsigned /* enum fixed_addresses */ idx,
phys_addr_t phys, pgprot_t flags)
{
/* Sanitize 'prot' against any unsupported bits: */
pgprot_val(flags) &= __default_kernel_pte_mask;