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[RFC,5/6] kernel: insn: avoid virt_to_page() translations on core kernel symbols

Message ID 1456330893-19228-6-git-send-email-ard.biesheuvel@linaro.org
State Superseded
Headers show

Commit Message

Ard Biesheuvel Feb. 24, 2016, 4:21 p.m. UTC 
Before restricting virt_to_page() to the linear mapping, ensure that
the text patching code does not use it to resolve references into the
core kernel text, which is mapped in the vmalloc area.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

---
 arch/arm64/kernel/insn.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

-- 
2.5.0


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diff mbox

Patch

diff --git a/arch/arm64/kernel/insn.c b/arch/arm64/kernel/insn.c
index 7371455160e5..219d3a5df142 100644
--- a/arch/arm64/kernel/insn.c
+++ b/arch/arm64/kernel/insn.c
@@ -96,7 +96,7 @@  static void __kprobes *patch_map(void *addr, int fixmap)
 	if (module && IS_ENABLED(CONFIG_DEBUG_SET_MODULE_RONX))
 		page = vmalloc_to_page(addr);
 	else if (!module && IS_ENABLED(CONFIG_DEBUG_RODATA))
-		page = virt_to_page(addr);
+		page = pfn_to_page(__pa(addr) >> PAGE_SHIFT);
 	else
 		return addr;