From 6d5a88cd0c1506115d71a4d3a26b60645c89df6c Mon Sep 17 00:00:00 2001 From: Marco Elver Date: Mon, 14 Dec 2020 19:09:24 -0800 Subject: lkdtm: disable KASAN for rodata.o Building lkdtm with KASAN and Clang 11 or later results in the following error when attempting to load the module: kernel tried to execute NX-protected page - exploit attempt? (uid: 0) BUG: unable to handle page fault for address: ffffffffc019cd70 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0011) - permissions violation ... RIP: 0010:asan.module_ctor+0x0/0xffffffffffffa290 [lkdtm] ... Call Trace: do_init_module+0x17c/0x570 load_module+0xadee/0xd0b0 __x64_sys_finit_module+0x16c/0x1a0 do_syscall_64+0x34/0x50 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The reason is that rodata.o generates a dummy function that lives in .rodata to validate that .rodata can't be executed; however, Clang 11 adds KASAN globals support by generating module constructors to initialize globals redzones. When Clang 11 adds a module constructor to rodata.o, it is also added to .rodata: any attempt to call it on initialization results in the above error. Therefore, disable KASAN instrumentation for rodata.o. Link: https://lkml.kernel.org/r/20201214191413.3164796-1-elver@google.com Signed-off-by: Marco Elver Cc: Kees Cook Cc: Arnd Bergmann Cc: Greg Kroah-Hartman Cc: Andrey Konovalov Cc: Dmitry Vyukov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/misc/lkdtm/Makefile | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/misc') diff --git a/drivers/misc/lkdtm/Makefile b/drivers/misc/lkdtm/Makefile index c70b3822013f..1c4c7aca0026 100644 --- a/drivers/misc/lkdtm/Makefile +++ b/drivers/misc/lkdtm/Makefile @@ -11,6 +11,7 @@ lkdtm-$(CONFIG_LKDTM) += usercopy.o lkdtm-$(CONFIG_LKDTM) += stackleak.o lkdtm-$(CONFIG_LKDTM) += cfi.o +KASAN_SANITIZE_rodata.o := n KASAN_SANITIZE_stackleak.o := n KCOV_INSTRUMENT_rodata.o := n -- cgit v1.2.3