On Wed, Aug 25, 2021 at 05:59:01AM +0800, kernel test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > head: 372b2891c15acbf7b90d948b08ac174bde77102c > commit: 185e297653a7e0431db813764d2efb9ffd09160c [8858/10077] fortify: Explicitly disable Clang support > config: i386-randconfig-a016-20210824 (attached as .config) > compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d26000e4cc2bc65e207a84fa26cb6e374d60aa12) > reproduce (this is a W=1 build): > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=185e297653a7e0431db813764d2efb9ffd09160c > git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git > git fetch --no-tags linux-next master > git checkout 185e297653a7e0431db813764d2efb9ffd09160c > # save the attached .config to linux build tree > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=i386 > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <lkp@xxxxxxxxx> > > All warnings (new ones prefixed by >>): > > clang-14: warning: optimization flag '-falign-jumps=0' is not supported [-Wignored-optimization-argument] > In file included from fs/statfs.c:2: > In file included from include/linux/syscalls.h:76: > In file included from include/uapi/linux/aio_abi.h:31: > In file included from include/linux/fs.h:6: > In file included from include/linux/wait_bit.h:8: > In file included from include/linux/wait.h:9: > In file included from include/linux/spinlock.h:51: > In file included from include/linux/preempt.h:78: > In file included from arch/x86/include/asm/preempt.h:7: > In file included from include/linux/thread_info.h:60: > arch/x86/include/asm/thread_info.h:172:13: warning: calling '__builtin_frame_address' with a nonzero argument is unsafe [-Wframe-address] > oldframe = __builtin_frame_address(1); > ^~~~~~~~~~~~~~~~~~~~~~~~~~ > arch/x86/include/asm/thread_info.h:174:11: warning: calling '__builtin_frame_address' with a nonzero argument is unsafe [-Wframe-address] > frame = __builtin_frame_address(2); > ^~~~~~~~~~~~~~~~~~~~~~~~~~ > In file included from fs/statfs.c:2: > In file included from include/linux/syscalls.h:87: > In file included from include/trace/syscall.h:7: > In file included from include/linux/trace_events.h:10: > In file included from include/linux/perf_event.h:49: > In file included from include/linux/ftrace.h:22: > arch/x86/include/asm/ftrace.h:7:3: error: Compiler does not support fentry? > # error Compiler does not support fentry? > ^ > In file included from fs/statfs.c:2: > In file included from include/linux/syscalls.h:87: > In file included from include/trace/syscall.h:7: > In file included from include/linux/trace_events.h:10: > In file included from include/linux/perf_event.h:49: > include/linux/ftrace.h:843:9: warning: calling '__builtin_return_address' with a nonzero argument is unsafe [-Wframe-address] > addr = CALLER_ADDR1; > ^~~~~~~~~~~~ > include/linux/ftrace.h:830:38: note: expanded from macro 'CALLER_ADDR1' > #define CALLER_ADDR1 ((unsigned long)ftrace_return_address(1)) > ^~~~~~~~~~~~~~~~~~~~~~~~ > include/linux/ftrace.h:823:36: note: expanded from macro 'ftrace_return_address' > # define ftrace_return_address(n) __builtin_return_address(n) > ^~~~~~~~~~~~~~~~~~~~~~~~~~~ > include/linux/ftrace.h:846:9: warning: calling '__builtin_return_address' with a nonzero argument is unsafe [-Wframe-address] > return CALLER_ADDR2; > ^~~~~~~~~~~~ > include/linux/ftrace.h:831:38: note: expanded from macro 'CALLER_ADDR2' > #define CALLER_ADDR2 ((unsigned long)ftrace_return_address(2)) > ^~~~~~~~~~~~~~~~~~~~~~~~ > include/linux/ftrace.h:823:36: note: expanded from macro 'ftrace_return_address' > # define ftrace_return_address(n) __builtin_return_address(n) > ^~~~~~~~~~~~~~~~~~~~~~~~~~~ > >> fs/statfs.c:131:3: warning: 'memcpy' will always overflow; destination buffer has size 64, but size argument is 84 [-Wfortify-source] > memcpy(&buf, st, sizeof(*st)); > ^ > arch/x86/include/asm/string_32.h:182:25: note: expanded from macro 'memcpy' > #define memcpy(t, f, n) __builtin_memcpy(t, f, n) > ^ > 5 warnings and 1 error generated. > > > vim +/memcpy +131 fs/statfs.c > > c8b91accfa1059 Al Viro 2011-03-12 125 > c8b91accfa1059 Al Viro 2011-03-12 126 static int do_statfs_native(struct kstatfs *st, struct statfs __user *p) > c8b91accfa1059 Al Viro 2011-03-12 127 { > c8b91accfa1059 Al Viro 2011-03-12 128 struct statfs buf; > 7ed1ee6118ae77 Al Viro 2010-03-23 129 > c8b91accfa1059 Al Viro 2011-03-12 130 if (sizeof(buf) == sizeof(*st)) > c8b91accfa1059 Al Viro 2011-03-12 @131 memcpy(&buf, st, sizeof(*st)); Wat. Statement above this makes that assertion impossible. -- Kees Cook
