tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/mst/vhost.git linux-next head: f2c4b499aecc0c5a1ec67f3a2a7310cb7168a8ab commit: 4c145987a955269da79312a79ec26638712644bb [8/9] vhost: block speculation of translated descriptors config: mips-malta_kvm_defconfig (attached as .config) compiler: mipsel-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 4c145987a955269da79312a79ec26638712644bb # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=mips If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> All error/warnings (new ones prefixed by >>): In file included from include/linux/kernel.h:11:0, from include/linux/list.h:9, from include/linux/wait.h:7, from include/linux/eventfd.h:13, from drivers/vhost/vhost.c:13: drivers/vhost/vhost.c: In function 'translate_desc': >> include/linux/compiler.h:350:38: error: call to '__compiletime_assert_2077' declared with attribute error: BUILD_BUG_ON failed: sizeof(_s) > sizeof(long) _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__) ^ include/linux/compiler.h:331:4: note: in definition of macro '__compiletime_assert' prefix ## suffix(); \ ^~~~~~ include/linux/compiler.h:350:2: note: in expansion of macro '_compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__) ^~~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert' #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) ^~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG' BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) ^~~~~~~~~~~~~~~~ >> include/linux/nospec.h:55:2: note: in expansion of macro 'BUILD_BUG_ON' BUILD_BUG_ON(sizeof(_i) > sizeof(long)); \ ^~~~~~~~~~~~ >> drivers/vhost/vhost.c:2076:5: note: in expansion of macro 'array_index_nospec' array_index_nospec(addr - node->start, ^~~~~~~~~~~~~~~~~~ >> include/linux/compiler.h:350:38: error: call to '__compiletime_assert_2077' declared with attribute error: BUILD_BUG_ON failed: sizeof(_s) > sizeof(long) _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__) ^ include/linux/compiler.h:331:4: note: in definition of macro '__compiletime_assert' prefix ## suffix(); \ ^~~~~~ include/linux/compiler.h:350:2: note: in expansion of macro '_compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__) ^~~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert' #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) ^~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG' BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) ^~~~~~~~~~~~~~~~ include/linux/nospec.h:56:2: note: in expansion of macro 'BUILD_BUG_ON' BUILD_BUG_ON(sizeof(_s) > sizeof(long)); \ ^~~~~~~~~~~~ >> drivers/vhost/vhost.c:2076:5: note: in expansion of macro 'array_index_nospec' array_index_nospec(addr - node->start, ^~~~~~~~~~~~~~~~~~ -- In file included from include/linux/kernel.h:11:0, from include/linux/list.h:9, from include/linux/wait.h:7, from include/linux/eventfd.h:13, from drivers//vhost/vhost.c:13: drivers//vhost/vhost.c: In function 'translate_desc': >> include/linux/compiler.h:350:38: error: call to '__compiletime_assert_2077' declared with attribute error: BUILD_BUG_ON failed: sizeof(_s) > sizeof(long) _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__) ^ include/linux/compiler.h:331:4: note: in definition of macro '__compiletime_assert' prefix ## suffix(); \ ^~~~~~ include/linux/compiler.h:350:2: note: in expansion of macro '_compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__) ^~~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert' #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) ^~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG' BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) ^~~~~~~~~~~~~~~~ >> include/linux/nospec.h:55:2: note: in expansion of macro 'BUILD_BUG_ON' BUILD_BUG_ON(sizeof(_i) > sizeof(long)); \ ^~~~~~~~~~~~ drivers//vhost/vhost.c:2076:5: note: in expansion of macro 'array_index_nospec' array_index_nospec(addr - node->start, ^~~~~~~~~~~~~~~~~~ >> include/linux/compiler.h:350:38: error: call to '__compiletime_assert_2077' declared with attribute error: BUILD_BUG_ON failed: sizeof(_s) > sizeof(long) _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__) ^ include/linux/compiler.h:331:4: note: in definition of macro '__compiletime_assert' prefix ## suffix(); \ ^~~~~~ include/linux/compiler.h:350:2: note: in expansion of macro '_compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__) ^~~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert' #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) ^~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG' BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) ^~~~~~~~~~~~~~~~ include/linux/nospec.h:56:2: note: in expansion of macro 'BUILD_BUG_ON' BUILD_BUG_ON(sizeof(_s) > sizeof(long)); \ ^~~~~~~~~~~~ drivers//vhost/vhost.c:2076:5: note: in expansion of macro 'array_index_nospec' array_index_nospec(addr - node->start, ^~~~~~~~~~~~~~~~~~ vim +/array_index_nospec +2076 drivers/vhost/vhost.c 2039 2040 static int translate_desc(struct vhost_virtqueue *vq, u64 addr, u32 len, 2041 struct iovec iov[], int iov_size, int access) 2042 { 2043 const struct vhost_umem_node *node; 2044 struct vhost_dev *dev = vq->dev; 2045 struct vhost_umem *umem = dev->iotlb ? dev->iotlb : dev->umem; 2046 struct iovec *_iov; 2047 u64 s = 0; 2048 int ret = 0; 2049 2050 while ((u64)len > s) { 2051 u64 size; 2052 if (unlikely(ret >= iov_size)) { 2053 ret = -ENOBUFS; 2054 break; 2055 } 2056 2057 node = vhost_umem_interval_tree_iter_first(&umem->umem_tree, 2058 addr, addr + len - 1); 2059 if (node == NULL || node->start > addr) { 2060 if (umem != dev->iotlb) { 2061 ret = -EFAULT; 2062 break; 2063 } 2064 ret = -EAGAIN; 2065 break; 2066 } else if (!(node->perm & access)) { 2067 ret = -EPERM; 2068 break; 2069 } 2070 2071 _iov = iov + ret; 2072 size = node->size - addr + node->start; 2073 _iov->iov_len = min((u64)len - s, size); 2074 _iov->iov_base = (void __user *)(unsigned long) 2075 (node->userspace_addr + > 2076 array_index_nospec(addr - node->start, 2077 node->size)); 2078 s += size; 2079 addr += size; 2080 ++ret; 2081 } 2082 2083 if (ret == -EAGAIN) 2084 vhost_iotlb_miss(vq, addr, access); 2085 return ret; 2086 } 2087 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
Attachment:
.config.gz
Description: application/gzip
