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Date: Wed, 11 Sep 2019 19:38:18 +0800
From: kbuild test robot <lkp@...el.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: kbuild-all@...org, kvm@...r.kernel.org,
virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: [vhost:linux-next 8/9] drivers/vhost/vhost.c:2076:5: note: in
expansion of macro 'array_index_nospec'
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@...el.com>
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
---
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