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-rw-r--r--fs/stat.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/fs/stat.c b/fs/stat.c
index fa0be59340cc..7c8701361018 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -15,6 +15,7 @@
#include <linux/cred.h>
#include <linux/syscalls.h>
#include <linux/pagemap.h>
+#include <linux/compat.h>
#include <linux/uaccess.h>
#include <asm/unistd.h>
@@ -584,6 +585,91 @@ SYSCALL_DEFINE5(statx,
return statx_set_result(&stat, buffer);
}
+#ifdef CONFIG_COMPAT
+static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
+{
+ struct compat_stat tmp;
+
+ if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
+ return -EOVERFLOW;
+
+ memset(&tmp, 0, sizeof(tmp));
+ tmp.st_dev = old_encode_dev(stat->dev);
+ tmp.st_ino = stat->ino;
+ if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
+ return -EOVERFLOW;
+ tmp.st_mode = stat->mode;
+ tmp.st_nlink = stat->nlink;
+ if (tmp.st_nlink != stat->nlink)
+ return -EOVERFLOW;
+ SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
+ SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
+ tmp.st_rdev = old_encode_dev(stat->rdev);
+ if ((u64) stat->size > MAX_NON_LFS)
+ return -EOVERFLOW;
+ tmp.st_size = stat->size;
+ tmp.st_atime = stat->atime.tv_sec;
+ tmp.st_atime_nsec = stat->atime.tv_nsec;
+ tmp.st_mtime = stat->mtime.tv_sec;
+ tmp.st_mtime_nsec = stat->mtime.tv_nsec;
+ tmp.st_ctime = stat->ctime.tv_sec;
+ tmp.st_ctime_nsec = stat->ctime.tv_nsec;
+ tmp.st_blocks = stat->blocks;
+ tmp.st_blksize = stat->blksize;
+ return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
+}
+
+COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename,
+ struct compat_stat __user *, statbuf)
+{
+ struct kstat stat;
+ int error;
+
+ error = vfs_stat(filename, &stat);
+ if (error)
+ return error;
+ return cp_compat_stat(&stat, statbuf);
+}
+
+COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename,
+ struct compat_stat __user *, statbuf)
+{
+ struct kstat stat;
+ int error;
+
+ error = vfs_lstat(filename, &stat);
+ if (error)
+ return error;
+ return cp_compat_stat(&stat, statbuf);
+}
+
+#ifndef __ARCH_WANT_STAT64
+COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd,
+ const char __user *, filename,
+ struct compat_stat __user *, statbuf, int, flag)
+{
+ struct kstat stat;
+ int error;
+
+ error = vfs_fstatat(dfd, filename, &stat, flag);
+ if (error)
+ return error;
+ return cp_compat_stat(&stat, statbuf);
+}
+#endif
+
+COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd,
+ struct compat_stat __user *, statbuf)
+{
+ struct kstat stat;
+ int error = vfs_fstat(fd, &stat);
+
+ if (!error)
+ error = cp_compat_stat(&stat, statbuf);
+ return error;
+}
+#endif
+
/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
void __inode_add_bytes(struct inode *inode, loff_t bytes)
{