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fuse: Add initial support for fs-verity

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This adds support for the FS_IOC_ENABLE_VERITY and FS_IOC_MEASURE_VERITY
ioctls. The FS_IOC_READ_VERITY_METADATA is missing but from the
documentation, "This is a fairly specialized use case, and most fs-verity
users won’t need this ioctl."

Signed-off-by: Richard Fung <richardfung@google.com>
Acked-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Richard Fung 2024-04-16 00:16:39 +00:00 committed by Miklos Szeredi
parent 413e8f014c
commit 9fe2a036a2
1 changed files with 60 additions and 0 deletions
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60
fs/fuse/ioctl.c
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@ -8,6 +8,7 @@
#include <linux/uio.h>
#include <linux/compat.h>
#include <linux/fileattr.h>
#include <linux/fsverity.h>
static ssize_t fuse_send_ioctl(struct fuse_mount *fm, struct fuse_args *args,
struct fuse_ioctl_out *outarg)
@ -117,6 +118,53 @@ static int fuse_copy_ioctl_iovec(struct fuse_conn *fc, struct iovec *dst,
return 0;
}
/* For fs-verity, determine iov lengths from input */
static int fuse_setup_measure_verity(unsigned long arg, struct iovec *iov)
{
__u16 digest_size;
struct fsverity_digest __user *uarg = (void __user *)arg;
if (copy_from_user(&digest_size, &uarg->digest_size, sizeof(digest_size)))
return -EFAULT;
if (digest_size > SIZE_MAX - sizeof(struct fsverity_digest))
return -EINVAL;
iov->iov_len = sizeof(struct fsverity_digest) + digest_size;
return 0;
}
static int fuse_setup_enable_verity(unsigned long arg, struct iovec *iov,
unsigned int *in_iovs)
{
struct fsverity_enable_arg enable;
struct fsverity_enable_arg __user *uarg = (void __user *)arg;
const __u32 max_buffer_len = FUSE_MAX_MAX_PAGES * PAGE_SIZE;
if (copy_from_user(&enable, uarg, sizeof(enable)))
return -EFAULT;
if (enable.salt_size > max_buffer_len || enable.sig_size > max_buffer_len)
return -ENOMEM;
if (enable.salt_size > 0) {
iov++;
(*in_iovs)++;
iov->iov_base = u64_to_user_ptr(enable.salt_ptr);
iov->iov_len = enable.salt_size;
}
if (enable.sig_size > 0) {
iov++;
(*in_iovs)++;
iov->iov_base = u64_to_user_ptr(enable.sig_ptr);
iov->iov_len = enable.sig_size;
}
return 0;
}
/*
* For ioctls, there is no generic way to determine how much memory
@ -227,6 +275,18 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
out_iov = iov;
out_iovs = 1;
}
err = 0;
switch (cmd) {
case FS_IOC_MEASURE_VERITY:
err = fuse_setup_measure_verity(arg, iov);
break;
case FS_IOC_ENABLE_VERITY:
err = fuse_setup_enable_verity(arg, iov, &in_iovs);
break;
}
if (err)
goto out;
}
retry: