Re: [PATCH] iov_iter: take an unsigned long segment count in import_iovec()

[Christian Brauner]

On Mon, 26 Oct 2026 19:06:18 +0100, Andrea Parri wrote:
> readv(), writev() and their positional variants, process_vm_readv(),
> process_vm_writev(), vmsplice(), process_madvise(), vectored aio and
> the btrfs encoded I/O ioctls all take a full-width segment count, and
> all of them hand it to import_iovec() or __import_iovec().  Those take
> an unsigned int count, so on 64-bit kernels the upper 32 bits are
> dropped before iovec_from_user() checks the count against UIO_MAXIOV.
> 
> [...]

Applied to the vfs.fixes branch of the vfs/vfs.git tree.
Patches in the vfs.fixes branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.fixes

[1/1] iov_iter: take an unsigned long segment count in import_iovec()
      https://git.kernel.org/vfs/vfs/c/7a15349d271b