pm24.git/fs/hostfs, branch master

hostfs: Fix the NULL vs IS_ERR() bug for __filemap_get_folio()

2024-11-15T19:55:32Z

The __filemap_get_folio() function returns error pointers. It never returns NULL. So use IS_ERR() to check it. Fixes: 1da86618bdce ("fs: Convert aops->write_begin to take a folio") Signed-off-by: ZhangPeng Acked-by: Johannes Berg Signed-off-by: Richard Weinberger

hostfs: Do not propagate hostfs parameter to kernel

2024-10-23T07:52:49Z

This parameter is UML specific and is unknown to kernel. It should not be propagated to kernel, otherwise it will be passed to user space as an environment option by kernel with a warning like: Unknown kernel command line parameters "hostfs=/foo", will be passed to user space. Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20241011040441.1586345-7-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg

fs: Convert aops->write_begin to take a folio

2024-08-07T09:33:21Z

Convert all callers from working on a page to working on one page of a folio (support for working on an entire folio can come later). Removes a lot of folio->page->folio conversions. Reviewed-by: Josef Bacik Signed-off-by: Matthew Wilcox (Oracle) Signed-off-by: Christian Brauner

fs: Convert aops->write_end to take a folio

2024-08-07T09:32:02Z

Most callers have a folio, and most implementations operate on a folio, so remove the conversion from folio->page->folio to fit through this interface. Reviewed-by: Josef Bacik Signed-off-by: Matthew Wilcox (Oracle) Signed-off-by: Christian Brauner

hostfs: Convert hostfs_write_end() to use a folio

2024-08-07T09:32:01Z

Convert the passed page to a folio and operate on that. Replaces four calls to compound_head() with one. Reviewed-by: Josef Bacik Signed-off-by: Matthew Wilcox (Oracle) Signed-off-by: Christian Brauner

Merge tag 'vfs-6.11-rc1.fixes.3' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

2024-07-27T22:11:59Z

Pull vfs fixes from Christian Brauner: "This contains two fixes for this merge window: VFS: - I noticed that it is possible for a privileged user to mount most filesystems with a non-initial user namespace in sb->s_user_ns. When fsopen() is called in a non-init namespace the caller's namespace is recorded in fs_context->user_ns. If the returned file descriptor is then passed to a process privileged in init_user_ns, that process can call fsconfig(fd_fs, FSCONFIG_CMD_CREATE*), creating a new superblock with sb->s_user_ns set to the namespace of the process which called fsopen(). This is problematic as only filesystems that raise FS_USERNS_MOUNT are known to be able to support a non-initial s_user_ns. Others may suffer security issues, on-disk corruption or outright crash the kernel. Prevent that by restricting such delegation to filesystems that allow FS_USERNS_MOUNT. Note, that this delegation requires a privileged process to actually create the superblock so either the privileged process is cooperaing or someone must have tricked a privileged process into operating on a fscontext file descriptor whose origin it doesn't know (a stupid idea). The bug dates back to about 5 years afaict. Misc: - Fix hostfs parsing when the mount request comes in via the legacy mount api. In the legacy mount api hostfs allows to specify the host directory mount without any key. Restore that behavior" * tag 'vfs-6.11-rc1.fixes.3' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: hostfs: fix the host directory parse when mounting. fs: don't allow non-init s_user_ns for filesystems without FS_USERNS_MOUNT

hostfs: fix the host directory parse when mounting.

2024-07-27T07:56:33Z

hostfs not keep the host directory when mounting. When the host directory is none (default), fc->source is used as the host root directory, and this is wrong. Here we use `parse_monolithic` to handle the old mount path for parsing the root directory. For new mount path, The `parse_param` is used for the host directory parse. Reported-and-tested-by: Maciej Żenczykowski Fixes: cd140ce9f611 ("hostfs: convert hostfs to use the new mount API") Link: https://lore.kernel.org/all/CANP3RGceNzwdb7w=vPf5=7BCid5HVQDmz1K5kC9JG42+HVAh_g@mail.gmail.com/ Cc: Christian Brauner Signed-off-by: Hongbo Li Link: https://lore.kernel.org/r/20240725065130.1821964-1-lihongbo22@huawei.com [brauner: minor fixes] Signed-off-by: Christian Brauner

Merge tag 'uml-for-linus-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux

2024-07-25T19:33:08Z

Pull UML updates from Richard Weinberger: - Support for preemption - i386 Rust support - Huge cleanup by Benjamin Berg - UBSAN support - Removal of dead code * tag 'uml-for-linus-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux: (41 commits) um: vector: always reset vp->opened um: vector: remove vp->lock um: register power-off handler um: line: always fill *error_out in setup_one_line() um: remove pcap driver from documentation um: Enable preemption in UML um: refactor TLB update handling um: simplify and consolidate TLB updates um: remove force_flush_all from fork_handler um: Do not flush MM in flush_thread um: Delay flushing syscalls until the thread is restarted um: remove copy_context_skas0 um: remove LDT support um: compress memory related stub syscalls while adding them um: Rework syscall handling um: Add generic stub_syscall6 function um: Create signal stack memory assignment in stub_data um: Remove stub-data.h include from common-offsets.h um: time-travel: fix signal blocking race/hang um: time-travel: remove time_exit() ...

hostfs: fix folio conversion

2024-07-24T16:25:15Z

Commit e3ec0fe944d2 ("hostfs: Convert hostfs_read_folio() to use a folio") simplified hostfs_read_folio(), but in the process of converting to using folios natively also mis-used the folio_zero_tail() function due to the very confusing API of that function. Very arguably it's folio_zero_tail() API itself that is buggy, since it would make more sense (and the documentation kind of implies) that the third argument would be the pointer to the beginning of the folio buffer. But no, the third argument to folio_zero_tail() is where we should start zeroing the tail (even if we already also pass in the offset separately as the second argument). So fix the hostfs caller, and we can leave any folio_zero_tail() sanity cleanup for later. Reported-and-tested-by: Maciej Żenczykowski Fixes: e3ec0fe944d2 ("hostfs: Convert hostfs_read_folio() to use a folio") Link: https://lore.kernel.org/all/CANP3RGceNzwdb7w=vPf5=7BCid5HVQDmz1K5kC9JG42+HVAh_g@mail.gmail.com/ Cc: Matthew Wilcox Cc: Christian Brauner Signed-off-by: Linus Torvalds

Merge tag 'vfs-6.11.mount.api' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

2024-07-15T18:31:32Z

Pull vfs mount API updates from Christian Brauner: - Add a generic helper to parse uid and gid mount options. Currently we open-code the same logic in various filesystems which is error prone, especially since the verification of uid and gid mount options is a sensitive operation in the face of idmappings. Add a generic helper and convert all filesystems over to it. Make sure that filesystems that are mountable in unprivileged containers verify that the specified uid and gid can be represented in the owning namespace of the filesystem. - Convert hostfs to the new mount api. * tag 'vfs-6.11.mount.api' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: fuse: Convert to new uid/gid option parsing helpers fuse: verify {g,u}id mount options correctly fat: Convert to new uid/gid option parsing helpers fat: Convert to new mount api fat: move debug into fat_mount_options vboxsf: Convert to new uid/gid option parsing helpers tracefs: Convert to new uid/gid option parsing helpers smb: client: Convert to new uid/gid option parsing helpers tmpfs: Convert to new uid/gid option parsing helpers ntfs3: Convert to new uid/gid option parsing helpers isofs: Convert to new uid/gid option parsing helpers hugetlbfs: Convert to new uid/gid option parsing helpers ext4: Convert to new uid/gid option parsing helpers exfat: Convert to new uid/gid option parsing helpers efivarfs: Convert to new uid/gid option parsing helpers debugfs: Convert to new uid/gid option parsing helpers autofs: Convert to new uid/gid option parsing helpers fs_parse: add uid & gid option option parsing helpers hostfs: Add const qualifier to host_root in hostfs_fill_super() hostfs: convert hostfs to use the new mount API