diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2026-08-17 09:15:52 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2026-08-17 09:15:52 -0700 |
| commit | cd051cfe1e35a471fc2cdf6d32fae6ee23305ecb (patch) | |
| tree | b54ff317457566bb10bd8e2e8345a440907ef7da /tools/include/uapi | |
| parent | d31a688a49a82a48e0434aee9d851e094270a6ee (diff) | |
| parent | 1d38e750a389e919c1608dbc61cd5c93cd4915dc (diff) | |
Merge tag 'vfs-7.3-rc1.failfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull failfs filesystem from Christian Brauner:
"Add failfs and expose a FD_FAILFS_ROOT sentinel.
This allows userspace to shed their filesystem state completely. A
process with its root or working directory in failfs must anchor every
path lookup at an explicit file descriptor. Absolute paths, absolute
symlinks and AT_FDCWD-relative lookups simply fail.
Failfs is the counterpart to nullfs. nullfs says adds a permanently
empty, immutable directory whose lookups fail with ENOENT but which
can be opened, read, stat'd and mounted upon. Failfs on the other hand
fails every operation. The root cannot be opened at all. A single
instance is mounted during early boot via kern_mount(), which makes it
logically distinct from every mount namespace.
This is accompanied by a new fchroot() system call which makes
chrooting via a file descriptor a first class concept. It's possible
to chroot into failfs as an unprivileged user provided the task has no
new privileges set"
* tag 'vfs-7.3-rc1.failfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
Documentation: add failfs documentation
selftests/filesystems: add failfs selftests
arch: hookup fchroot() system call
fs: support FD_FAILFS_ROOT in fchroot()
fs: add fchroot()
fs: support FD_FAILFS_ROOT in fchdir()
fs: add failfs
Diffstat (limited to 'tools/include/uapi')
| -rw-r--r-- | tools/include/uapi/asm-generic/unistd.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/tools/include/uapi/asm-generic/unistd.h b/tools/include/uapi/asm-generic/unistd.h index a627acc8fb5f..5b7e77a7c736 100644 --- a/tools/include/uapi/asm-generic/unistd.h +++ b/tools/include/uapi/asm-generic/unistd.h @@ -863,8 +863,12 @@ __SYSCALL(__NR_listns, sys_listns) #define __NR_rseq_slice_yield 471 __SYSCALL(__NR_rseq_slice_yield, sys_rseq_slice_yield) +/* fs/open.c */ +#define __NR_fchroot 472 +__SYSCALL(__NR_fchroot, sys_fchroot) + #undef __NR_syscalls -#define __NR_syscalls 472 +#define __NR_syscalls 473 /* * 32 bit systems traditionally used different |