From fa0d6d945e5ce96cff14b114eec7527f13d7f23a Mon Sep 17 00:00:00 2001 From: Christian Brauner Date: Fri, 24 Jul 2026 15:41:17 +0200 Subject: fs: add failfs nullfs provides a permanently empty and immutable directory. Lookups fail with ENOENT. The directory can be opened, read, stat, mounted upon. It behaves like nothing is there. Add its counterpart failfs where the semantics are not "there is nothing here" but "nothing is supported here". Every operation that reaches the filesystem fails with EOPNOTSUPP. Even statfs()/fstatfs() fail so the filesystem cannot be discovered through an fd to it. EOPNOTSUPP rather than a permission errno keeps that coherent. There is no permission model in which anything could ever be allowed and EACCES or EPERM would merely suggest that different credentials might succeed while EIO would suggest corruption. It also makes hitting the failfs boundary mostly quite dinstinguishable. A task anchoring its lookups at real directory file descriptors may be able to tell a failfs refusal from an ordinary permission failure. I wouldn't go so far as guaranteeing that but it should mostly work. No path lookup can open the root, not even with O_PATH. It is never reached by a lookup in a parent directory. The only way to a path-walk terminal at the root is a jump through a /proc//{root,cwd} magic link or by mountpoint traversal. The root also refuses ->d_weak_revalidate() which the VFS calls for jumped terminals. That covers the jump-based references too: an O_PATH open is refused, name_to_handle_at() cannot encode it into a file handle, and following a magic link into it fails. A plain readlink() of such a link still works and shows "failfs:/". There is a single instance of failfs mounted during early boot via kern_mount() making it logically distinct from every mount namespace. Since the mount is a member of no mount namespace mounting onto it fails. So nothing can ever be mounted on top of it. It cannot be cloned via OPEN_TREE_CLONE and it does not show up in statmount()/listmount() or /proc//mountinfo. The filesystem is not registered so it is not visible in /proc/filesystems and cannot be mounted from userspace. This lets tasks shed their filesystem state completely. A process with its root directory or working directory in failfs must anchor every path lookup at an explicit file descriptor or is doomed to fail any lookup. Absolute paths, absolute symlinks, and AT_FDCWD-relative lookups simply fail. Followup patches will expose it via a new FD_FAILFS_ROOT file descriptor sentinel understood by fchdir() and the new fchroot() system call. Link: https://patch.msgid.link/20260724-work-failfs-v2-1-485dabbae185@kernel.org Signed-off-by: Christian Brauner (Amutable) --- include/uapi/linux/magic.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/uapi') diff --git a/include/uapi/linux/magic.h b/include/uapi/linux/magic.h index 4f2da935a76c..fd5f0e95648e 100644 --- a/include/uapi/linux/magic.h +++ b/include/uapi/linux/magic.h @@ -105,5 +105,6 @@ #define PID_FS_MAGIC 0x50494446 /* "PIDF" */ #define GUEST_MEMFD_MAGIC 0x474d454d /* "GMEM" */ #define NULL_FS_MAGIC 0x4E554C4C /* "NULL" */ +#define FAIL_FS_MAGIC 0x4641494C /* "FAIL" */ #endif /* __LINUX_MAGIC_H__ */ -- cgit From cdf930a00949af72fbe9a22da2a8efa77981baa7 Mon Sep 17 00:00:00 2001 From: Christian Brauner Date: Fri, 24 Jul 2026 15:41:18 +0200 Subject: fs: support FD_FAILFS_ROOT in fchdir() Add a new file descriptor sentinel FD_FAILFS_ROOT following FD_PIDFS_ROOT and FD_NSFS_ROOT and teach fchdir() to accept it. A process calling fchdir(FD_FAILFS_ROOT) moves its working directory into failfs. Every AT_FDCWD-relative lookup afterwards fails with EOPNOTSUPP including "." and ".." and getcwd() reports the working directory as unreachable from the process root by returning a path prefixed with "(unreachable)". Lookups relative to explicit directory file descriptors are unaffected. The sentinel is the only way in. No privilege or gating is required. Setting the working directory to a directory in which every operation fails grants nothing and loses nothing that closing file descriptors couldn't lose. An unlinked working directory behaves the same way today modulo errno. The working directory also plays no role in confining ".." resolution so no boundary is weakened. Link: https://patch.msgid.link/20260724-work-failfs-v2-2-485dabbae185@kernel.org Signed-off-by: Christian Brauner (Amutable) --- fs/failfs.c | 11 +++++++++++ fs/internal.h | 1 + fs/open.c | 5 ++++- include/uapi/linux/fcntl.h | 1 + 4 files changed, 17 insertions(+), 1 deletion(-) (limited to 'include/uapi') diff --git a/fs/failfs.c b/fs/failfs.c index d0ca1fc6c459..66a36da3d236 100644 --- a/fs/failfs.c +++ b/fs/failfs.c @@ -3,6 +3,7 @@ #include #include #include +#include #include #include @@ -135,6 +136,16 @@ static int failfs_init_fs_context(struct fs_context *fc) return 0; } +int failfs_current_chdir(void) +{ + struct path path; + + failfs_get_root(&path); + set_fs_pwd(current->fs, &path); + path_put(&path); + return 0; +} + static struct file_system_type failfs_fs_type = { .name = "failfs", .init_fs_context = failfs_init_fs_context, diff --git a/fs/internal.h b/fs/internal.h index ce7f12c5a65b..67aa0444351b 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -365,3 +365,4 @@ void nsfs_get_root(struct path *path); void failfs_get_root(struct path *path); void __init failfs_init(void); bool failfs_mnt(const struct vfsmount *mnt); +int failfs_current_chdir(void); diff --git a/fs/open.c b/fs/open.c index 408925d7bd0b..56b6032d4d81 100644 --- a/fs/open.c +++ b/fs/open.c @@ -570,9 +570,12 @@ retry: SYSCALL_DEFINE1(fchdir, unsigned int, fd) { - CLASS(fd_raw, f)(fd); int error; + if ((int)fd == FD_FAILFS_ROOT) + return failfs_current_chdir(); + + CLASS(fd_raw, f)(fd); if (fd_empty(f)) return -EBADF; diff --git a/include/uapi/linux/fcntl.h b/include/uapi/linux/fcntl.h index aadfbf6e0cb3..e43e3de3e9ee 100644 --- a/include/uapi/linux/fcntl.h +++ b/include/uapi/linux/fcntl.h @@ -124,6 +124,7 @@ struct delegation { #define FD_PIDFS_ROOT -10002 /* Root of the pidfs filesystem */ #define FD_NSFS_ROOT -10003 /* Root of the nsfs filesystem */ +#define FD_FAILFS_ROOT -10004 /* Root of the failfs filesystem */ #define FD_INVALID -10009 /* Invalid file descriptor: -10000 - EBADF = -10009 */ /* Generic flags for the *at(2) family of syscalls. */ -- cgit From 79d27fd718545db4731691e0a77e51d27dc1a41e Mon Sep 17 00:00:00 2001 From: Christian Brauner Date: Fri, 24 Jul 2026 15:41:21 +0200 Subject: arch: hookup fchroot() system call Wire up the fchroot() system call as number 472 on (nearly) all architectures and sync the mirrored copies of the syscall tables and the asm-generic unistd.h under tools/. Link: https://patch.msgid.link/20260724-work-failfs-v2-5-485dabbae185@kernel.org Signed-off-by: Christian Brauner (Amutable) --- arch/alpha/kernel/syscalls/syscall.tbl | 1 + arch/arm/tools/syscall.tbl | 1 + arch/arm64/tools/syscall_32.tbl | 1 + arch/m68k/kernel/syscalls/syscall.tbl | 1 + arch/microblaze/kernel/syscalls/syscall.tbl | 1 + arch/mips/kernel/syscalls/syscall_n32.tbl | 1 + arch/mips/kernel/syscalls/syscall_n64.tbl | 1 + arch/mips/kernel/syscalls/syscall_o32.tbl | 1 + arch/parisc/kernel/syscalls/syscall.tbl | 1 + arch/powerpc/kernel/syscalls/syscall.tbl | 1 + arch/s390/kernel/syscalls/syscall.tbl | 1 + arch/sh/kernel/syscalls/syscall.tbl | 1 + arch/sparc/kernel/syscalls/syscall.tbl | 1 + arch/x86/entry/syscalls/syscall_32.tbl | 1 + arch/x86/entry/syscalls/syscall_64.tbl | 1 + arch/xtensa/kernel/syscalls/syscall.tbl | 1 + include/uapi/asm-generic/unistd.h | 6 +++++- scripts/syscall.tbl | 1 + tools/include/uapi/asm-generic/unistd.h | 6 +++++- tools/perf/arch/arm/entry/syscalls/syscall.tbl | 1 + tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl | 1 + tools/perf/arch/powerpc/entry/syscalls/syscall.tbl | 1 + tools/perf/arch/s390/entry/syscalls/syscall.tbl | 1 + tools/perf/arch/sh/entry/syscalls/syscall.tbl | 1 + tools/perf/arch/sparc/entry/syscalls/syscall.tbl | 1 + tools/perf/arch/x86/entry/syscalls/syscall_32.tbl | 1 + tools/perf/arch/x86/entry/syscalls/syscall_64.tbl | 1 + tools/perf/arch/xtensa/entry/syscalls/syscall.tbl | 1 + tools/scripts/syscall.tbl | 1 + 29 files changed, 37 insertions(+), 2 deletions(-) (limited to 'include/uapi') diff --git a/arch/alpha/kernel/syscalls/syscall.tbl b/arch/alpha/kernel/syscalls/syscall.tbl index f31b7afffc34..52e3538cc7df 100644 --- a/arch/alpha/kernel/syscalls/syscall.tbl +++ b/arch/alpha/kernel/syscalls/syscall.tbl @@ -511,3 +511,4 @@ 579 common file_setattr sys_file_setattr 580 common listns sys_listns 581 common rseq_slice_yield sys_rseq_slice_yield +582 common fchroot sys_fchroot diff --git a/arch/arm/tools/syscall.tbl b/arch/arm/tools/syscall.tbl index 94351e22bfcf..55717ed32c27 100644 --- a/arch/arm/tools/syscall.tbl +++ b/arch/arm/tools/syscall.tbl @@ -486,3 +486,4 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 common rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot diff --git a/arch/arm64/tools/syscall_32.tbl b/arch/arm64/tools/syscall_32.tbl index 62d93d88e0fe..df2d1d82fb3c 100644 --- a/arch/arm64/tools/syscall_32.tbl +++ b/arch/arm64/tools/syscall_32.tbl @@ -483,3 +483,4 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 common rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot diff --git a/arch/m68k/kernel/syscalls/syscall.tbl b/arch/m68k/kernel/syscalls/syscall.tbl index 248934257101..ba7a4d8903d0 100644 --- a/arch/m68k/kernel/syscalls/syscall.tbl +++ b/arch/m68k/kernel/syscalls/syscall.tbl @@ -471,3 +471,4 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 common rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot diff --git a/arch/microblaze/kernel/syscalls/syscall.tbl b/arch/microblaze/kernel/syscalls/syscall.tbl index 223d26303627..c55a5c96f49b 100644 --- a/arch/microblaze/kernel/syscalls/syscall.tbl +++ b/arch/microblaze/kernel/syscalls/syscall.tbl @@ -477,3 +477,4 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 common rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl index 7430714e2b8f..9ae88e4eac61 100644 --- a/arch/mips/kernel/syscalls/syscall_n32.tbl +++ b/arch/mips/kernel/syscalls/syscall_n32.tbl @@ -410,3 +410,4 @@ 469 n32 file_setattr sys_file_setattr 470 n32 listns sys_listns 471 n32 rseq_slice_yield sys_rseq_slice_yield +472 n32 fchroot sys_fchroot diff --git a/arch/mips/kernel/syscalls/syscall_n64.tbl b/arch/mips/kernel/syscalls/syscall_n64.tbl index 630aab9e5425..83dc93a0712f 100644 --- a/arch/mips/kernel/syscalls/syscall_n64.tbl +++ b/arch/mips/kernel/syscalls/syscall_n64.tbl @@ -386,3 +386,4 @@ 469 n64 file_setattr sys_file_setattr 470 n64 listns sys_listns 471 n64 rseq_slice_yield sys_rseq_slice_yield +472 n64 fchroot sys_fchroot diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl index 128653112284..9c62429c9b7b 100644 --- a/arch/mips/kernel/syscalls/syscall_o32.tbl +++ b/arch/mips/kernel/syscalls/syscall_o32.tbl @@ -459,3 +459,4 @@ 469 o32 file_setattr sys_file_setattr 470 o32 listns sys_listns 471 o32 rseq_slice_yield sys_rseq_slice_yield +472 o32 fchroot sys_fchroot diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl index c6331dad9461..88adc4016cce 100644 --- a/arch/parisc/kernel/syscalls/syscall.tbl +++ b/arch/parisc/kernel/syscalls/syscall.tbl @@ -470,3 +470,4 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 common rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl index 4fcc7c58a105..cfbb70039ff0 100644 --- a/arch/powerpc/kernel/syscalls/syscall.tbl +++ b/arch/powerpc/kernel/syscalls/syscall.tbl @@ -562,3 +562,4 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 nospu rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl index 09a7ef04d979..1b45e68a217b 100644 --- a/arch/s390/kernel/syscalls/syscall.tbl +++ b/arch/s390/kernel/syscalls/syscall.tbl @@ -398,3 +398,4 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 common rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot diff --git a/arch/sh/kernel/syscalls/syscall.tbl b/arch/sh/kernel/syscalls/syscall.tbl index 70b315cbe710..ace068dff0de 100644 --- a/arch/sh/kernel/syscalls/syscall.tbl +++ b/arch/sh/kernel/syscalls/syscall.tbl @@ -475,3 +475,4 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 common rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl index 7e71bf7fcd14..5b9fe0e8140f 100644 --- a/arch/sparc/kernel/syscalls/syscall.tbl +++ b/arch/sparc/kernel/syscalls/syscall.tbl @@ -517,3 +517,4 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 common rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl index f832ebd2d79b..2c172ef48dfd 100644 --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -477,3 +477,4 @@ 469 i386 file_setattr sys_file_setattr 470 i386 listns sys_listns 471 i386 rseq_slice_yield sys_rseq_slice_yield +472 i386 fchroot sys_fchroot diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl index 524155d655da..d5b6045b0090 100644 --- a/arch/x86/entry/syscalls/syscall_64.tbl +++ b/arch/x86/entry/syscalls/syscall_64.tbl @@ -396,6 +396,7 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 common rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot # # Due to a historical design error, certain syscalls are numbered differently diff --git a/arch/xtensa/kernel/syscalls/syscall.tbl b/arch/xtensa/kernel/syscalls/syscall.tbl index a9bca4e484de..d354bb231796 100644 --- a/arch/xtensa/kernel/syscalls/syscall.tbl +++ b/arch/xtensa/kernel/syscalls/syscall.tbl @@ -442,3 +442,4 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 common rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h index a627acc8fb5f..5b7e77a7c736 100644 --- a/include/uapi/asm-generic/unistd.h +++ b/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 diff --git a/scripts/syscall.tbl b/scripts/syscall.tbl index 7a42b32b6577..0ab531605120 100644 --- a/scripts/syscall.tbl +++ b/scripts/syscall.tbl @@ -412,3 +412,4 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 common rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot 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 diff --git a/tools/perf/arch/arm/entry/syscalls/syscall.tbl b/tools/perf/arch/arm/entry/syscalls/syscall.tbl index 94351e22bfcf..55717ed32c27 100644 --- a/tools/perf/arch/arm/entry/syscalls/syscall.tbl +++ b/tools/perf/arch/arm/entry/syscalls/syscall.tbl @@ -486,3 +486,4 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 common rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot diff --git a/tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl b/tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl index 630aab9e5425..83dc93a0712f 100644 --- a/tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl +++ b/tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl @@ -386,3 +386,4 @@ 469 n64 file_setattr sys_file_setattr 470 n64 listns sys_listns 471 n64 rseq_slice_yield sys_rseq_slice_yield +472 n64 fchroot sys_fchroot diff --git a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl index 4fcc7c58a105..cfbb70039ff0 100644 --- a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl +++ b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl @@ -562,3 +562,4 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 nospu rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot diff --git a/tools/perf/arch/s390/entry/syscalls/syscall.tbl b/tools/perf/arch/s390/entry/syscalls/syscall.tbl index 09a7ef04d979..1b45e68a217b 100644 --- a/tools/perf/arch/s390/entry/syscalls/syscall.tbl +++ b/tools/perf/arch/s390/entry/syscalls/syscall.tbl @@ -398,3 +398,4 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 common rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot diff --git a/tools/perf/arch/sh/entry/syscalls/syscall.tbl b/tools/perf/arch/sh/entry/syscalls/syscall.tbl index 70b315cbe710..ace068dff0de 100644 --- a/tools/perf/arch/sh/entry/syscalls/syscall.tbl +++ b/tools/perf/arch/sh/entry/syscalls/syscall.tbl @@ -475,3 +475,4 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 common rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot diff --git a/tools/perf/arch/sparc/entry/syscalls/syscall.tbl b/tools/perf/arch/sparc/entry/syscalls/syscall.tbl index 7e71bf7fcd14..5b9fe0e8140f 100644 --- a/tools/perf/arch/sparc/entry/syscalls/syscall.tbl +++ b/tools/perf/arch/sparc/entry/syscalls/syscall.tbl @@ -517,3 +517,4 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 common rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot diff --git a/tools/perf/arch/x86/entry/syscalls/syscall_32.tbl b/tools/perf/arch/x86/entry/syscalls/syscall_32.tbl index f832ebd2d79b..2c172ef48dfd 100644 --- a/tools/perf/arch/x86/entry/syscalls/syscall_32.tbl +++ b/tools/perf/arch/x86/entry/syscalls/syscall_32.tbl @@ -477,3 +477,4 @@ 469 i386 file_setattr sys_file_setattr 470 i386 listns sys_listns 471 i386 rseq_slice_yield sys_rseq_slice_yield +472 i386 fchroot sys_fchroot diff --git a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl index 524155d655da..d5b6045b0090 100644 --- a/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl +++ b/tools/perf/arch/x86/entry/syscalls/syscall_64.tbl @@ -396,6 +396,7 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 common rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot # # Due to a historical design error, certain syscalls are numbered differently diff --git a/tools/perf/arch/xtensa/entry/syscalls/syscall.tbl b/tools/perf/arch/xtensa/entry/syscalls/syscall.tbl index a9bca4e484de..d354bb231796 100644 --- a/tools/perf/arch/xtensa/entry/syscalls/syscall.tbl +++ b/tools/perf/arch/xtensa/entry/syscalls/syscall.tbl @@ -442,3 +442,4 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 common rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot diff --git a/tools/scripts/syscall.tbl b/tools/scripts/syscall.tbl index 7a42b32b6577..0ab531605120 100644 --- a/tools/scripts/syscall.tbl +++ b/tools/scripts/syscall.tbl @@ -412,3 +412,4 @@ 469 common file_setattr sys_file_setattr 470 common listns sys_listns 471 common rseq_slice_yield sys_rseq_slice_yield +472 common fchroot sys_fchroot -- cgit