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Date:   Fri, 24 May 2019 20:32:43 +0000
From:   Michael Tirado <mtirado418@...il.com>
To:     Christian Brauner <christian@...uner.io>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] open: add close_range()

What I do in ring=non-supervisor is close all fd's while
checking against an array of exemptions. if /proc is not
mounted I close RLIMIT_NOFILE, if that fails I use a dumb
loop to close everything(slooow). This new system call could
significantly increase the fallback code, but If you use a
range then you may have to call this in batches, depending
on the fd number sequence?

Here's what it looks like in practice:

   int exempt[] = { STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO };
   if (close_descriptors(exempt, 3))
      return -1;

On Tue, May 21, 2019 at 11:41 AM Christian Brauner <christian@...uner.io> wrote:
>
> This adds the close_range() syscall. It allows to efficiently close a range
> of file descriptors up to all file descriptors of a calling task.
>
> The syscall came up in a recent discussion around the new mount API and
> making new file descriptor types cloexec by default. During this
> discussion, Al suggested the close_range() syscall (cf. [1]). Note, a
> syscall in this manner has been requested by various people over time.
>
> First, it helps to close all file descriptors of an exec()ing task. This
> can be done safely via (quoting Al's example from [1] verbatim):
>
>         /* that exec is sensitive */
>         unshare(CLONE_FILES);
>         /* we don't want anything past stderr here */
>         close_range(3, ~0U);
>         execve(....);
>
> The code snippet above is one way of working around the problem that file
> descriptors are not cloexec by default. This is aggravated by the fact that
> we can't just switch them over without massively regressing userspace. For
> a whole class of programs having an in-kernel method of closing all file
> descriptors is very helpful (e.g. demons, service managers, programming
> language standard libraries, container managers etc.).
> (Please note, unshare(CLONE_FILES) should only be needed if the calling
>  task is multi-threaded and shares the file descriptor table with another
>  thread in which case two threads could race with one thread allocating
>  file descriptors and the other one closing them via close_range(). For the
>  general case close_range() before the execve() is sufficient.)
>
> Second, it allows userspace to avoid implementing closing all file
> descriptors by parsing through /proc/<pid>/fd/* and calling close() on each
> file descriptor. From looking at various large(ish) userspace code bases
> this or similar patterns are very common in:
> - service managers (cf. [4])
> - libcs (cf. [6])
> - container runtimes (cf. [5])
> - programming language runtimes/standard libraries
>   - Python (cf. [2])
>   - Rust (cf. [7], [8])
> As Dmitry pointed out there's even a long-standing glibc bug about missing
> kernel support for this task (cf. [3]).
> In addition, the syscall will also work for tasks that do not have procfs
> mounted and on kernels that do not have procfs support compiled in. In such
> situations the only way to make sure that all file descriptors are closed
> is to call close() on each file descriptor up to UINT_MAX or RLIMIT_NOFILE,
> OPEN_MAX trickery (cf. comment [8] on Rust).
>
> The performance is striking. For good measure, comparing the following
> simple close_all_fds() userspace implementation that is essentially just
> glibc's version in [6]:
>
> static int close_all_fds(void)
> {
>         DIR *dir;
>         struct dirent *direntp;
>
>         dir = opendir("/proc/self/fd");
>         if (!dir)
>                 return -1;
>
>         while ((direntp = readdir(dir))) {
>                 int fd;
>                 if (strcmp(direntp->d_name, ".") == 0)
>                         continue;
>                 if (strcmp(direntp->d_name, "..") == 0)
>                         continue;
>                 fd = atoi(direntp->d_name);
>                 if (fd == 0 || fd == 1 || fd == 2)
>                         continue;
>                 close(fd);
>         }
>
>         closedir(dir); /* cannot fail */
>         return 0;
> }
>
> to close_range() yields:
> 1. closing 4 open files:
>    - close_all_fds(): ~280 us
>    - close_range():    ~24 us
>
> 2. closing 1000 open files:
>    - close_all_fds(): ~5000 us
>    - close_range():   ~800 us
>
> close_range() is designed to allow for some flexibility. Specifically, it
> does not simply always close all open file descriptors of a task. Instead,
> callers can specify an upper bound.
> This is e.g. useful for scenarios where specific file descriptors are
> created with well-known numbers that are supposed to be excluded from
> getting closed.
> For extra paranoia close_range() comes with a flags argument. This can e.g.
> be used to implement extension. Once can imagine userspace wanting to stop
> at the first error instead of ignoring errors under certain circumstances.
> There might be other valid ideas in the future. In any case, a flag
> argument doesn't hurt and keeps us on the safe side.
>
> From an implementation side this is kept rather dumb. It saw some input
> from David and Jann but all nonsense is obviously my own!
> - Errors to close file descriptors are currently ignored. (Could be changed
>   by setting a flag in the future if needed.)
> - __close_range() is a rather simplistic wrapper around __close_fd().
>   My reasoning behind this is based on the nature of how __close_fd() needs
>   to release an fd. But maybe I misunderstood specifics:
>   We take the files_lock and rcu-dereference the fdtable of the calling
>   task, we find the entry in the fdtable, get the file and need to release
>   files_lock before calling filp_close().
>   In the meantime the fdtable might have been altered so we can't just
>   retake the spinlock and keep the old rcu-reference of the fdtable
>   around. Instead we need to grab a fresh reference to the fdtable.
>   If my reasoning is correct then there's really no point in fancyfying
>   __close_range(): We just need to rcu-dereference the fdtable of the
>   calling task once to cap the max_fd value correctly and then go on
>   calling __close_fd() in a loop.
>
> /* References */
> [1]: https://lore.kernel.org/lkml/20190516165021.GD17978@ZenIV.linux.org.uk/
> [2]: https://github.com/python/cpython/blob/9e4f2f3a6b8ee995c365e86d976937c141d867f8/Modules/_posixsubprocess.c#L220
> [3]: https://sourceware.org/bugzilla/show_bug.cgi?id=10353#c7
> [4]: https://github.com/systemd/systemd/blob/5238e9575906297608ff802a27e2ff9effa3b338/src/basic/fd-util.c#L217
> [5]: https://github.com/lxc/lxc/blob/ddf4b77e11a4d08f09b7b9cd13e593f8c047edc5/src/lxc/start.c#L236
> [6]: https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/grantpt.c;h=2030e07fa6e652aac32c775b8c6e005844c3c4eb;hb=HEAD#l17
>      Note that this is an internal implementation that is not exported.
>      Currently, libc seems to not provide an exported version of this
>      because of missing kernel support to do this.
> [7]: https://github.com/rust-lang/rust/issues/12148
> [8]: https://github.com/rust-lang/rust/blob/5f47c0613ed4eb46fca3633c1297364c09e5e451/src/libstd/sys/unix/process2.rs#L303-L308
>      Rust's solution is slightly different but is equally unperformant.
>      Rust calls getdtablesize() which is a glibc library function that
>      simply returns the current RLIMIT_NOFILE or OPEN_MAX values. Rust then
>      goes on to call close() on each fd. That's obviously overkill for most
>      tasks. Rarely, tasks - especially non-demons - hit RLIMIT_NOFILE or
>      OPEN_MAX.
>      Let's be nice and assume an unprivileged user with RLIMIT_NOFILE set
>      to 1024. Even in this case, there's a very high chance that in the
>      common case Rust is calling the close() syscall 1021 times pointlessly
>      if the task just has 0, 1, and 2 open.
>
> Suggested-by: Al Viro <viro@...iv.linux.org.uk>
> Signed-off-by: Christian Brauner <christian@...uner.io>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Jann Horn <jannh@...gle.com>
> Cc: David Howells <dhowells@...hat.com>
> Cc: Dmitry V. Levin <ldv@...linux.org>
> Cc: Oleg Nesterov <oleg@...hat.com>
> Cc: Florian Weimer <fweimer@...hat.com>
> Cc: linux-api@...r.kernel.org
> ---
>  arch/alpha/kernel/syscalls/syscall.tbl      |  1 +
>  arch/arm/tools/syscall.tbl                  |  1 +
>  arch/arm64/include/asm/unistd32.h           |  2 ++
>  arch/ia64/kernel/syscalls/syscall.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 +
>  fs/file.c                                   | 30 +++++++++++++++++++++
>  fs/open.c                                   | 20 ++++++++++++++
>  include/linux/fdtable.h                     |  2 ++
>  include/linux/syscalls.h                    |  2 ++
>  include/uapi/asm-generic/unistd.h           |  4 ++-
>  22 files changed, 75 insertions(+), 1 deletion(-)
>
> diff --git a/arch/alpha/kernel/syscalls/syscall.tbl b/arch/alpha/kernel/syscalls/syscall.tbl
> index 9e7704e44f6d..b55d93af8096 100644
> --- a/arch/alpha/kernel/syscalls/syscall.tbl
> +++ b/arch/alpha/kernel/syscalls/syscall.tbl
> @@ -473,3 +473,4 @@
>  541    common  fsconfig                        sys_fsconfig
>  542    common  fsmount                         sys_fsmount
>  543    common  fspick                          sys_fspick
> +545    common  close_range                     sys_close_range
> diff --git a/arch/arm/tools/syscall.tbl b/arch/arm/tools/syscall.tbl
> index aaf479a9e92d..0125c97c75dd 100644
> --- a/arch/arm/tools/syscall.tbl
> +++ b/arch/arm/tools/syscall.tbl
> @@ -447,3 +447,4 @@
>  431    common  fsconfig                        sys_fsconfig
>  432    common  fsmount                         sys_fsmount
>  433    common  fspick                          sys_fspick
> +435    common  close_range                     sys_close_range
> diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h
> index c39e90600bb3..9a3270d29b42 100644
> --- a/arch/arm64/include/asm/unistd32.h
> +++ b/arch/arm64/include/asm/unistd32.h
> @@ -886,6 +886,8 @@ __SYSCALL(__NR_fsconfig, sys_fsconfig)
>  __SYSCALL(__NR_fsmount, sys_fsmount)
>  #define __NR_fspick 433
>  __SYSCALL(__NR_fspick, sys_fspick)
> +#define __NR_close_range 435
> +__SYSCALL(__NR_close_range, sys_close_range)
>
>  /*
>   * Please add new compat syscalls above this comment and update
> diff --git a/arch/ia64/kernel/syscalls/syscall.tbl b/arch/ia64/kernel/syscalls/syscall.tbl
> index e01df3f2f80d..1a90b464e96f 100644
> --- a/arch/ia64/kernel/syscalls/syscall.tbl
> +++ b/arch/ia64/kernel/syscalls/syscall.tbl
> @@ -354,3 +354,4 @@
>  431    common  fsconfig                        sys_fsconfig
>  432    common  fsmount                         sys_fsmount
>  433    common  fspick                          sys_fspick
> +435    common  close_range                     sys_close_range
> diff --git a/arch/m68k/kernel/syscalls/syscall.tbl b/arch/m68k/kernel/syscalls/syscall.tbl
> index 7e3d0734b2f3..2dee2050f9ef 100644
> --- a/arch/m68k/kernel/syscalls/syscall.tbl
> +++ b/arch/m68k/kernel/syscalls/syscall.tbl
> @@ -433,3 +433,4 @@
>  431    common  fsconfig                        sys_fsconfig
>  432    common  fsmount                         sys_fsmount
>  433    common  fspick                          sys_fspick
> +435    common  close_range                     sys_close_range
> diff --git a/arch/microblaze/kernel/syscalls/syscall.tbl b/arch/microblaze/kernel/syscalls/syscall.tbl
> index 26339e417695..923ef69e5a76 100644
> --- a/arch/microblaze/kernel/syscalls/syscall.tbl
> +++ b/arch/microblaze/kernel/syscalls/syscall.tbl
> @@ -439,3 +439,4 @@
>  431    common  fsconfig                        sys_fsconfig
>  432    common  fsmount                         sys_fsmount
>  433    common  fspick                          sys_fspick
> +435    common  close_range                     sys_close_range
> diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl
> index 0e2dd68ade57..967ed9de51cd 100644
> --- a/arch/mips/kernel/syscalls/syscall_n32.tbl
> +++ b/arch/mips/kernel/syscalls/syscall_n32.tbl
> @@ -372,3 +372,4 @@
>  431    n32     fsconfig                        sys_fsconfig
>  432    n32     fsmount                         sys_fsmount
>  433    n32     fspick                          sys_fspick
> +435    n32     close_range                     sys_close_range
> diff --git a/arch/mips/kernel/syscalls/syscall_n64.tbl b/arch/mips/kernel/syscalls/syscall_n64.tbl
> index 5eebfa0d155c..71de731102b1 100644
> --- a/arch/mips/kernel/syscalls/syscall_n64.tbl
> +++ b/arch/mips/kernel/syscalls/syscall_n64.tbl
> @@ -348,3 +348,4 @@
>  431    n64     fsconfig                        sys_fsconfig
>  432    n64     fsmount                         sys_fsmount
>  433    n64     fspick                          sys_fspick
> +435    n64     close_range                     sys_close_range
> diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl
> index 3cc1374e02d0..5a325ab29f88 100644
> --- a/arch/mips/kernel/syscalls/syscall_o32.tbl
> +++ b/arch/mips/kernel/syscalls/syscall_o32.tbl
> @@ -421,3 +421,4 @@
>  431    o32     fsconfig                        sys_fsconfig
>  432    o32     fsmount                         sys_fsmount
>  433    o32     fspick                          sys_fspick
> +435    o32     close_range                     sys_close_range
> diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl
> index c9e377d59232..dcc0a0879139 100644
> --- a/arch/parisc/kernel/syscalls/syscall.tbl
> +++ b/arch/parisc/kernel/syscalls/syscall.tbl
> @@ -430,3 +430,4 @@
>  431    common  fsconfig                        sys_fsconfig
>  432    common  fsmount                         sys_fsmount
>  433    common  fspick                          sys_fspick
> +435    common  close_range                     sys_close_range
> diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl
> index 103655d84b4b..ba2c1f078cbd 100644
> --- a/arch/powerpc/kernel/syscalls/syscall.tbl
> +++ b/arch/powerpc/kernel/syscalls/syscall.tbl
> @@ -515,3 +515,4 @@
>  431    common  fsconfig                        sys_fsconfig
>  432    common  fsmount                         sys_fsmount
>  433    common  fspick                          sys_fspick
> +435    common  close_range                     sys_close_range
> diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl
> index e822b2964a83..d7c9043d2902 100644
> --- a/arch/s390/kernel/syscalls/syscall.tbl
> +++ b/arch/s390/kernel/syscalls/syscall.tbl
> @@ -436,3 +436,4 @@
>  431  common    fsconfig                sys_fsconfig                    sys_fsconfig
>  432  common    fsmount                 sys_fsmount                     sys_fsmount
>  433  common    fspick                  sys_fspick                      sys_fspick
> +435  common    close_range             sys_close_range                 sys_close_range
> diff --git a/arch/sh/kernel/syscalls/syscall.tbl b/arch/sh/kernel/syscalls/syscall.tbl
> index 016a727d4357..9b5e6bf0ce32 100644
> --- a/arch/sh/kernel/syscalls/syscall.tbl
> +++ b/arch/sh/kernel/syscalls/syscall.tbl
> @@ -436,3 +436,4 @@
>  431    common  fsconfig                        sys_fsconfig
>  432    common  fsmount                         sys_fsmount
>  433    common  fspick                          sys_fspick
> +435    common  close_range                     sys_close_range
> diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl
> index e047480b1605..8c674a1e0072 100644
> --- a/arch/sparc/kernel/syscalls/syscall.tbl
> +++ b/arch/sparc/kernel/syscalls/syscall.tbl
> @@ -479,3 +479,4 @@
>  431    common  fsconfig                        sys_fsconfig
>  432    common  fsmount                         sys_fsmount
>  433    common  fspick                          sys_fspick
> +435    common  close_range                     sys_close_range
> diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
> index ad968b7bac72..7f7a89a96707 100644
> --- a/arch/x86/entry/syscalls/syscall_32.tbl
> +++ b/arch/x86/entry/syscalls/syscall_32.tbl
> @@ -438,3 +438,4 @@
>  431    i386    fsconfig                sys_fsconfig                    __ia32_sys_fsconfig
>  432    i386    fsmount                 sys_fsmount                     __ia32_sys_fsmount
>  433    i386    fspick                  sys_fspick                      __ia32_sys_fspick
> +435    i386    close_range             sys_close_range                 __ia32_sys_close_range
> diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
> index b4e6f9e6204a..0f7d47ae921c 100644
> --- a/arch/x86/entry/syscalls/syscall_64.tbl
> +++ b/arch/x86/entry/syscalls/syscall_64.tbl
> @@ -355,6 +355,7 @@
>  431    common  fsconfig                __x64_sys_fsconfig
>  432    common  fsmount                 __x64_sys_fsmount
>  433    common  fspick                  __x64_sys_fspick
> +435    common  close_range             __x64_sys_close_range
>
>  #
>  # x32-specific system call numbers start at 512 to avoid cache impact
> diff --git a/arch/xtensa/kernel/syscalls/syscall.tbl b/arch/xtensa/kernel/syscalls/syscall.tbl
> index 5fa0ee1c8e00..b489532265d0 100644
> --- a/arch/xtensa/kernel/syscalls/syscall.tbl
> +++ b/arch/xtensa/kernel/syscalls/syscall.tbl
> @@ -404,3 +404,4 @@
>  431    common  fsconfig                        sys_fsconfig
>  432    common  fsmount                         sys_fsmount
>  433    common  fspick                          sys_fspick
> +435    common  close_range                     sys_close_range
> diff --git a/fs/file.c b/fs/file.c
> index 3da91a112bab..3680977a685a 100644
> --- a/fs/file.c
> +++ b/fs/file.c
> @@ -641,6 +641,36 @@ int __close_fd(struct files_struct *files, unsigned fd)
>  }
>  EXPORT_SYMBOL(__close_fd); /* for ksys_close() */
>
> +/**
> + * __close_range() - Close all file descriptors in a given range.
> + *
> + * @fd:     starting file descriptor to close
> + * @max_fd: last file descriptor to close
> + *
> + * This closes a range of file descriptors. All file descriptors
> + * from @fd up to and including @max_fd are closed.
> + */
> +int __close_range(struct files_struct *files, unsigned fd, unsigned max_fd)
> +{
> +       unsigned int cur_max;
> +
> +       if (fd > max_fd)
> +               return -EINVAL;
> +
> +       rcu_read_lock();
> +       cur_max = files_fdtable(files)->max_fds;
> +       rcu_read_unlock();
> +
> +       /* cap to last valid index into fdtable */
> +       if (max_fd >= cur_max)
> +               max_fd = cur_max - 1;
> +
> +       while (fd <= max_fd)
> +               __close_fd(files, fd++);
> +
> +       return 0;
> +}
> +
>  /*
>   * variant of __close_fd that gets a ref on the file for later fput
>   */
> diff --git a/fs/open.c b/fs/open.c
> index 9c7d724a6f67..c7baaee7aa47 100644
> --- a/fs/open.c
> +++ b/fs/open.c
> @@ -1174,6 +1174,26 @@ SYSCALL_DEFINE1(close, unsigned int, fd)
>         return retval;
>  }
>
> +/**
> + * close_range() - Close all file descriptors in a given range.
> + *
> + * @fd:     starting file descriptor to close
> + * @max_fd: last file descriptor to close
> + * @flags:  reserved for future extensions
> + *
> + * This closes a range of file descriptors. All file descriptors
> + * from @fd up to and including @max_fd are closed.
> + * Currently, errors to close a given file descriptor are ignored.
> + */
> +SYSCALL_DEFINE3(close_range, unsigned int, fd, unsigned int, max_fd,
> +               unsigned int, flags)
> +{
> +       if (flags)
> +               return -EINVAL;
> +
> +       return __close_range(current->files, fd, max_fd);
> +}
> +
>  /*
>   * This routine simulates a hangup on the tty, to arrange that users
>   * are given clean terminals at login time.
> diff --git a/include/linux/fdtable.h b/include/linux/fdtable.h
> index f07c55ea0c22..fcd07181a365 100644
> --- a/include/linux/fdtable.h
> +++ b/include/linux/fdtable.h
> @@ -121,6 +121,8 @@ extern void __fd_install(struct files_struct *files,
>                       unsigned int fd, struct file *file);
>  extern int __close_fd(struct files_struct *files,
>                       unsigned int fd);
> +extern int __close_range(struct files_struct *files, unsigned int fd,
> +                        unsigned int max_fd);
>  extern int __close_fd_get_file(unsigned int fd, struct file **res);
>
>  extern struct kmem_cache *files_cachep;
> diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
> index e2870fe1be5b..c0189e223255 100644
> --- a/include/linux/syscalls.h
> +++ b/include/linux/syscalls.h
> @@ -441,6 +441,8 @@ asmlinkage long sys_fchown(unsigned int fd, uid_t user, gid_t group);
>  asmlinkage long sys_openat(int dfd, const char __user *filename, int flags,
>                            umode_t mode);
>  asmlinkage long sys_close(unsigned int fd);
> +asmlinkage long sys_close_range(unsigned int fd, unsigned int max_fd,
> +                               unsigned int flags);
>  asmlinkage long sys_vhangup(void);
>
>  /* fs/pipe.c */
> diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
> index a87904daf103..3f36c8745d24 100644
> --- a/include/uapi/asm-generic/unistd.h
> +++ b/include/uapi/asm-generic/unistd.h
> @@ -844,9 +844,11 @@ __SYSCALL(__NR_fsconfig, sys_fsconfig)
>  __SYSCALL(__NR_fsmount, sys_fsmount)
>  #define __NR_fspick 433
>  __SYSCALL(__NR_fspick, sys_fspick)
> +#define __NR_close_range 435
> +__SYSCALL(__NR_close_range, sys_close_range)
>
>  #undef __NR_syscalls
> -#define __NR_syscalls 434
> +#define __NR_syscalls 436
>
>  /*
>   * 32 bit systems traditionally used different
> --
> 2.21.0
>

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