28 Sep, 2016
1 commit
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Make struct proc_inode::fd unsigned.
This allows better code generation on x86_64 (less sign extensions).
Signed-off-by: Alexey Dobriyan
Signed-off-by: Al Viro
24 Jun, 2016
1 commit
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Move the call of get_pid_ns, the call of proc_parse_options, and
the setting of s_iflags into proc_fill_super so that mount_ns
can be used.Convert proc_mount to call mount_ns and remove the now unnecessary
code.Acked-by: Seth Forshee
Reviewed-by: Djalal Harouni
Signed-off-by: "Eric W. Biederman"
01 Jul, 2015
1 commit
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Add a new function proc_create_mount_point that when used to creates a
directory that can not be added to.Add a new function is_empty_pde to test if a function is a mount
point.Update the code to use make_empty_dir_inode when reporting
a permanently empty directory to the vfs.Update the code to not allow adding to permanently empty directories.
Update /proc/openprom and /proc/fs/nfsd to be permanently empty directories.
Cc: stable@vger.kernel.org
Signed-off-by: "Eric W. Biederman"
23 Feb, 2015
1 commit
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use_pde()/unuse_pde() in ->follow_link()/->put_link() resp.
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro
17 Dec, 2014
1 commit
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Pull vfs pile #2 from Al Viro:
"Next pile (and there'll be one or two more).The large piece in this one is getting rid of /proc/*/ns/* weirdness;
among other things, it allows to (finally) make nameidata completely
opaque outside of fs/namei.c, making for easier further cleanups in
there"* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
coda_venus_readdir(): use file_inode()
fs/namei.c: fold link_path_walk() call into path_init()
path_init(): don't bother with LOOKUP_PARENT in argument
fs/namei.c: new helper (path_cleanup())
path_init(): store the "base" pointer to file in nameidata itself
make default ->i_fop have ->open() fail with ENXIO
make nameidata completely opaque outside of fs/namei.c
kill proc_ns completely
take the targets of /proc/*/ns/* symlinks to separate fs
bury struct proc_ns in fs/proc
copy address of proc_ns_ops into ns_common
new helpers: ns_alloc_inum/ns_free_inum
make proc_ns_operations work with struct ns_common * instead of void *
switch the rest of proc_ns_operations to working with &...->ns
netns: switch ->get()/->put()/->install()/->inum() to working with &net->ns
make mntns ->get()/->put()/->install()/->inum() work with &mnt_ns->ns
common object embedded into various struct ....ns
11 Dec, 2014
2 commits
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procfs inodes need only the ns_ops part; nsfs inodes don't need it at all
Signed-off-by: Al Viro
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When a lot of netdevices are created, one of the bottleneck is the
creation of proc entries. This serie aims to accelerate this part.The current implementation for the directories in /proc is using a single
linked list. This is slow when handling directories with large numbers of
entries (eg netdevice-related entries when lots of tunnels are opened).This patch replaces this linked list by a red-black tree.
Here are some numbers:
dummy30000.batch contains 30 000 times 'link add type dummy'.
Before the patch:
$ time ip -b dummy30000.batch
real 2m31.950s
user 0m0.440s
sys 2m21.440s
$ time rmmod dummy
real 1m35.764s
user 0m0.000s
sys 1m24.088sAfter the patch:
$ time ip -b dummy30000.batch
real 2m0.874s
user 0m0.448s
sys 1m49.720s
$ time rmmod dummy
real 1m13.988s
user 0m0.000s
sys 1m1.008sThe idea of improving this part was suggested by Thierry Herbelot.
[akpm@linux-foundation.org: initialise proc_root.subdir at compile time]
Signed-off-by: Nicolas Dichtel
Acked-by: David S. Miller
Cc: Thierry Herbelot .
Acked-by: "Eric W. Biederman"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
05 Dec, 2014
1 commit
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a) make get_proc_ns() return a pointer to struct ns_common
b) mirror ns_ops in dentry->d_fsdata of ns dentries, so that
is_mnt_ns_file() could get away with fewer dereferences.That way struct proc_ns becomes invisible outside of fs/proc/*.c
Signed-off-by: Al Viro
10 Oct, 2014
3 commits
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m_start() can use get_proc_task() instead, and "struct inode *"
provides more potentially useful info, see the next changes.Signed-off-by: Oleg Nesterov
Cc: Alexander Viro
Cc: Cyrill Gorcunov
Cc: "Eric W. Biederman"
Cc: Greg Ungerer
Cc: "Kirill A. Shutemov"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
A simple test-case from Kirill Shutemov
cat /proc/self/maps >/dev/null
chmod +x /proc/self/net/packet
exec /proc/self/net/packetmakes lockdep unhappy, cat/exec take seq_file->lock + cred_guard_mutex in
the opposite order.It's a false positive and probably we should not allow "chmod +x" on proc
files. Still I think that we should avoid mm_access() and cred_guard_mutex
in sys_read() paths, security checking should happen at open time. Besides,
this doesn't even look right if the task changes its ->mm between m_stop()
and m_start().Add the new "mm_struct *mm" member into struct proc_maps_private and change
proc_maps_open() to initialize it using proc_mem_open(). Change m_start() to
use priv->mm if atomic_inc_not_zero(mm_users) succeeds or return NULL (eof)
otherwise.The only complication is that proc_maps_open() users should additionally do
mmdrop() in fop->release(), add the new proc_map_release() helper for that.Note: this is the user-visible change, if the task execs after open("maps")
the new ->mm won't be visible via this file. I hope this is fine, and this
matches /proc/pid/mem bahaviour.[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Oleg Nesterov
Reported-by: "Kirill A. Shutemov"
Acked-by: Kirill A. Shutemov
Acked-by: Cyrill Gorcunov
Cc: "Eric W. Biederman"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Extract the mm_access() code from __mem_open() into the new helper,
proc_mem_open(), the next patch will add another caller.Signed-off-by: Oleg Nesterov
Acked-by: Kirill A. Shutemov
Acked-by: Cyrill Gorcunov
Cc: "Eric W. Biederman"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
10 Aug, 2014
1 commit
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Pull namespace updates from Eric Biederman:
"This is a bunch of small changes built against 3.16-rc6. The most
significant change for users is the first patch which makes setns
drmatically faster by removing unneded rcu handling.The next chunk of changes are so that "mount -o remount,.." will not
allow the user namespace root to drop flags on a mount set by the
system wide root. Aks this forces read-only mounts to stay read-only,
no-dev mounts to stay no-dev, no-suid mounts to stay no-suid, no-exec
mounts to stay no exec and it prevents unprivileged users from messing
with a mounts atime settings. I have included my test case as the
last patch in this series so people performing backports can verify
this change works correctly.The next change fixes a bug in NFS that was discovered while auditing
nsproxy users for the first optimization. Today you can oops the
kernel by reading /proc/fs/nfsfs/{servers,volumes} if you are clever
with pid namespaces. I rebased and fixed the build of the
!CONFIG_NFS_FS case yesterday when a build bot caught my typo. Given
that no one to my knowledge bases anything on my tree fixing the typo
in place seems more responsible that requiring a typo-fix to be
backported as well.The last change is a small semantic cleanup introducing
/proc/thread-self and pointing /proc/mounts and /proc/net at it. This
prevents several kinds of problemantic corner cases. It is a
user-visible change so it has a minute chance of causing regressions
so the change to /proc/mounts and /proc/net are individual one line
commits that can be trivially reverted. Unfortunately I lost and
could not find the email of the original reporter so he is not
credited. From at least one perspective this change to /proc/net is a
refgression fix to allow pthread /proc/net uses that were broken by
the introduction of the network namespace"* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
proc: Point /proc/mounts at /proc/thread-self/mounts instead of /proc/self/mounts
proc: Point /proc/net at /proc/thread-self/net instead of /proc/self/net
proc: Implement /proc/thread-self to point at the directory of the current thread
proc: Have net show up under /proc//task/
NFS: Fix /proc/fs/nfsfs/servers and /proc/fs/nfsfs/volumes
mnt: Add tests for unprivileged remount cases that have found to be faulty
mnt: Change the default remount atime from relatime to the existing value
mnt: Correct permission checks in do_remount
mnt: Move the test for MNT_LOCK_READONLY from change_mount_flags into do_remount
mnt: Only change user settable mount flags in remount
namespaces: Use task_lock and not rcu to protect nsproxy
09 Aug, 2014
3 commits
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If you're applying this patch, all /proc/$PID/* files were converted
to seq_file interface and this code became unused.Signed-off-by: Alexey Dobriyan
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Alexey Dobriyan
Cc: Al Viro
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
* remove proc_create(NULL, ...) check, let it oops
* warn about proc_create("", ...) and proc_create("very very long name", ...)
proc code keeps length as u8, no 256+ name length possible* warn about proc_create("123", ...)
/proc/$PID and /proc/misc namespaces are separate things,
but dumb module might create funky a-la $PID entry.* remove post mortem strchr('/') check
Triggering it implies either strchr() is buggy or memory corruption.
It should be VFS check anyway.In reality, none of these checks will ever trigger,
it is preparation for the next patch.Based on patch from Al Viro.
Signed-off-by: Alexey Dobriyan
Cc: Al Viro
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
05 Aug, 2014
1 commit
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/proc/thread-self is derived from /proc/self. /proc/thread-self
points to the directory in proc containing information about the
current thread.This funtionality has been missing for a long time, and is tricky to
implement in userspace as gettid() is not exported by glibc. More
importantly this allows fixing defects in /proc/mounts and /proc/net
where in a threaded application today they wind up being empty files
when only the initial pthread has exited, causing problems for other
threads.Signed-off-by: "Eric W. Biederman"
12 Mar, 2014
1 commit
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The same data is now available in sysfs, so we can remove the code
that exports it in /proc and replace it with a symlink to the sysfs
version.Tested on versatile qemu model and mpc5200 eval board. More testing
would be appreciated.v5: Fixed up conflicts with mainline changes
Signed-off-by: Grant Likely
Cc: Rob Herring
Cc: Benjamin Herrenschmidt
Cc: David S. Miller
Cc: Nathan Fontenot
Cc: Pantelis Antoniou
29 Jun, 2013
2 commits
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all instances always return ERR_PTR(-E...) or NULL, anyway
Signed-off-by: Al Viro
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Signed-off-by: Al Viro
02 May, 2013
6 commits
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Pull VFS updates from Al Viro,
Misc cleanups all over the place, mainly wrt /proc interfaces (switch
create_proc_entry to proc_create(), get rid of the deprecated
create_proc_read_entry() in favor of using proc_create_data() and
seq_file etc).7kloc removed.
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (204 commits)
don't bother with deferred freeing of fdtables
proc: Move non-public stuff from linux/proc_fs.h to fs/proc/internal.h
proc: Make the PROC_I() and PDE() macros internal to procfs
proc: Supply a function to remove a proc entry by PDE
take cgroup_open() and cpuset_open() to fs/proc/base.c
ppc: Clean up scanlog
ppc: Clean up rtas_flash driver somewhat
hostap: proc: Use remove_proc_subtree()
drm: proc: Use remove_proc_subtree()
drm: proc: Use minor->index to label things, not PDE->name
drm: Constify drm_proc_list[]
zoran: Don't print proc_dir_entry data in debug
reiserfs: Don't access the proc_dir_entry in r_open(), r_start() r_show()
proc: Supply an accessor for getting the data from a PDE's parent
airo: Use remove_proc_subtree()
rtl8192u: Don't need to save device proc dir PDE
rtl8187se: Use a dir under /proc/net/r8180/
proc: Add proc_mkdir_data()
proc: Move some bits from linux/proc_fs.h to linux/{of.h,signal.h,tty.h}
proc: Move PDE_NET() to fs/proc/proc_net.c
... -
Move non-public declarations and definitions from linux/proc_fs.h to
fs/proc/internal.h.Signed-off-by: David Howells
Signed-off-by: Al Viro -
Make the PROC_I() and PDE() macros internal to procfs. This means making
PDE_DATA() out of line. This could be made more optimal by storing
PDE()->data into inode->i_private.Also provide a __PDE_DATA() that is inline and internal to procfs.
Signed-off-by: David Howells
Signed-off-by: Al Viro -
Move some bits from linux/proc_fs.h to linux/of.h, signal.h and tty.h.
Also move proc_tty_init() and proc_device_tree_init() to fs/proc/internal.h as
they're internal to procfs.Signed-off-by: David Howells
Acked-by: Greg Kroah-Hartman
Acked-by: Grant Likely
cc: devicetree-discuss@lists.ozlabs.org
cc: linux-arch@vger.kernel.org
cc: Greg Kroah-Hartman
cc: Jri Slaby
Signed-off-by: Al Viro -
Move proc_fd() to fs/proc/fd.h.
Signed-off-by: David Howells
Signed-off-by: Al Viro -
Uninline pid_delete_dentry() as it's only used by three function pointers.
Signed-off-by: David Howells
Signed-off-by: Al Viro
30 Apr, 2013
2 commits
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Now get_vmalloc_info() is in fs/proc/mmu.c. There is no reason that this
code must be here and it's implementation needs vmlist_lock and it iterate
a vmlist which may be internal data structure for vmalloc.It is preferable that vmlist_lock and vmlist is only used in vmalloc.c
for maintainability. So move the code to vmalloc.cSigned-off-by: Joonsoo Kim
Signed-off-by: Joonsoo Kim
Cc: Thomas Gleixner
Cc: "H. Peter Anvin"
Cc: Atsushi Kumagai
Cc: Chris Metcalf
Cc: Dave Anderson
Cc: Eric Biederman
Cc: Guan Xuetao
Cc: Ingo Molnar
Cc: Vivek Goyal
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Delete create_proc_read_entry() as it no longer has any users.
Also delete read_proc_t, write_proc_t, the read_proc member of the
proc_dir_entry struct and the support functions that use them. This saves a
pointer for every PDE allocated.Signed-off-by: David Howells
Signed-off-by: Al Viro
10 Apr, 2013
4 commits
-
Signed-off-by: Al Viro
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* serialize the call of ->release() on per-pdeo mutex
* don't remove pdeo from per-pde list until we are through with itSigned-off-by: Al Viro
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* leave ->proc_fops alone; make ->pde_users negative instead
* trim pde_opener
* move relevant code in fs/proc/inode.cSigned-off-by: Al Viro
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Just have it pinned in dcache all along and let procfs ->kill_sb()
drop it before kill_anon_super().Signed-off-by: Al Viro
28 Feb, 2013
1 commit
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The existing SUID_DUMP_* defines duplicate the newer SUID_DUMPABLE_*
defines introduced in 54b501992dd2 ("coredump: warn about unsafe
suid_dumpable / core_pattern combo"). Remove the new ones, and use the
prior values instead.Signed-off-by: Kees Cook
Reported-by: Chen Gang
Cc: Alexander Viro
Cc: Alan Cox
Cc: "Eric W. Biederman"
Cc: Doug Ledford
Cc: Serge Hallyn
Cc: James Morris
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
19 Nov, 2012
1 commit
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I had visions at one point of splitting proc into two filesystems. If
that had happened proc/self being the the part of proc that actually deals
with pids would have been a nice cleanup. As it is proc/self requires
a lot of unnecessary infrastructure for a single file.The only user visible change is that a mounted /proc for a pid namespace
that is dead now shows a broken proc symlink, instead of being completely
invisible. I don't think anyone will notice or care.Signed-off-by: Eric W. Biederman
20 Oct, 2012
1 commit
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/proc//numa_maps scans vma and show mempolicy under
mmap_sem. It sometimes accesses task->mempolicy which can
be freed without mmap_sem and numa_maps can show some
garbage while scanning.This patch tries to take reference count of task->mempolicy at reading
numa_maps before calling get_vma_policy(). By this, task->mempolicy
will not be freed until numa_maps reaches its end.V2->v3
- updated comments to be more verbose.
- removed task_lock() in numa_maps code.
V1->V2
- access task->mempolicy only once and remember it. Becase kernel/exit.c
can overwrite it.Signed-off-by: KAMEZAWA Hiroyuki
Acked-by: David Rientjes
Acked-by: KOSAKI Motohiro
Signed-off-by: Linus Torvalds
06 Oct, 2012
1 commit
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Cosmetic. Change setup_new_exec() and task_dumpable() to use
SUID_DUMPABLE_ENABLED for /bin/grep.[akpm@linux-foundation.org: checkpatch fixes]
Signed-off-by: Oleg Nesterov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
27 Sep, 2012
1 commit
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This patch prepares the ground for further extension of
/proc/pid/fd[info] handling code by moving fdinfo handling
code into fs/proc/fd.c.I think such move makes both fs/proc/base.c and fs/proc/fd.c
easier to read.Signed-off-by: Cyrill Gorcunov
Acked-by: Pavel Emelyanov
CC: Al Viro
CC: Alexey Dobriyan
CC: Andrew Morton
CC: James Bottomley
CC: "Aneesh Kumar K.V"
CC: Alexey Dobriyan
CC: Matthew Helsley
CC: "J. Bruce Fields"
CC: "Aneesh Kumar K.V"
Signed-off-by: Al Viro
14 Jul, 2012
2 commits
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Just the flags; only NFS cares even about that, but there are
legitimate uses for such argument. And getting rid of that
completely would require splitting ->lookup() into a couple
of methods (at least), so let's leave that alone for now...Signed-off-by: Al Viro
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Just the lookup flags. Die, bastard, die...
Signed-off-by: Al Viro
01 Jun, 2012
2 commits
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When we do checkpoint of a task we need to know the list of children the
task, has but there is no easy and fast way to generate reverse
parent->children chain from arbitrary (while a parent pid is
provided in "PPid" field of /proc//status).So instead of walking over all pids in the system (creating one big
process tree in memory, just to figure out which children a task has) --
we add explicit /proc//task//children entry, because the kernel
already has this kind of information but it is not yet exported.This is a first level children, not the whole process tree.
Signed-off-by: Cyrill Gorcunov
Reviewed-by: Oleg Nesterov
Reviewed-by: Kees Cook
Cc: Pavel Emelyanov
Cc: Serge Hallyn
Cc: KAMEZAWA Hiroyuki
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
mm_for_maps() is a simple wrapper for mm_access(), and the name is
misleading, so just remove it and use mm_access() directly.Signed-off-by: Cong Wang
Cc: Oleg Nesterov
Cc: Alexey Dobriyan
Acked-by: Hugh Dickins
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
