linux-stable.git/fs/proc, branch linux-2.6.26.y

sched: fix process time monotonicity

2008-10-09T03:22:56+00:00

commit 49048622eae698e5c4ae61f7e71200f265ccc529 upstream

Spencer reported a problem where utime and stime were going negative despite
the fixes in commit b27f03d4bdc145a09fb7b0c0e004b29f1ee555fa. The suspected
reason for the problem is that signal_struct maintains it's own utime and
stime (of exited tasks), these are not updated using the new task_utime()
routine, hence sig->utime can go backwards and cause the same problem
to occur (sig->utime, adds tsk->utime and not task_utime()). This patch
fixes the problem

TODO: using max(task->prev_utime, derived utime) works for now, but a more
generic solution is to implement cputime_max() and use the cputime_gt()
function for comparison.

Reported-by: spencer@bluehost.com
Signed-off-by: Balbir Singh 
Signed-off-by: Peter Zijlstra 
Signed-off-by: Ingo Molnar 
Signed-off-by: Greg Kroah-Hartman

proc: fix /proc/*/pagemap some more

2008-08-01T19:43:04+00:00

commit ee1e6ab6056a8b9c19377257002da98b83819531 upstream

struct pagemap_walk was placed on stack, some hooks are initialized, the
rest (->pgd_entry, ->pud_entry, ->pte_entry) are valid but junk.

Reported-by: Eric Sesterhenn 
Signed-off-by: Alexey Dobriyan 
Cc: "Vegard Nossum" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

Fix pagemap_read() use of struct mm_walk

2008-07-05T20:13:44+00:00

Fix some issues in pagemap_read noted by Alexey:

- initialize pagemap_walk.mm to "mm" , so the code starts working as
  advertised

- initialize ->private to "&pm" so it wouldn't immediately oops in
  pagemap_pte_hole()

- unstatic struct pagemap_walk, so two threads won't fsckup each other
  (including those started by root, including flipping ->mm when you don't
  have permissions)

- pagemap_read() contains two calls to ptrace_may_attach(), second one
  looks unneeded.

- avoid possible kmalloc(0) and integer wraparound.

Cc: Alexey Dobriyan 
Cc: Matt Mackall 
Signed-off-by: Andrew Morton 
[ Personally, I'd just remove the functionality entirely  - Linus ]
Signed-off-by: Linus Torvalds

Fix clear_refs_write() use of struct mm_walk

2008-07-05T20:07:56+00:00

Don't use a static entry, so as to prevent races during concurrent use
of this function.

Reported-by: Alexey Dobriyan 
Cc: Matt Mackall 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

pagemap: fix large pages in pagemap

2008-06-13T01:05:41+00:00

We were walking right into huge page areas in the pagemap walker, and
calling the pmds pmd_bad() and clearing them.

That leaked huge pages.  Bad.

This patch at least works around that for now.  It ignores huge pages in
the pagemap walker for the time being, and won't leak those pages.

Signed-off-by: Dave Hansen 
Acked-by: Matt Mackall 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

pagemap: pass mm into pagewalkers

2008-06-13T01:05:41+00:00

We need this at least for huge page detection for now, because powerpc
needs the vm_area_struct to be able to determine whether a virtual address
is referring to a huge page (its pmd_huge() doesn't work).

It might also come in handy for some of the other users.

Signed-off-by: Dave Hansen 
Acked-by: Matt Mackall 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/chrisw/lsm-2.6

2008-06-06T18:31:55+00:00

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/chrisw/lsm-2.6:
  capabilities: remain source compatible with 32-bit raw legacy capability support.
  LSM: remove stale web site from MAINTAINERS

pagemap: return EINVAL, not EIO, for unaligned reads of kpagecount or kpageflags

2008-06-06T18:29:13+00:00

If the user tries to read from a position that is not a multiple of 8, or
read a number of bytes that is not a multiple of 8, they have passed an
invalid argument to read, for the purpose of reading these files.  It's
not an IO error because we didn't encounter any trouble finding the data
they asked for.

Signed-off-by: Thomas Tuttle 
Cc: Matt Mackall 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

pagemap: return map count, not reference count, in /proc/kpagecount

2008-06-06T18:29:13+00:00

Since pagemap is all about examining pages mapped into processes' memory
spaces, it makes sense for kpagecount to return the map counts, not the
reference counts.

Signed-off-by: Thomas Tuttle 
Cc: Matt Mackall 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

proc: calculate the correct /proc/ link count

2008-06-06T18:29:13+00:00

This patch:

  commit e9720acd728a46cb40daa52c99a979f7c4ff195c
  Author: Pavel Emelyanov 
  Date:   Fri Mar 7 11:08:40 2008 -0800

    [NET]: Make /proc/net a symlink on /proc/self/net (v3)

introduced a /proc/self/net directory without bumping the corresponding
link count for /proc/self.

This patch replaces the static link count initializations with a call that
counts the number of directory entries in the given pid_entry table
whenever it is instantiated, and thus relieves the burden of manually
keeping the two in sync.

[akpm@linux-foundation.org: cleanup]
Acked-by: Eric W. Biederman 
Cc: Pavel Emelyanov 
Signed-off-by: Vegard Nossum 
Cc: "David S. Miller" 
Cc: Alexey Dobriyan 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds