A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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New locking/refcounting for fs_struct

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* all changes of current->fs are done under task_lock and write_lock of
  old fs->lock
* refcount is not atomic anymore (same protection)
* its decrements are done when removing reference from current; at the
  same time we decide whether to free it.
* put_fs_struct() is gone
* new field - ->in_exec.  Set by check_unsafe_exec() if we are trying to do
  execve() and only subthreads share fs_struct.  Cleared when finishing exec
  (success and failure alike).  Makes CLONE_FS fail with -EAGAIN if set.
* check_unsafe_exec() may fail with -EAGAIN if another execve() from subthread
  is in progress.

Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2009-03-30 07:20:30 -04:00
commit 498052bba5
7 changed files with 121 additions and 44 deletions
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2
fs/internal.h
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@ -44,7 +44,7 @@ extern void __init chrdev_init(void);
/*
* exec.c
*/
extern void check_unsafe_exec(struct linux_binprm *);
extern int check_unsafe_exec(struct linux_binprm *);
/*
* namespace.c