pm24.git/fs/exec.c, branch v3.7-rc8

freezer: exec should clear PF_NOFREEZE along with PF_KTHREAD

2012-10-25T20:28:12Z

flush_old_exec() clears PF_KTHREAD but forgets about PF_NOFREEZE. Signed-off-by: Oleg Nesterov Acked-by: Tejun Heo Cc: stable@vger.kernel.org Signed-off-by: Rafael J. Wysocki

vfs: make path_openat take a struct filename pointer

2012-10-13T00:15:09Z

...and fix up the callers. For do_file_open_root, just declare a struct filename on the stack and fill out the .name field. For do_filp_open, make it also take a struct filename pointer, and fix up its callers to call it appropriately. For filp_open, add a variant that takes a struct filename pointer and turn filp_open into a wrapper around it. Signed-off-by: Jeff Layton Signed-off-by: Al Viro

vfs: define struct filename and have getname() return it

2012-10-13T00:14:55Z

getname() is intended to copy pathname strings from userspace into a kernel buffer. The result is just a string in kernel space. It would however be quite helpful to be able to attach some ancillary info to the string. For instance, we could attach some audit-related info to reduce the amount of audit-related processing needed. When auditing is enabled, we could also call getname() on the string more than once and not need to recopy it from userspace. This patchset converts the getname()/putname() interfaces to return a struct instead of a string. For now, the struct just tracks the string in kernel space and the original userland pointer for it. Later, we'll add other information to the struct as it becomes convenient. Signed-off-by: Jeff Layton Signed-off-by: Al Viro

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

2012-10-10T03:02:25Z

Pull generic execve() changes from Al Viro: "This introduces the generic kernel_thread() and kernel_execve() functions, and switches x86, arm, alpha, um and s390 over to them." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: (26 commits) s390: convert to generic kernel_execve() s390: switch to generic kernel_thread() s390: fold kernel_thread_helper() into ret_from_fork() s390: fold execve_tail() into start_thread(), convert to generic sys_execve() um: switch to generic kernel_thread() x86, um/x86: switch to generic sys_execve and kernel_execve x86: split ret_from_fork alpha: introduce ret_from_kernel_execve(), switch to generic kernel_execve() alpha: switch to generic kernel_thread() alpha: switch to generic sys_execve() arm: get rid of execve wrapper, switch to generic execve() implementation arm: optimized current_pt_regs() arm: introduce ret_from_kernel_execve(), switch to generic kernel_execve() arm: split ret_from_fork, simplify kernel_thread() [based on patch by rmk] generic sys_execve() generic kernel_execve() new helper: current_pt_regs() preparation for generic kernel_thread() um: kill thread->forking um: let signal_delivered() do SIGTRAP on singlestepping into handler ...

mm: avoid taking rmap locks in move_ptes()

2012-10-09T07:22:42Z

During mremap(), the destination VMA is generally placed after the original vma in rmap traversal order: in move_vma(), we always have new_pgoff >= vma->vm_pgoff, and as a result new_vma->vm_pgoff >= vma->vm_pgoff unless vma_merge() merged the new vma with an adjacent one. When the destination VMA is placed after the original in rmap traversal order, we can avoid taking the rmap locks in move_ptes(). Essentially, this reintroduces the optimization that had been disabled in "mm anon rmap: remove anon_vma_moveto_tail". The difference is that we don't try to impose the rmap traversal order; instead we just rely on things being in the desired order in the common case and fall back to taking locks in the uncommon case. Also we skip the i_mmap_mutex in addition to the anon_vma lock: in both cases, the vmas are traversed in increasing vm_pgoff order with ties resolved in tree insertion order. Signed-off-by: Michel Lespinasse Cc: Andrea Arcangeli Cc: Rik van Riel Cc: Peter Zijlstra Cc: Daniel Santos Cc: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

exec: make de_thread() killable

2012-10-08T21:53:20Z

Change de_thread() to use KILLABLE rather than UNINTERRUPTIBLE while waiting for other threads. The only complication is that we should clear ->group_exit_task and ->notify_count before we return, and we should do this under tasklist_lock. -EAGAIN is used to match the initial signal_group_exit() check/return, it doesn't really matter. This fixes the (unlikely) race with coredump. de_thread() checks signal_group_exit() before it starts to kill the subthreads, but this can't help if another CLONE_VM (but non CLONE_THREAD) task starts the coredumping after de_thread() unlocks ->siglock. In this case the killed sub-thread can block in exit_mm() waiting for coredump_finish(), execing thread waits for that sub-thead, and the coredumping thread waits for execing thread. Deadlock. Signed-off-by: Oleg Nesterov Signed-off-by: Linus Torvalds

coredump: use SUID_DUMPABLE_ENABLED rather than hardcoded 1

2012-10-05T18:05:16Z

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

coredump: update coredump-related headers

2012-10-05T18:05:15Z

Create a new header file, fs/coredump.h, which contains functions only used by the new coredump.c. It also moves do_coredump to the include/linux/coredump.h header file, for consistency. Signed-off-by: Alex Kelly Reviewed-by: Josh Triplett Acked-by: Serge Hallyn Acked-by: Kees Cook Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

coredump: move core dump functionality into its own file

2012-10-03T01:35:55Z

This prepares for making core dump functionality optional. The variable "suid_dumpable" and associated functions are left in fs/exec.c because they're used elsewhere, such as in ptrace. Signed-off-by: Alex Kelly Reviewed-by: Josh Triplett Acked-by: Serge Hallyn Acked-by: Kees Cook Signed-off-by: Andrew Morton Signed-off-by: Al Viro

generic sys_execve()

2012-10-01T02:20:51Z

Selected by __ARCH_WANT_SYS_EXECVE in unistd.h. Requires * working current_pt_regs() * *NOT* doing a syscall-in-kernel kind of kernel_execve() implementation. Using generic kernel_execve() is fine. Signed-off-by: Al Viro