ptrace: remove PTRACE_SEIZE_DEVEL bit

PTRACE_SEIZE code is tested and ready for production use, remove the
code which requires special bit in data argument to make PTRACE_SEIZE
work.

Strace team prepares for a new release of strace, and we would like to
ship the code which uses PTRACE_SEIZE, preferably after this change goes
into released kernel.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Pedro Alves <palves@redhat.com>
Cc: Jan Kratochvil <jan.kratochvil@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 15 deletions

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 4661c5bc07e5..ee8d49b9c309 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -237,25 +237,10 @@ static int ptrace_attach(struct task_struct *task, long request,
         bool seize = (request == PTRACE_SEIZE);
         int retval;
 
-        /*
-         * SEIZE will enable new ptrace behaviors which will be implemented
-         * gradually.  SEIZE_DEVEL bit is used to prevent applications
-         * expecting full SEIZE behaviors trapping on kernel commits which
-         * are still in the process of implementing them.
-         *
-         * Only test programs for new ptrace behaviors being implemented
-         * should set SEIZE_DEVEL.  If unset, SEIZE will fail with -EIO.
-         *
-         * Once SEIZE behaviors are completely implemented, this flag
-         * will be removed.
-         */
         retval = -EIO;
         if (seize) {
                 if (addr != 0)
                         goto out;
-                if (!(flags & PTRACE_SEIZE_DEVEL))
-                        goto out;
-                flags &= ~(unsigned long)PTRACE_SEIZE_DEVEL;
                 if (flags & ~(unsigned long)PTRACE_O_MASK)
                         goto out;
                 flags = PT_PTRACED | PT_SEIZED | (flags << PT_OPT_FLAG_SHIFT);