coredump: make mm->core_state visible to ->core_dump()

Move the "struct core_state core_state" from coredump_wait() to
do_coredump(), this makes mm->core_state visible to binfmt->core_dump().

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/exec.c b/fs/exec.c
index 15d493f..b8ee842 100644 (file)
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1595,17 +1595,16 @@ done:
        return nr;
 }
 
-static int coredump_wait(int exit_code)
+static int coredump_wait(int exit_code, struct core_state *core_state)
 {
        struct task_struct *tsk = current;
        struct mm_struct *mm = tsk->mm;
-       struct core_state core_state;
        struct completion *vfork_done;
        int core_waiters;
 
        init_completion(&mm->core_done);
-       init_completion(&core_state.startup);
-       core_waiters = zap_threads(tsk, mm, &core_state, exit_code);
+       init_completion(&core_state->startup);
+       core_waiters = zap_threads(tsk, mm, core_state, exit_code);
        up_write(&mm->mmap_sem);
 
        if (unlikely(core_waiters < 0))
@@ -1622,8 +1621,7 @@ static int coredump_wait(int exit_code)
        }
 
        if (core_waiters)
-               wait_for_completion(&core_state.startup);
-       mm->core_state = NULL;
+               wait_for_completion(&core_state->startup);
 fail:
        return core_waiters;
 }
@@ -1679,6 +1677,7 @@ int get_dumpable(struct mm_struct *mm)
 
 int do_coredump(long signr, int exit_code, struct pt_regs * regs)
 {
+       struct core_state core_state;
        char corename[CORENAME_MAX_SIZE + 1];
        struct mm_struct *mm = current->mm;
        struct linux_binfmt * binfmt;
@@ -1717,7 +1716,7 @@ int do_coredump(long signr, int exit_code, struct pt_regs * regs)
                current->fsuid = 0;     /* Dump root private */
        }
 
-       retval = coredump_wait(exit_code);
+       retval = coredump_wait(exit_code, &core_state);
        if (retval < 0)
                goto fail;
 
@@ -1812,6 +1811,7 @@ fail_unlock:
 
        current->fsuid = fsuid;
        complete_all(&mm->core_done);
+       mm->core_state = NULL;
 fail:
        return retval;
 }