linux-kernel - [PATCH 2/2] do_coredump: move !ispipe code into "else" branch

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Date:	Fri, 26 Jun 2009 21:16:02 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Neil Horman <nhorman@...driver.com>
Cc:	linux-kernel@...r.kernel.org, earl_chew@...lent.com,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Andi Kleen <andi@...stfloor.org>,
	Roland McGrath <roland@...hat.com>
Subject: [PATCH 2/2] do_coredump: move !ispipe code into "else" branch

do_coredump() does a lot of file checks which are only needed when !ispipe,
move them into "else" branch.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>

--- WAIT/fs/exec.c~CD_2_ISPIPE	2009-06-26 20:06:01.000000000 +0200
+++ WAIT/fs/exec.c	2009-06-26 20:59:57.000000000 +0200
@@ -1784,9 +1784,6 @@ void do_coredump(long signr, int exit_co
 	 * at which point file size limits and permissions will be imposed
 	 * as it does with any other process
 	 */
-	if ((!ispipe) && (core_limit < binfmt->min_coredump))
-		goto fail_unlock;
-
  	if (ispipe) {
 		helper_argv = argv_split(GFP_KERNEL, corename+1, &helper_argc);
 		if (!helper_argv) {
@@ -1818,39 +1815,43 @@ void do_coredump(long signr, int exit_co
 			       corename);
  			goto fail_unlock;
  		}
- 	} else
+	} else {
+		if (core_limit < binfmt->min_coredump)
+			goto fail_unlock;
+
  		file = filp_open(corename,
 				 O_CREAT | 2 | O_NOFOLLOW | O_LARGEFILE | flag,
 				 0600);
-	if (IS_ERR(file))
-		goto fail_unlock;
-	inode = file->f_path.dentry->d_inode;
-	if (inode->i_nlink > 1)
-		goto close_fail;	/* multiple links - don't dump */
-	if (!ispipe && d_unhashed(file->f_path.dentry))
-		goto close_fail;
+		if (IS_ERR(file))
+			goto fail_unlock;
 
-	/* AK: actually i see no reason to not allow this for named pipes etc.,
-	   but keep the previous behaviour for now. */
-	if (!ispipe && !S_ISREG(inode->i_mode))
-		goto close_fail;
-	/*
-	 * Dont allow local users get cute and trick others to coredump
-	 * into their pre-created files:
-	 */
-	if (inode->i_uid != current_fsuid())
-		goto close_fail;
-	if (!file->f_op)
-		goto close_fail;
-	if (!file->f_op->write)
-		goto close_fail;
-	if (!ispipe && do_truncate(file->f_path.dentry, 0, 0, file) != 0)
-		goto close_fail;
+		if (d_unhashed(file->f_path.dentry))
+			goto close_fail;
+		inode = file->f_path.dentry->d_inode;
+		if (inode->i_nlink > 1)
+			goto close_fail;   /* multiple links - don't dump */
+		/* AK: actually i see no reason to not allow this for named
+		   pipes etc, but keep the previous behaviour for now. */
+		if (!S_ISREG(inode->i_mode))
+			goto close_fail;
+		/*
+		 * Dont allow local users get cute and trick others to coredump
+		 * into their pre-created files:
+		 */
+		if (inode->i_uid != current_fsuid())
+			goto close_fail;
+		if (!file->f_op)
+			goto close_fail;
+		if (!file->f_op->write)
+			goto close_fail;
+		if (do_truncate(file->f_path.dentry, 0, 0, file) != 0)
+			goto close_fail;
+	}
 
 	retval = binfmt->core_dump(signr, regs, file, core_limit);
-
 	if (retval)
 		current->signal->group_exit_code |= 0x80;
+
 close_fail:
 	filp_close(file, NULL);
 fail_unlock:

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