linux-kernel - [PATCH v2 1/7] pipe, sysctl: drop 'min' parameter from pipe-max-size converter

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Date:   Wed, 10 Jan 2018 21:28:56 -0800
From:   Eric Biggers <ebiggers3@...il.com>
To:     linux-fsdevel@...r.kernel.org
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Willy Tarreau <w@....eu>,
        Mikulas Patocka <mpatocka@...hat.com>,
        "Luis R . Rodriguez" <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org, Eric Biggers <ebiggers@...gle.com>
Subject: [PATCH v2 1/7] pipe, sysctl: drop 'min' parameter from pipe-max-size converter

From: Eric Biggers <ebiggers@...gle.com>

Before validating the given value against pipe_min_size,
do_proc_dopipe_max_size_conv() calls round_pipe_size(), which rounds the
value up to pipe_min_size.  Therefore, the second check against
pipe_min_size is redundant.  Remove it.

Acked-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 fs/pipe.c                 | 10 +++-------
 include/linux/pipe_fs_i.h |  2 +-
 kernel/sysctl.c           | 15 +--------------
 3 files changed, 5 insertions(+), 22 deletions(-)

diff --git a/fs/pipe.c b/fs/pipe.c
index 6d98566201ef..a75f5d2ca99c 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -35,11 +35,6 @@
  */
 unsigned int pipe_max_size = 1048576;
 
-/*
- * Minimum pipe size, as required by POSIX
- */
-unsigned int pipe_min_size = PAGE_SIZE;
-
 /* Maximum allocatable pages per user. Hard limit is unset by default, soft
  * matches default values.
  */
@@ -1024,8 +1019,9 @@ unsigned int round_pipe_size(unsigned int size)
 {
 	unsigned long nr_pages;
 
-	if (size < pipe_min_size)
-		size = pipe_min_size;
+	/* Minimum pipe size, as required by POSIX */
+	if (size < PAGE_SIZE)
+		size = PAGE_SIZE;
 
 	nr_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 	if (nr_pages == 0)
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index 2dc5e9870fcd..7d9beda14584 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -167,7 +167,7 @@ void pipe_lock(struct pipe_inode_info *);
 void pipe_unlock(struct pipe_inode_info *);
 void pipe_double_lock(struct pipe_inode_info *, struct pipe_inode_info *);
 
-extern unsigned int pipe_max_size, pipe_min_size;
+extern unsigned int pipe_max_size;
 extern unsigned long pipe_user_pages_hard;
 extern unsigned long pipe_user_pages_soft;
 int pipe_proc_fn(struct ctl_table *, int, void __user *, size_t *, loff_t *);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 557d46728577..a71ebb5c5182 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1820,7 +1820,6 @@ static struct ctl_table fs_table[] = {
 		.maxlen		= sizeof(pipe_max_size),
 		.mode		= 0644,
 		.proc_handler	= &pipe_proc_fn,
-		.extra1		= &pipe_min_size,
 	},
 	{
 		.procname	= "pipe-user-pages-hard",
@@ -2622,16 +2621,10 @@ int proc_douintvec_minmax(struct ctl_table *table, int write,
 				 do_proc_douintvec_minmax_conv, &param);
 }
 
-struct do_proc_dopipe_max_size_conv_param {
-	unsigned int *min;
-};
-
 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
 					unsigned int *valp,
 					int write, void *data)
 {
-	struct do_proc_dopipe_max_size_conv_param *param = data;
-
 	if (write) {
 		unsigned int val;
 
@@ -2642,9 +2635,6 @@ static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
 		if (val == 0)
 			return -EINVAL;
 
-		if (param->min && *param->min > val)
-			return -ERANGE;
-
 		*valp = val;
 	} else {
 		unsigned int val = *valp;
@@ -2657,11 +2647,8 @@ static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
 int proc_dopipe_max_size(struct ctl_table *table, int write,
 			 void __user *buffer, size_t *lenp, loff_t *ppos)
 {
-	struct do_proc_dopipe_max_size_conv_param param = {
-		.min = (unsigned int *) table->extra1,
-	};
 	return do_proc_douintvec(table, write, buffer, lenp, ppos,
-				 do_proc_dopipe_max_size_conv, &param);
+				 do_proc_dopipe_max_size_conv, NULL);
 }
 
 static void validate_coredump_safety(void)
-- 
2.15.1