pipe, sysctl: drop 'min' parameter from pipe-max-size converter

Patch series "pipe: buffer limits fixes and cleanups", v2.

This series simplifies the sysctl handler for pipe-max-size and fixes
another set of bugs related to the pipe buffer limits:

- The root user wasn't allowed to exceed the limits when creating new
  pipes.

- There was an off-by-one error when checking the limits, so a limit of
  N was actually treated as N - 1.

- F_SETPIPE_SZ accepted values over UINT_MAX.

- Reading the pipe buffer limits could be racy.

This patch (of 7):

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.

Link: http://lkml.kernel.org/r/20180111052902.14409-2-ebiggers3@gmail.com
Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: "Luis R . Rodriguez" <mcgrof@kernel.org>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/pipe.c b/fs/pipe.c
index a449ca0..1f6ec10 100644 (file)
--- 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 2dc5e98..7d9beda 100644 (file)
--- 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 2fb4e27..f21375a 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1813,7 +1813,6 @@ 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",
@@ -2615,16 +2614,10 @@ 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;
 
@@ -2635,9 +2628,6 @@ 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;
@@ -2650,11 +2640,8 @@ 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)