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authorEric Biggers <ebiggers@google.com>2018-02-07 02:41:49 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-07 05:32:47 +0300
commit319e0a21bb7823abbb4818fe2724e572bbac77a2 (patch)
tree99dca1041887a3131014b99dbef9244c8affce00
parent4c2e4befb3cc9ce42d506aa537c9ab504723e98c (diff)
downloadlinux-319e0a21bb7823abbb4818fe2724e572bbac77a2.tar.xz
pipe, sysctl: remove pipe_proc_fn()
pipe_proc_fn() is no longer needed, as it only calls through to proc_dopipe_max_size(). Just put proc_dopipe_max_size() in the ctl_table entry directly, and remove the unneeded EXPORT_SYMBOL() and the ENOSYS stub for it. (The reason the ENOSYS stub isn't needed is that the pipe-max-size ctl_table entry is located directly in 'kern_table' rather than being registered separately. Therefore, the entry is already only defined when the kernel is built with sysctl support.) Link: http://lkml.kernel.org/r/20180111052902.14409-3-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>
-rw-r--r--fs/pipe.c10
-rw-r--r--include/linux/pipe_fs_i.h1
-rw-r--r--include/linux/sysctl.h3
-rw-r--r--kernel/sysctl.c15
4 files changed, 5 insertions, 24 deletions
diff --git a/fs/pipe.c b/fs/pipe.c
index 1f6ec1051e59..61adbf0f5b53 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -1121,16 +1121,6 @@ out_revert_acct:
}
/*
- * This should work even if CONFIG_PROC_FS isn't set, as proc_dopipe_max_size
- * will return an error.
- */
-int pipe_proc_fn(struct ctl_table *table, int write, void __user *buf,
- size_t *lenp, loff_t *ppos)
-{
- return proc_dopipe_max_size(table, write, buf, lenp, ppos);
-}
-
-/*
* After the inode slimming patch, i_pipe/i_bdev/i_cdev share the same
* location, so checking ->i_pipe is not enough to verify that this is a
* pipe.
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index 7d9beda14584..5028bd4b2c96 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -170,7 +170,6 @@ void pipe_double_lock(struct pipe_inode_info *, struct pipe_inode_info *);
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 *);
/* Drop the inode semaphore and wait for a pipe event, atomically */
void pipe_wait(struct pipe_inode_info *pipe);
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 992bc9948232..b769ecfcc3bd 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -51,9 +51,6 @@ extern int proc_dointvec_minmax(struct ctl_table *, int,
extern int proc_douintvec_minmax(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos);
-extern int proc_dopipe_max_size(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp,
- loff_t *ppos);
extern int proc_dointvec_jiffies(struct ctl_table *, int,
void __user *, size_t *, loff_t *);
extern int proc_dointvec_userhz_jiffies(struct ctl_table *, int,
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index f21375aa6cf6..59f09ea3ca3e 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -218,6 +218,8 @@ static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
static int proc_dostring_coredump(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos);
#endif
+static int proc_dopipe_max_size(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos);
#ifdef CONFIG_MAGIC_SYSRQ
/* Note: sysrq code uses it's own private copy */
@@ -1812,7 +1814,7 @@ static struct ctl_table fs_table[] = {
.data = &pipe_max_size,
.maxlen = sizeof(pipe_max_size),
.mode = 0644,
- .proc_handler = &pipe_proc_fn,
+ .proc_handler = proc_dopipe_max_size,
},
{
.procname = "pipe-user-pages-hard",
@@ -2637,8 +2639,8 @@ static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
return 0;
}
-int proc_dopipe_max_size(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
+static int proc_dopipe_max_size(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
{
return do_proc_douintvec(table, write, buffer, lenp, ppos,
do_proc_dopipe_max_size_conv, NULL);
@@ -3147,12 +3149,6 @@ int proc_douintvec_minmax(struct ctl_table *table, int write,
return -ENOSYS;
}
-int proc_dopipe_max_size(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- return -ENOSYS;
-}
-
int proc_dointvec_jiffies(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
@@ -3196,7 +3192,6 @@ EXPORT_SYMBOL(proc_douintvec);
EXPORT_SYMBOL(proc_dointvec_jiffies);
EXPORT_SYMBOL(proc_dointvec_minmax);
EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
-EXPORT_SYMBOL_GPL(proc_dopipe_max_size);
EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
EXPORT_SYMBOL(proc_dostring);