+ ftrace-let-ftrace_enable_sysctl-take-a-kernel-pointer-buffer.patch added to -mm tree

+ ftrace-let-ftrace_enable_sysctl-take-a-kernel-pointer-buffer.patch added to -mm tree

[akpm]

The patch titled
     Subject: ftrace: let ftrace_enable_sysctl take a kernel pointer buffer
has been added to the -mm tree.  Its filename is
     ftrace-let-ftrace_enable_sysctl-take-a-kernel-pointer-buffer.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/ftrace-let-ftrace_enable_sysctl-take-a-kernel-pointer-buffer.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/ftrace-let-ftrace_enable_sysctl-take-a-kernel-pointer-buffer.patch

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------------------------------------------------------
From: Tobias Klauser <tklauser@distanz.ch>
Subject: ftrace: let ftrace_enable_sysctl take a kernel pointer buffer

Commit 32927393dc1c ("sysctl: pass kernel pointers to ->proc_handler")
changed ctl_table.proc_handler to take a kernel pointer.  Adjust the
signature of ftrace_enable_sysctl to match ctl_table.proc_handler which
fixes the following sparse warning:

kernel/trace/ftrace.c:7544:43: warning: incorrect type in argument 3 (different address spaces)
kernel/trace/ftrace.c:7544:43:    expected void *
kernel/trace/ftrace.c:7544:43:    got void [noderef] __user *buffer

Link: https://lkml.kernel.org/r/20200907093207.13540-1-tklauser@distanz.ch
Fixes: 32927393dc1c ("sysctl: pass kernel pointers to ->proc_handler")
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/ftrace.h |    3 +--
 kernel/trace/ftrace.c  |    3 +--
 2 files changed, 2 insertions(+), 4 deletions(-)

--- a/include/linux/ftrace.h~ftrace-let-ftrace_enable_sysctl-take-a-kernel-pointer-buffer
+++ a/include/linux/ftrace.h
@@ -85,8 +85,7 @@ static inline int ftrace_mod_get_kallsym
 extern int ftrace_enabled;
 extern int
 ftrace_enable_sysctl(struct ctl_table *table, int write,
-		     void __user *buffer, size_t *lenp,
-		     loff_t *ppos);
+		     void *buffer, size_t *lenp, loff_t *ppos);
 
 struct ftrace_ops;
 
--- a/kernel/trace/ftrace.c~ftrace-let-ftrace_enable_sysctl-take-a-kernel-pointer-buffer
+++ a/kernel/trace/ftrace.c
@@ -7531,8 +7531,7 @@ static bool is_permanent_ops_registered(
 
 int
 ftrace_enable_sysctl(struct ctl_table *table, int write,
-		     void __user *buffer, size_t *lenp,
-		     loff_t *ppos)
+		     void *buffer, size_t *lenp, loff_t *ppos)
 {
 	int ret = -ENODEV;
 
_

Patches currently in -mm which might be from tklauser@distanz.ch are

ftrace-let-ftrace_enable_sysctl-take-a-kernel-pointer-buffer.patch
stackleak-let-stack_erasing_sysctl-take-a-kernel-pointer-buffer.patch