lkml.org 
[lkml]   [2021]   [Apr]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] arch/m68k/kernel/sys_m68k: Add missing mmap_read_lock() to sys_cacheflush()
Date
When the superuser flushes the entire cache, the mmap_read_lock() is not
taken, but mmap_read_unlock() is called. Add the missing
mmap_read_lock() call.

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---
arch/m68k/kernel/sys_m68k.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/m68k/kernel/sys_m68k.c b/arch/m68k/kernel/sys_m68k.c
index 1c235d8f53f3..f55bdcb8e4f1 100644
--- a/arch/m68k/kernel/sys_m68k.c
+++ b/arch/m68k/kernel/sys_m68k.c
@@ -388,6 +388,8 @@ sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
ret = -EPERM;
if (!capable(CAP_SYS_ADMIN))
goto out;
+
+ mmap_read_lock(current->mm);
} else {
struct vm_area_struct *vma;

--
2.30.0
\
 
 \ /
  Last update: 2021-04-07 22:01    [W:0.073 / U:0.248 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site