Messages in this thread Patch in this message | | | From | Liam Howlett <> | Subject | [PATCH] arch/m68k/kernel/sys_m68k: Add missing mmap_read_lock() to sys_cacheflush() | Date | Wed, 7 Apr 2021 20:00:45 +0000 |
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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
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