linux-kernel - [PATCH] arch/m68k/kernel/sys_m68k: Add missing mmap_read_lock() to sys

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Message-ID: <20210407200032.764445-1-Liam.Howlett@Oracle.com>
Date:   Wed, 7 Apr 2021 20:00:45 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        "linux-m68k@...ts.linux-m68k.org" <linux-m68k@...ts.linux-m68k.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Laurent Dufour <ldufour@...ux.ibm.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Michel Lespinasse <walken@...gle.com>,
        Liam Howlett <liam.howlett@...cle.com>
Subject: [PATCH] arch/m68k/kernel/sys_m68k: Add missing mmap_read_lock() to
 sys_cacheflush()

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@...cle.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