From: Liam Howlett <liam.howlett@oracle.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>,
"linux-m68k@lists.linux-m68k.org"
<linux-m68k@lists.linux-m68k.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Cc: Laurent Dufour <ldufour@linux.ibm.com>,
Vlastimil Babka <vbabka@suse.cz>,
Daniel Jordan <daniel.m.jordan@oracle.com>,
Michel Lespinasse <walken@google.com>
Subject: Re: [PATCH] arch/m68k/kernel/sys_m68k: Add missing mmap_read_lock() to sys_cacheflush()
Date: Thu, 8 Apr 2021 16:34:20 +0000 [thread overview]
Message-ID: <20210408163400.bcsmojb4ug7nnzwt@revolver> (raw)
In-Reply-To: <20210407200032.764445-1-Liam.Howlett@Oracle.com>
[-- Attachment #1: Type: text/plain, Size: 870 bytes --]
Forgot the fixes line.
* Liam Howlett <liam.howlett@oracle.com> [210407 16:00]:
> 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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From aeee71b15f54426f02f41a4408afbd0b5acab7ec Mon Sep 17 00:00:00 2001
From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>
Date: Wed, 7 Apr 2021 11:39:06 -0400
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.
Fixes: cd2567b6850b (m68k: call find_vma with the mmap_sem held in
sys_cacheflush())
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
next prev parent reply other threads:[~2021-04-08 16:34 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-07 20:00 [PATCH] arch/m68k/kernel/sys_m68k: Add missing mmap_read_lock() to sys_cacheflush() Liam Howlett
2021-04-08 16:34 ` Liam Howlett [this message]
2021-04-08 16:38 ` Matthew Wilcox
2021-04-12 7:24 ` Geert Uytterhoeven
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