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Message-ID: <20210408163400.bcsmojb4ug7nnzwt@revolver>
Date: Thu, 8 Apr 2021 16:34:20 +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>,
"linux-mm@...ck.org" <linux-mm@...ck.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>
Subject: Re: [PATCH] arch/m68k/kernel/sys_m68k: Add missing mmap_read_lock()
to sys_cacheflush()
Forgot the fixes line.
* Liam Howlett <liam.howlett@...cle.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@...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
View attachment "0001-arch-m68k-kernel-sys_m68k-Add-missing-mmap_read_lock.patch" of type "text/x-diff" (1086 bytes)
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