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Date: Mon, 26 Aug 2013 09:50:42 -0700
From: ebiederm@...ssion.com (Eric W. Biederman)
To: Djalal Harouni <tixxdz@...ndz.org>
Cc: Al Viro <viro@...iv.linux.org.uk>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH 2/2] procfs: restore 0400 permissions on /proc/*/pagemap
Djalal Harouni <tixxdz@...ndz.org> writes:
> Do not give an fd on privileged /proc/*/pagemap files for free.
The same objections apply to this patch as it's predecessor so I won't
repeat them.
Eric
> Restore the previous 0400 mode
>
> Signed-off-by: Djalal Harouni <tixxdz@...ndz.org>
> ---
> fs/proc/base.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/proc/base.c b/fs/proc/base.c
> index 6b162cd..93a1c89 100644
> --- a/fs/proc/base.c
> +++ b/fs/proc/base.c
> @@ -2605,7 +2605,7 @@ static const struct pid_entry tgid_base_stuff[] = {
> #ifdef CONFIG_PROC_PAGE_MONITOR
> REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
> REG("smaps", S_IRUGO, proc_pid_smaps_operations),
> - REG("pagemap", S_IRUGO, proc_pagemap_operations),
> + REG("pagemap", S_IRUSR, proc_pagemap_operations),
> #endif
> #ifdef CONFIG_SECURITY
> DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
> @@ -2943,7 +2943,7 @@ static const struct pid_entry tid_base_stuff[] = {
> #ifdef CONFIG_PROC_PAGE_MONITOR
> REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
> REG("smaps", S_IRUGO, proc_tid_smaps_operations),
> - REG("pagemap", S_IRUGO, proc_pagemap_operations),
> + REG("pagemap", S_IRUSR, proc_pagemap_operations),
> #endif
> #ifdef CONFIG_SECURITY
> DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
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