linux-kernel - [PATCH 16/17] staging: lustre: hsm: permission checks for HSM ioctl operations

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Message-Id: <1460294020-2111-17-git-send-email-jsimmons@infradead.org>
Date:	Sun, 10 Apr 2016 09:13:39 -0400
From:	James Simmons <jsimmons@...radead.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org,
	Andreas Dilger <andreas.dilger@...el.com>,
	Oleg Drokin <oleg.drokin@...el.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lustre Development List <lustre-devel@...ts.lustre.org>,
	"John L. Hammond" <john.hammond@...el.com>,
	James Simmons <jsimmons@...radead.org>
Subject: [PATCH 16/17] staging: lustre: hsm: permission checks for HSM ioctl operations

From: John L. Hammond <john.hammond@...el.com>

In the LL_IOC_HSM_CT_START case of ll_dir_ioctl() require
CAP_SYS_ADMIN, since the local handler for this ioctl may modify the
global KUC table.

Signed-off-by: John L. Hammond <john.hammond@...el.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3866
Reviewed-on: http://review.whamcloud.com/7565
Reviewed-by: Aurelien Degremont <aurelien.degremont@....fr>
Reviewed-by: Faccini Bruno <bruno.faccini@...el.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@...el.com>
Reviewed-by: Oleg Drokin <oleg.drokin@...el.com>
Signed-off-by: James Simmons <jsimmons@...radead.org>
---
 drivers/staging/lustre/lustre/llite/dir.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/lustre/lustre/llite/dir.c b/drivers/staging/lustre/lustre/llite/dir.c
index 45bdf8f..94f3800 100644
--- a/drivers/staging/lustre/lustre/llite/dir.c
+++ b/drivers/staging/lustre/lustre/llite/dir.c
@@ -1844,6 +1844,9 @@ out_quotactl:
 		return rc;
 	}
 	case LL_IOC_HSM_CT_START:
+		if (!capable(CFS_CAP_SYS_ADMIN))
+			return -EPERM;
+
 		rc = copy_and_ioctl(cmd, sbi->ll_md_exp, (void __user *)arg,
 				    sizeof(struct lustre_kernelcomm));
 		return rc;
-- 
1.7.1