Message ID | 1449523289-144238-3-git-send-email-seth.forshee@canonical.com |
---|---|
State | Superseded |
Headers | show
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[199.87.125.144]) by smtp.gmail.com with ESMTPSA id c92sm229435iod.0.2015.12.07.13.23.17 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Mon, 07 Dec 2015 13:23:17 -0800 (PST) From: Seth Forshee <seth.forshee@canonical.com> To: "Eric W. Biederman" <ebiederm@xmission.com>, Alexander Viro <viro@zeniv.linux.org.uk> Subject: [PATCH v2 02/18] block_dev: Check permissions towards block device inode when mounting Date: Mon, 7 Dec 2015 15:21:11 -0600 Message-Id: <1449523289-144238-3-git-send-email-seth.forshee@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1449523289-144238-1-git-send-email-seth.forshee@canonical.com> References: <1449523289-144238-1-git-send-email-seth.forshee@canonical.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20151207_132336_750899_FBEB4EA5 X-CRM114-Status: UNSURE ( 9.25 ) X-CRM114-Notice: Please train this message. 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diff --git a/fs/block_dev.c b/fs/block_dev.c index 3ebbde85d898..4fdb6ab59816 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1424,9 +1424,14 @@ struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, void *holder) { struct block_device *bdev; + int perm = 0; int err; - bdev = lookup_bdev(path, 0); + if (mode & FMODE_READ) + perm |= MAY_READ; + if (mode & FMODE_WRITE) + perm |= MAY_WRITE; + bdev = lookup_bdev(path, perm); if (IS_ERR(bdev)) return bdev;