From mboxrd@z Thu Jan 1 00:00:00 1970 From: mic@digikod.net (=?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?=) Date: Tue, 27 Feb 2018 01:41:12 +0100 Subject: [PATCH bpf-next v8 02/11] fs, security: Add a new file access type: MAY_CHROOT In-Reply-To: <20180227004121.3633-1-mic@digikod.net> References: <20180227004121.3633-1-mic@digikod.net> Message-ID: <20180227004121.3633-3-mic@digikod.net> To: linux-security-module@vger.kernel.org List-Id: linux-security-module.vger.kernel.org For compatibility reason, MAY_CHROOT is always set with MAY_CHDIR. However, this new flag enable to differentiate a chdir form a chroot. This is needed for the Landlock LSM to be able to evaluate a new root directory. Signed-off-by: Micka?l Sala?n Cc: Alexander Viro Cc: Casey Schaufler Cc: James Morris Cc: John Johansen Cc: Kees Cook Cc: Paul Moore Cc: "Serge E. Hallyn" Cc: Stephen Smalley Cc: Tetsuo Handa Cc: linux-fsdevel at vger.kernel.org --- fs/open.c | 3 ++- include/linux/fs.h | 1 + 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/open.c b/fs/open.c index 7ea118471dce..084d147c0e96 100644 --- a/fs/open.c +++ b/fs/open.c @@ -489,7 +489,8 @@ SYSCALL_DEFINE1(chroot, const char __user *, filename) if (error) goto out; - error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR); + error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR | + MAY_CHROOT); if (error) goto dput_and_out; diff --git a/include/linux/fs.h b/include/linux/fs.h index 2a815560fda0..67c62374446c 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -90,6 +90,7 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset, #define MAY_CHDIR 0x00000040 /* called from RCU mode, don't block */ #define MAY_NOT_BLOCK 0x00000080 +#define MAY_CHROOT 0x00000100 /* * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond -- 2.16.2 -- To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html