From mboxrd@z Thu Jan 1 00:00:00 1970 From: ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org (Eric W. Biederman) Subject: Re: [PATCH 18/43] userns: Convert group_info values from gid_t to kgid_t. Date: Fri, 20 Apr 2012 16:05:34 -0700 Message-ID: References: <1333862139-31737-18-git-send-email-ebiederm@xmission.com> <20120418184936.GC4984@mail.hallyn.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20120418184936.GC4984-7LNsyQBKDXoIagZqoN9o3w@public.gmane.org> (Serge E. Hallyn's message of "Wed, 18 Apr 2012 18:49:36 +0000") List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: "Serge E. Hallyn" Cc: Linux Containers , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-security-module-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Al Viro , Cyrill Gorcunov , Andrew Morton , Linus Torvalds List-Id: containers.vger.kernel.org "Serge E. Hallyn" writes: > Quoting Eric W. Beiderman (ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org): >> From: Eric W. Biederman >> >> As a first step to converting struct cred to be all kuid_t and kgid_t >> values convert the group values stored in group_info to always be >> kgid_t values. Unless user namespaces are used this change should >> have no effect. >> >> Signed-off-by: Eric W. Biederman >> --- >> arch/s390/kernel/compat_linux.c | 13 ++++++++- >> fs/nfsd/auth.c | 5 ++- >> fs/proc/array.c | 5 +++- >> include/linux/cred.h | 9 ++++--- >> kernel/groups.c | 48 +++++++++++++++++++----------------- >> kernel/uid16.c | 14 +++++++++- >> net/ipv4/ping.c | 11 ++++++-- >> net/sunrpc/auth_generic.c | 4 +- >> net/sunrpc/auth_gss/svcauth_gss.c | 7 ++++- >> net/sunrpc/auth_unix.c | 15 ++++++++--- >> net/sunrpc/svcauth_unix.c | 18 ++++++++++--- >> security/keys/permission.c | 3 +- >> 12 files changed, 103 insertions(+), 49 deletions(-) >> >> diff --git a/arch/s390/kernel/compat_linux.c b/arch/s390/kernel/compat_linux.c >> index ab64bdb..5baac18 100644 >> --- a/arch/s390/kernel/compat_linux.c >> +++ b/arch/s390/kernel/compat_linux.c >> @@ -173,11 +173,14 @@ asmlinkage long sys32_setfsgid16(u16 gid) >> >> static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info) >> { >> + struct user_namespace *user_ns = current_user_ns(); >> int i; >> u16 group; >> + kgid_t kgid; >> >> for (i = 0; i < group_info->ngroups; i++) { >> - group = (u16)GROUP_AT(group_info, i); >> + kgid = GROUP_AT(group_info, i); >> + group = (u16)from_kgid_munged(user_ns, kgid); >> if (put_user(group, grouplist+i)) >> return -EFAULT; >> } >> @@ -187,13 +190,19 @@ static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info >> >> static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist) >> { >> + struct user_namespace *user_ns = current_user_ns(); >> int i; >> u16 group; > > need > > kgid_t kgid; > > here Doh! Thank you. Now I am wondering why s390 has it's own copy of this function instead of using the version in uid16.c. >> for (i = 0; i < group_info->ngroups; i++) { >> if (get_user(group, grouplist+i)) >> return -EFAULT; >> - GROUP_AT(group_info, i) = (gid_t)group; >> + >> + kgid = make_kgid(user_ns, (gid_t)group); >> + if (!gid_valid(kgid)) >> + return -EINVAL; >> + >> + GROUP_AT(group_info, i) = kgid; >> } >> >> return 0; Eric