s390: use generic UID16 implementation
s390 has an almost identical copy of the code in kernel/uid16.c. The problem here is that it requires calling the regular system calls, which the generic implementation handles correctly, but the internal interfaces are not declared in a global header for this. The best way forward here seems to be to just use the generic code and delete the s390 specific implementation. I keep the changes to uapi/asm/posix_types.h inside of an #ifdef check so user space does not observe any changes. As some of the system calls pass pointers, we also need wrappers in compat_wrapper.c, which I add for all calls with at least one argument. All those wrappers can be removed in a later step. Link: https://lore.kernel.org/lkml/20190116131527.2071570-4-arnd@arndb.de Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Arnd Bergmann
Martin Schwidefsky
Родитель
58fa4a410f
Коммит
fef747bab3
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@ -379,6 +379,7 @@ config COMPAT
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select COMPAT_BINFMT_ELF if BINFMT_ELF
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select ARCH_WANT_OLD_COMPAT_IPC
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select COMPAT_OLD_SIGACTION
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select HAVE_UID16
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depends on MULTIUSER
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help
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Select this option if you want to enable your system kernel to
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@ -20,6 +20,12 @@ typedef long __kernel_ssize_t;
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typedef unsigned short __kernel_old_dev_t;
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#define __kernel_old_dev_t __kernel_old_dev_t
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#ifdef __KERNEL__
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typedef unsigned short __kernel_old_uid_t;
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typedef unsigned short __kernel_old_gid_t;
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#define __kernel_old_uid_t __kernel_old_uid_t
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#endif
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#ifndef __s390x__
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typedef unsigned long __kernel_ino_t;
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@ -34,7 +34,6 @@
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#include <linux/stat.h>
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#include <linux/filter.h>
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#include <linux/highmem.h>
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#include <linux/highuid.h>
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#include <linux/mman.h>
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#include <linux/ipv6.h>
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#include <linux/in.h>
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@ -58,238 +57,6 @@
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#include "compat_linux.h"
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/* For this source file, we want overflow handling. */
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#undef high2lowuid
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#undef high2lowgid
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#undef low2highuid
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#undef low2highgid
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#undef SET_UID16
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#undef SET_GID16
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#undef NEW_TO_OLD_UID
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#undef NEW_TO_OLD_GID
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#undef SET_OLDSTAT_UID
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#undef SET_OLDSTAT_GID
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#undef SET_STAT_UID
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#undef SET_STAT_GID
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#define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
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#define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
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#define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
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#define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
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#define SET_UID16(var, uid) var = high2lowuid(uid)
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#define SET_GID16(var, gid) var = high2lowgid(gid)
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#define NEW_TO_OLD_UID(uid) high2lowuid(uid)
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#define NEW_TO_OLD_GID(gid) high2lowgid(gid)
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#define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
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#define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
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#define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
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#define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
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COMPAT_SYSCALL_DEFINE3(s390_chown16, const char __user *, filename,
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u16, user, u16, group)
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{
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return ksys_chown(filename, low2highuid(user), low2highgid(group));
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}
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COMPAT_SYSCALL_DEFINE3(s390_lchown16, const char __user *,
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filename, u16, user, u16, group)
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{
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return ksys_lchown(filename, low2highuid(user), low2highgid(group));
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}
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COMPAT_SYSCALL_DEFINE3(s390_fchown16, unsigned int, fd, u16, user, u16, group)
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{
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return ksys_fchown(fd, low2highuid(user), low2highgid(group));
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}
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COMPAT_SYSCALL_DEFINE2(s390_setregid16, u16, rgid, u16, egid)
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{
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return sys_setregid(low2highgid(rgid), low2highgid(egid));
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}
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COMPAT_SYSCALL_DEFINE1(s390_setgid16, u16, gid)
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{
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return sys_setgid(low2highgid(gid));
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}
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COMPAT_SYSCALL_DEFINE2(s390_setreuid16, u16, ruid, u16, euid)
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{
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return sys_setreuid(low2highuid(ruid), low2highuid(euid));
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}
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COMPAT_SYSCALL_DEFINE1(s390_setuid16, u16, uid)
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{
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return sys_setuid(low2highuid(uid));
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}
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COMPAT_SYSCALL_DEFINE3(s390_setresuid16, u16, ruid, u16, euid, u16, suid)
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{
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return sys_setresuid(low2highuid(ruid), low2highuid(euid),
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low2highuid(suid));
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}
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COMPAT_SYSCALL_DEFINE3(s390_getresuid16, u16 __user *, ruidp,
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u16 __user *, euidp, u16 __user *, suidp)
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{
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const struct cred *cred = current_cred();
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int retval;
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u16 ruid, euid, suid;
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ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid));
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euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid));
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suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid));
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if (!(retval = put_user(ruid, ruidp)) &&
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!(retval = put_user(euid, euidp)))
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retval = put_user(suid, suidp);
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return retval;
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}
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COMPAT_SYSCALL_DEFINE3(s390_setresgid16, u16, rgid, u16, egid, u16, sgid)
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{
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return sys_setresgid(low2highgid(rgid), low2highgid(egid),
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low2highgid(sgid));
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}
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COMPAT_SYSCALL_DEFINE3(s390_getresgid16, u16 __user *, rgidp,
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u16 __user *, egidp, u16 __user *, sgidp)
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{
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const struct cred *cred = current_cred();
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int retval;
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u16 rgid, egid, sgid;
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rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid));
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egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid));
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sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid));
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if (!(retval = put_user(rgid, rgidp)) &&
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!(retval = put_user(egid, egidp)))
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retval = put_user(sgid, sgidp);
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return retval;
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}
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COMPAT_SYSCALL_DEFINE1(s390_setfsuid16, u16, uid)
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{
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return sys_setfsuid(low2highuid(uid));
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}
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COMPAT_SYSCALL_DEFINE1(s390_setfsgid16, u16, gid)
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{
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return sys_setfsgid(low2highgid(gid));
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}
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static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
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{
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struct user_namespace *user_ns = current_user_ns();
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int i;
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u16 group;
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kgid_t kgid;
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for (i = 0; i < group_info->ngroups; i++) {
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kgid = group_info->gid[i];
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group = (u16)from_kgid_munged(user_ns, kgid);
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if (put_user(group, grouplist+i))
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return -EFAULT;
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}
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return 0;
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}
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static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
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{
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struct user_namespace *user_ns = current_user_ns();
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int i;
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u16 group;
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kgid_t kgid;
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for (i = 0; i < group_info->ngroups; i++) {
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if (get_user(group, grouplist+i))
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return -EFAULT;
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kgid = make_kgid(user_ns, (gid_t)group);
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if (!gid_valid(kgid))
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return -EINVAL;
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group_info->gid[i] = kgid;
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}
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return 0;
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}
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COMPAT_SYSCALL_DEFINE2(s390_getgroups16, int, gidsetsize, u16 __user *, grouplist)
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{
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const struct cred *cred = current_cred();
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int i;
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if (gidsetsize < 0)
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return -EINVAL;
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get_group_info(cred->group_info);
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i = cred->group_info->ngroups;
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if (gidsetsize) {
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if (i > gidsetsize) {
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i = -EINVAL;
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goto out;
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}
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if (groups16_to_user(grouplist, cred->group_info)) {
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i = -EFAULT;
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goto out;
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}
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}
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out:
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put_group_info(cred->group_info);
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return i;
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}
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COMPAT_SYSCALL_DEFINE2(s390_setgroups16, int, gidsetsize, u16 __user *, grouplist)
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{
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struct group_info *group_info;
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int retval;
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if (!may_setgroups())
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return -EPERM;
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if ((unsigned)gidsetsize > NGROUPS_MAX)
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return -EINVAL;
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group_info = groups_alloc(gidsetsize);
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if (!group_info)
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return -ENOMEM;
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retval = groups16_from_user(group_info, grouplist);
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if (retval) {
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put_group_info(group_info);
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return retval;
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}
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groups_sort(group_info);
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retval = set_current_groups(group_info);
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put_group_info(group_info);
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return retval;
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}
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COMPAT_SYSCALL_DEFINE0(s390_getuid16)
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{
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return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));
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}
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COMPAT_SYSCALL_DEFINE0(s390_geteuid16)
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{
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return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
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}
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COMPAT_SYSCALL_DEFINE0(s390_getgid16)
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{
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return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
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}
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COMPAT_SYSCALL_DEFINE0(s390_getegid16)
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{
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return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));
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}
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#ifdef CONFIG_SYSVIPC
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COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, compat_ulong_t, second,
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compat_ulong_t, third, compat_uptr_t, ptr)
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@ -184,3 +184,18 @@ COMPAT_SYSCALL_WRAP5(statx, int, dfd, const char __user *, path, unsigned, flags
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COMPAT_SYSCALL_WRAP4(s390_sthyi, unsigned long, code, void __user *, info, u64 __user *, rc, unsigned long, flags);
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COMPAT_SYSCALL_WRAP5(kexec_file_load, int, kernel_fd, int, initrd_fd, unsigned long, cmdline_len, const char __user *, cmdline_ptr, unsigned long, flags)
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COMPAT_SYSCALL_WRAP4(rseq, struct rseq __user *, rseq, u32, rseq_len, int, flags, u32, sig)
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COMPAT_SYSCALL_WRAP3(chown16, const char __user *, filename, u16, user, u16, group);
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COMPAT_SYSCALL_WRAP3(lchown16, const char __user *, filename, u16, user, u16, group);
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COMPAT_SYSCALL_WRAP3(fchown16, unsigned int, fd, u16, user, u16, group);
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COMPAT_SYSCALL_WRAP2(setregid16, u16, rgid, u16, egid);
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COMPAT_SYSCALL_WRAP1(setgid16, u16, gid);
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COMPAT_SYSCALL_WRAP2(setreuid16, u16, ruid, u16, euid);
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COMPAT_SYSCALL_WRAP1(setuid16, u16, uid);
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COMPAT_SYSCALL_WRAP3(setresuid16, u16, ruid, u16, euid, u16, suid);
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COMPAT_SYSCALL_WRAP3(getresuid16, u16 __user *, ruidp, u16 __user *, euidp, u16 __user *, suidp);
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COMPAT_SYSCALL_WRAP3(setresgid16, u16, rgid, u16, egid, u16, sgid);
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COMPAT_SYSCALL_WRAP3(getresgid16, u16 __user *, rgidp, u16 __user *, egidp, u16 __user *, sgidp);
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COMPAT_SYSCALL_WRAP1(setfsuid16, u16, uid);
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COMPAT_SYSCALL_WRAP1(setfsgid16, u16, gid);
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COMPAT_SYSCALL_WRAP2(getgroups16, int, gidsetsize, u16 __user *, grouplist);
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COMPAT_SYSCALL_WRAP2(setgroups16, int, gidsetsize, u16 __user *, grouplist);
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@ -23,13 +23,13 @@
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13 32 time - compat_sys_time
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14 common mknod sys_mknod compat_sys_mknod
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15 common chmod sys_chmod compat_sys_chmod
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16 32 lchown - compat_sys_s390_lchown16
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16 32 lchown - compat_sys_lchown16
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19 common lseek sys_lseek compat_sys_lseek
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20 common getpid sys_getpid sys_getpid
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21 common mount sys_mount compat_sys_mount
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22 common umount sys_oldumount compat_sys_oldumount
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23 32 setuid - compat_sys_s390_setuid16
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24 32 getuid - compat_sys_s390_getuid16
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23 32 setuid - compat_sys_setuid16
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24 32 getuid - sys_getuid16
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25 32 stime - compat_sys_stime
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26 common ptrace sys_ptrace compat_sys_ptrace
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27 common alarm sys_alarm sys_alarm
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@ -46,11 +46,11 @@
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42 common pipe sys_pipe compat_sys_pipe
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43 common times sys_times compat_sys_times
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45 common brk sys_brk compat_sys_brk
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46 32 setgid - compat_sys_s390_setgid16
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47 32 getgid - compat_sys_s390_getgid16
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46 32 setgid - compat_sys_setgid16
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47 32 getgid - sys_getgid16
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48 common signal sys_signal compat_sys_signal
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49 32 geteuid - compat_sys_s390_geteuid16
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50 32 getegid - compat_sys_s390_getegid16
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49 32 geteuid - sys_geteuid16
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50 32 getegid - sys_getegid16
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51 common acct sys_acct compat_sys_acct
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52 common umount2 sys_umount compat_sys_umount
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54 common ioctl sys_ioctl compat_sys_ioctl
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|
@ -64,8 +64,8 @@
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65 common getpgrp sys_getpgrp sys_getpgrp
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66 common setsid sys_setsid sys_setsid
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67 common sigaction sys_sigaction compat_sys_sigaction
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70 32 setreuid - compat_sys_s390_setreuid16
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71 32 setregid - compat_sys_s390_setregid16
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70 32 setreuid - compat_sys_setreuid16
|
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71 32 setregid - compat_sys_setregid16
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72 common sigsuspend sys_sigsuspend compat_sys_sigsuspend
|
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73 common sigpending sys_sigpending compat_sys_sigpending
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74 common sethostname sys_sethostname compat_sys_sethostname
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|
|
@ -74,8 +74,8 @@
|
|||
77 common getrusage sys_getrusage compat_sys_getrusage
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78 common gettimeofday sys_gettimeofday compat_sys_gettimeofday
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79 common settimeofday sys_settimeofday compat_sys_settimeofday
|
||||
80 32 getgroups - compat_sys_s390_getgroups16
|
||||
81 32 setgroups - compat_sys_s390_setgroups16
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||||
80 32 getgroups - compat_sys_getgroups16
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81 32 setgroups - compat_sys_setgroups16
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||||
83 common symlink sys_symlink compat_sys_symlink
|
||||
85 common readlink sys_readlink compat_sys_readlink
|
||||
86 common uselib sys_uselib compat_sys_uselib
|
||||
|
|
@ -87,7 +87,7 @@
|
|||
92 common truncate sys_truncate compat_sys_truncate
|
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93 common ftruncate sys_ftruncate compat_sys_ftruncate
|
||||
94 common fchmod sys_fchmod sys_fchmod
|
||||
95 32 fchown - compat_sys_s390_fchown16
|
||||
95 32 fchown - compat_sys_fchown16
|
||||
96 common getpriority sys_getpriority sys_getpriority
|
||||
97 common setpriority sys_setpriority sys_setpriority
|
||||
99 common statfs sys_statfs compat_sys_statfs
|
||||
|
|
@ -126,8 +126,8 @@
|
|||
135 common sysfs sys_sysfs compat_sys_sysfs
|
||||
136 common personality sys_s390_personality sys_s390_personality
|
||||
137 common afs_syscall - -
|
||||
138 32 setfsuid - compat_sys_s390_setfsuid16
|
||||
139 32 setfsgid - compat_sys_s390_setfsgid16
|
||||
138 32 setfsuid - compat_sys_setfsuid16
|
||||
139 32 setfsgid - compat_sys_setfsgid16
|
||||
140 32 _llseek - compat_sys_llseek
|
||||
141 common getdents sys_getdents compat_sys_getdents
|
||||
142 32 _newselect - compat_sys_select
|
||||
|
|
@ -153,13 +153,13 @@
|
|||
161 common sched_rr_get_interval sys_sched_rr_get_interval compat_sys_sched_rr_get_interval
|
||||
162 common nanosleep sys_nanosleep compat_sys_nanosleep
|
||||
163 common mremap sys_mremap compat_sys_mremap
|
||||
164 32 setresuid - compat_sys_s390_setresuid16
|
||||
165 32 getresuid - compat_sys_s390_getresuid16
|
||||
164 32 setresuid - compat_sys_setresuid16
|
||||
165 32 getresuid - compat_sys_getresuid16
|
||||
167 common query_module - -
|
||||
168 common poll sys_poll compat_sys_poll
|
||||
169 common nfsservctl - -
|
||||
170 32 setresgid - compat_sys_s390_setresgid16
|
||||
171 32 getresgid - compat_sys_s390_getresgid16
|
||||
170 32 setresgid - compat_sys_setresgid16
|
||||
171 32 getresgid - compat_sys_getresgid16
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||||
172 common prctl sys_prctl compat_sys_prctl
|
||||
173 common rt_sigreturn sys_rt_sigreturn compat_sys_rt_sigreturn
|
||||
174 common rt_sigaction sys_rt_sigaction compat_sys_rt_sigaction
|
||||
|
|
@ -170,7 +170,7 @@
|
|||
179 common rt_sigsuspend sys_rt_sigsuspend compat_sys_rt_sigsuspend
|
||||
180 common pread64 sys_pread64 compat_sys_s390_pread64
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||||
181 common pwrite64 sys_pwrite64 compat_sys_s390_pwrite64
|
||||
182 32 chown - compat_sys_s390_chown16
|
||||
182 32 chown - compat_sys_chown16
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||||
183 common getcwd sys_getcwd compat_sys_getcwd
|
||||
184 common capget sys_capget compat_sys_capget
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185 common capset sys_capset compat_sys_capset
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||||
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