uid16.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:4k
- /*
- * Wrapper functions for 16bit uid back compatibility. All nicely tied
- * together in the faint hope we can take the out in five years time.
- */
- #include <linux/mm.h>
- #include <linux/utsname.h>
- #include <linux/mman.h>
- #include <linux/smp_lock.h>
- #include <linux/notifier.h>
- #include <linux/reboot.h>
- #include <linux/prctl.h>
- #include <linux/init.h>
- #include <linux/highuid.h>
- #include <asm/uaccess.h>
- extern asmlinkage long sys_chown(const char *, uid_t,gid_t);
- extern asmlinkage long sys_lchown(const char *, uid_t,gid_t);
- extern asmlinkage long sys_fchown(unsigned int, uid_t,gid_t);
- extern asmlinkage long sys_setregid(gid_t, gid_t);
- extern asmlinkage long sys_setgid(gid_t);
- extern asmlinkage long sys_setreuid(uid_t, uid_t);
- extern asmlinkage long sys_setuid(uid_t);
- extern asmlinkage long sys_setresuid(uid_t, uid_t, uid_t);
- extern asmlinkage long sys_setresgid(gid_t, gid_t, gid_t);
- extern asmlinkage long sys_setfsuid(uid_t);
- extern asmlinkage long sys_setfsgid(gid_t);
-
- asmlinkage long sys_chown16(const char * filename, old_uid_t user, old_gid_t group)
- {
- return sys_chown(filename, low2highuid(user), low2highgid(group));
- }
- asmlinkage long sys_lchown16(const char * filename, old_uid_t user, old_gid_t group)
- {
- return sys_lchown(filename, low2highuid(user), low2highgid(group));
- }
- asmlinkage long sys_fchown16(unsigned int fd, old_uid_t user, old_gid_t group)
- {
- return sys_fchown(fd, low2highuid(user), low2highgid(group));
- }
- asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid)
- {
- return sys_setregid(low2highgid(rgid), low2highgid(egid));
- }
- asmlinkage long sys_setgid16(old_gid_t gid)
- {
- return sys_setgid((gid_t)gid);
- }
- asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid)
- {
- return sys_setreuid(low2highuid(ruid), low2highuid(euid));
- }
- asmlinkage long sys_setuid16(old_uid_t uid)
- {
- return sys_setuid((uid_t)uid);
- }
- asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid)
- {
- return sys_setresuid(low2highuid(ruid), low2highuid(euid),
- low2highuid(suid));
- }
- asmlinkage long sys_getresuid16(old_uid_t *ruid, old_uid_t *euid, old_uid_t *suid)
- {
- int retval;
- if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
- !(retval = put_user(high2lowuid(current->euid), euid)))
- retval = put_user(high2lowuid(current->suid), suid);
- return retval;
- }
- asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid)
- {
- return sys_setresgid(low2highgid(rgid), low2highgid(egid),
- low2highgid(sgid));
- }
- asmlinkage long sys_getresgid16(old_gid_t *rgid, old_gid_t *egid, old_gid_t *sgid)
- {
- int retval;
- if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
- !(retval = put_user(high2lowgid(current->egid), egid)))
- retval = put_user(high2lowgid(current->sgid), sgid);
- return retval;
- }
- asmlinkage long sys_setfsuid16(old_uid_t uid)
- {
- return sys_setfsuid((uid_t)uid);
- }
- asmlinkage long sys_setfsgid16(old_gid_t gid)
- {
- return sys_setfsgid((gid_t)gid);
- }
- asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t *grouplist)
- {
- old_gid_t groups[NGROUPS];
- int i,j;
- if (gidsetsize < 0)
- return -EINVAL;
- i = current->ngroups;
- if (gidsetsize) {
- if (i > gidsetsize)
- return -EINVAL;
- for(j=0;j<i;j++)
- groups[j] = current->groups[j];
- if (copy_to_user(grouplist, groups, sizeof(old_gid_t)*i))
- return -EFAULT;
- }
- return i;
- }
- asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t *grouplist)
- {
- old_gid_t groups[NGROUPS];
- int i;
- if (!capable(CAP_SETGID))
- return -EPERM;
- if ((unsigned) gidsetsize > NGROUPS)
- return -EINVAL;
- if (copy_from_user(groups, grouplist, gidsetsize * sizeof(old_gid_t)))
- return -EFAULT;
- for (i = 0 ; i < gidsetsize ; i++)
- current->groups[i] = (gid_t)groups[i];
- current->ngroups = gidsetsize;
- return 0;
- }
- asmlinkage long sys_getuid16(void)
- {
- return high2lowuid(current->uid);
- }
- asmlinkage long sys_geteuid16(void)
- {
- return high2lowuid(current->euid);
- }
- asmlinkage long sys_getgid16(void)
- {
- return high2lowgid(current->gid);
- }
- asmlinkage long sys_getegid16(void)
- {
- return high2lowgid(current->egid);
- }