diff options
Diffstat (limited to 'kernel/uid16.c')
| -rw-r--r-- | kernel/uid16.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/kernel/uid16.c b/kernel/uid16.c new file mode 100644 index 00000000000..f669941e8b2 --- /dev/null +++ b/kernel/uid16.c @@ -0,0 +1,196 @@ +/* + * 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 <linux/security.h> +#include <linux/syscalls.h> + +#include <asm/uaccess.h> + +asmlinkage long sys_chown16(const char __user * filename, old_uid_t user, old_gid_t group) +{ + return sys_chown(filename, low2highuid(user), low2highgid(group)); +} + +asmlinkage long sys_lchown16(const char __user * 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(low2highgid(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(low2highuid(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 __user *ruid, old_uid_t __user *euid, old_uid_t __user *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 __user *rgid, old_gid_t __user *egid, old_gid_t __user *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(low2highuid(uid)); +} + +asmlinkage long sys_setfsgid16(old_gid_t gid) +{ + return sys_setfsgid(low2highgid(gid)); +} + +static int groups16_to_user(old_gid_t __user *grouplist, + struct group_info *group_info) +{ + int i; + old_gid_t group; + + for (i = 0; i < group_info->ngroups; i++) { + group = high2lowgid(GROUP_AT(group_info, i)); + if (put_user(group, grouplist+i)) + return -EFAULT; + } + + return 0; +} + +static int groups16_from_user(struct group_info *group_info, + old_gid_t __user *grouplist) +{ + int i; + old_gid_t group; + + for (i = 0; i < group_info->ngroups; i++) { + if (get_user(group, grouplist+i)) + return -EFAULT; + GROUP_AT(group_info, i) = low2highgid(group); + } + + return 0; +} + +asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist) +{ + int i = 0; + + if (gidsetsize < 0) + return -EINVAL; + + get_group_info(current->group_info); + i = current->group_info->ngroups; + if (gidsetsize) { + if (i > gidsetsize) { + i = -EINVAL; + goto out; + } + if (groups16_to_user(grouplist, current->group_info)) { + i = -EFAULT; + goto out; + } + } +out: + put_group_info(current->group_info); + return i; +} + +asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist) +{ + struct group_info *group_info; + int retval; + + if (!capable(CAP_SETGID)) + return -EPERM; + if ((unsigned)gidsetsize > NGROUPS_MAX) + return -EINVAL; + + group_info = groups_alloc(gidsetsize); + if (!group_info) + return -ENOMEM; + retval = groups16_from_user(group_info, grouplist); + if (retval) { + put_group_info(group_info); + return retval; + } + + retval = set_current_groups(group_info); + put_group_info(group_info); + + return retval; +} + +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); +} |