diff options
Diffstat (limited to 'kernel/uid16.c')
| -rw-r--r-- | kernel/uid16.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/kernel/uid16.c b/kernel/uid16.c new file mode 100644 index 0000000..67bb92c --- /dev/null +++ b/kernel/uid16.c @@ -0,0 +1,230 @@ +/* + * 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/notifier.h> +#include <linux/reboot.h> +#include <linux/prctl.h> +#include <linux/capability.h> +#include <linux/init.h> +#include <linux/highuid.h> +#include <linux/security.h> +#include <linux/syscalls.h> + +#include <asm/uaccess.h> + +SYSCALL_DEFINE3(chown16, const char __user *, filename, old_uid_t, user, old_gid_t, group) +{ + long ret = sys_chown(filename, low2highuid(user), low2highgid(group)); + /* avoid REGPARM breakage on x86: */ + asmlinkage_protect(3, ret, filename, user, group); + return ret; +} + +SYSCALL_DEFINE3(lchown16, const char __user *, filename, old_uid_t, user, old_gid_t, group) +{ + long ret = sys_lchown(filename, low2highuid(user), low2highgid(group)); + /* avoid REGPARM breakage on x86: */ + asmlinkage_protect(3, ret, filename, user, group); + return ret; +} + +SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group) +{ + long ret = sys_fchown(fd, low2highuid(user), low2highgid(group)); + /* avoid REGPARM breakage on x86: */ + asmlinkage_protect(3, ret, fd, user, group); + return ret; +} + +SYSCALL_DEFINE2(setregid16, old_gid_t, rgid, old_gid_t, egid) +{ + long ret = sys_setregid(low2highgid(rgid), low2highgid(egid)); + /* avoid REGPARM breakage on x86: */ + asmlinkage_protect(2, ret, rgid, egid); + return ret; +} + +SYSCALL_DEFINE1(setgid16, old_gid_t, gid) +{ + long ret = sys_setgid(low2highgid(gid)); + /* avoid REGPARM breakage on x86: */ + asmlinkage_protect(1, ret, gid); + return ret; +} + +SYSCALL_DEFINE2(setreuid16, old_uid_t, ruid, old_uid_t, euid) +{ + long ret = sys_setreuid(low2highuid(ruid), low2highuid(euid)); + /* avoid REGPARM breakage on x86: */ + asmlinkage_protect(2, ret, ruid, euid); + return ret; +} + +SYSCALL_DEFINE1(setuid16, old_uid_t, uid) +{ + long ret = sys_setuid(low2highuid(uid)); + /* avoid REGPARM breakage on x86: */ + asmlinkage_protect(1, ret, uid); + return ret; +} + +SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid) +{ + long ret = sys_setresuid(low2highuid(ruid), low2highuid(euid), + low2highuid(suid)); + /* avoid REGPARM breakage on x86: */ + asmlinkage_protect(3, ret, ruid, euid, suid); + return ret; +} + +SYSCALL_DEFINE3(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; +} + +SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid) +{ + long ret = sys_setresgid(low2highgid(rgid), low2highgid(egid), + low2highgid(sgid)); + /* avoid REGPARM breakage on x86: */ + asmlinkage_protect(3, ret, rgid, egid, sgid); + return ret; +} + + +SYSCALL_DEFINE3(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; +} + +SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid) +{ + long ret = sys_setfsuid(low2highuid(uid)); + /* avoid REGPARM breakage on x86: */ + asmlinkage_protect(1, ret, uid); + return ret; +} + +SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid) +{ + long ret = sys_setfsgid(low2highgid(gid)); + /* avoid REGPARM breakage on x86: */ + asmlinkage_protect(1, ret, gid); + return ret; +} + +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; +} + +SYSCALL_DEFINE2(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; +} + +SYSCALL_DEFINE2(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; +} + +SYSCALL_DEFINE0(getuid16) +{ + return high2lowuid(current->uid); +} + +SYSCALL_DEFINE0(geteuid16) +{ + return high2lowuid(current->euid); +} + +SYSCALL_DEFINE0(getgid16) +{ + return high2lowgid(current->gid); +} + +SYSCALL_DEFINE0(getegid16) +{ + return high2lowgid(current->egid); +} |
