mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 20:56:40 +07:00
5a7b46b369
Those also break userland regs like following. 00000000 <sys_chown16>: 0: 0f b7 44 24 0c movzwl 0xc(%esp),%eax 5: 83 ca ff or $0xffffffff,%edx 8: 0f b7 4c 24 08 movzwl 0x8(%esp),%ecx d: 66 83 f8 ff cmp $0xffffffff,%ax 11: 0f 44 c2 cmove %edx,%eax 14: 66 83 f9 ff cmp $0xffffffff,%cx 18: 0f 45 d1 cmovne %ecx,%edx 1b: 89 44 24 0c mov %eax,0xc(%esp) 1f: 89 54 24 08 mov %edx,0x8(%esp) 23: e9 fc ff ff ff jmp 24 <sys_chown16+0x24> where the tailcall at the end overwrites the incoming stack-frame. Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> [ I would _really_ like to have a way to tell gcc about calling conventions. The "prevent_tail_call()" macro is pretty ugly ] Signed-off-by: Linus Torvalds <torvalds@osdl.org>
231 lines
5.1 KiB
C
231 lines
5.1 KiB
C
/*
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* Wrapper functions for 16bit uid back compatibility. All nicely tied
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* together in the faint hope we can take the out in five years time.
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*/
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#include <linux/mm.h>
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#include <linux/utsname.h>
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#include <linux/mman.h>
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#include <linux/smp_lock.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/prctl.h>
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#include <linux/capability.h>
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#include <linux/init.h>
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#include <linux/highuid.h>
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#include <linux/security.h>
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#include <linux/syscalls.h>
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#include <asm/uaccess.h>
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asmlinkage long sys_chown16(const char __user * filename, old_uid_t user, old_gid_t group)
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{
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long ret = sys_chown(filename, low2highuid(user), low2highgid(group));
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/* avoid REGPARM breakage on x86: */
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prevent_tail_call(ret);
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return ret;
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}
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asmlinkage long sys_lchown16(const char __user * filename, old_uid_t user, old_gid_t group)
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{
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long ret = sys_lchown(filename, low2highuid(user), low2highgid(group));
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/* avoid REGPARM breakage on x86: */
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prevent_tail_call(ret);
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return ret;
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}
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asmlinkage long sys_fchown16(unsigned int fd, old_uid_t user, old_gid_t group)
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{
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long ret = sys_fchown(fd, low2highuid(user), low2highgid(group));
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/* avoid REGPARM breakage on x86: */
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prevent_tail_call(ret);
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return ret;
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}
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asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid)
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{
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long ret = sys_setregid(low2highgid(rgid), low2highgid(egid));
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/* avoid REGPARM breakage on x86: */
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prevent_tail_call(ret);
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return ret;
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}
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asmlinkage long sys_setgid16(old_gid_t gid)
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{
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long ret = sys_setgid(low2highgid(gid));
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/* avoid REGPARM breakage on x86: */
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prevent_tail_call(ret);
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return ret;
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}
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asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid)
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{
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long ret = sys_setreuid(low2highuid(ruid), low2highuid(euid));
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/* avoid REGPARM breakage on x86: */
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prevent_tail_call(ret);
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return ret;
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}
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asmlinkage long sys_setuid16(old_uid_t uid)
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{
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long ret = sys_setuid(low2highuid(uid));
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/* avoid REGPARM breakage on x86: */
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prevent_tail_call(ret);
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return ret;
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}
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asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid)
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{
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long ret = sys_setresuid(low2highuid(ruid), low2highuid(euid),
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low2highuid(suid));
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/* avoid REGPARM breakage on x86: */
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prevent_tail_call(ret);
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return ret;
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}
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asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid)
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{
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int retval;
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if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
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!(retval = put_user(high2lowuid(current->euid), euid)))
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retval = put_user(high2lowuid(current->suid), suid);
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return retval;
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}
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asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid)
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{
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long ret = sys_setresgid(low2highgid(rgid), low2highgid(egid),
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low2highgid(sgid));
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/* avoid REGPARM breakage on x86: */
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prevent_tail_call(ret);
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return ret;
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}
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asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid)
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{
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int retval;
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if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
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!(retval = put_user(high2lowgid(current->egid), egid)))
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retval = put_user(high2lowgid(current->sgid), sgid);
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return retval;
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}
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asmlinkage long sys_setfsuid16(old_uid_t uid)
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{
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long ret = sys_setfsuid(low2highuid(uid));
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/* avoid REGPARM breakage on x86: */
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prevent_tail_call(ret);
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return ret;
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}
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asmlinkage long sys_setfsgid16(old_gid_t gid)
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{
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long ret = sys_setfsgid(low2highgid(gid));
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/* avoid REGPARM breakage on x86: */
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prevent_tail_call(ret);
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return ret;
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}
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static int groups16_to_user(old_gid_t __user *grouplist,
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struct group_info *group_info)
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{
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int i;
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old_gid_t group;
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for (i = 0; i < group_info->ngroups; i++) {
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group = high2lowgid(GROUP_AT(group_info, i));
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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,
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old_gid_t __user *grouplist)
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{
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int i;
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old_gid_t group;
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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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GROUP_AT(group_info, i) = low2highgid(group);
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}
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return 0;
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}
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asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist)
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{
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int i = 0;
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if (gidsetsize < 0)
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return -EINVAL;
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get_group_info(current->group_info);
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i = current->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, current->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(current->group_info);
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return i;
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}
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asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __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 (!capable(CAP_SETGID))
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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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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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asmlinkage long sys_getuid16(void)
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{
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return high2lowuid(current->uid);
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}
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asmlinkage long sys_geteuid16(void)
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{
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return high2lowuid(current->euid);
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}
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asmlinkage long sys_getgid16(void)
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{
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return high2lowgid(current->gid);
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}
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asmlinkage long sys_getegid16(void)
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{
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return high2lowgid(current->egid);
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}
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