void sigaction_compat_abi(struct k_sigaction *act, struct k_sigaction *oact) { signal_compat_build_tests(); /* Don't leak in-kernel non-uapi flags to user-space */ if (oact) oact->sa.sa_flags &= ~(SA_IA32_ABI | SA_X32_ABI); if (!act) return; /* Don't let flags to be set from userspace */ act->sa.sa_flags &= ~(SA_IA32_ABI | SA_X32_ABI); if (in_ia32_syscall()) act->sa.sa_flags |= SA_IA32_ABI; if (in_x32_syscall()) act->sa.sa_flags |= SA_X32_ABI; }
int __copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from, bool x32_ABI) { int err = 0; signal_compat_build_tests(); if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) return -EFAULT; put_user_try { /* If you change siginfo_t structure, please make sure that this code is fixed accordingly. It should never copy any pad contained in the structure to avoid security leaks, but must copy the generic 3 ints plus the relevant union member. */ put_user_ex(from->si_signo, &to->si_signo); put_user_ex(from->si_errno, &to->si_errno); put_user_ex(from->si_code, &to->si_code); if (from->si_code < 0) { put_user_ex(from->si_pid, &to->si_pid); put_user_ex(from->si_uid, &to->si_uid); put_user_ex(ptr_to_compat(from->si_ptr), &to->si_ptr); } else { /* * First 32bits of unions are always present: * si_pid === si_band === si_tid === si_addr(LS half) */ put_user_ex(from->_sifields._pad[0], &to->_sifields._pad[0]); switch (siginfo_layout(from->si_signo, from->si_code)) { case SIL_FAULT: if (from->si_signo == SIGBUS && (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO)) put_user_ex(from->si_addr_lsb, &to->si_addr_lsb); if (from->si_signo == SIGSEGV) { if (from->si_code == SEGV_BNDERR) { compat_uptr_t lower = (unsigned long)from->si_lower; compat_uptr_t upper = (unsigned long)from->si_upper; put_user_ex(lower, &to->si_lower); put_user_ex(upper, &to->si_upper); } if (from->si_code == SEGV_PKUERR) put_user_ex(from->si_pkey, &to->si_pkey); } break; case SIL_SYS: put_user_ex(from->si_syscall, &to->si_syscall); put_user_ex(from->si_arch, &to->si_arch); break; case SIL_CHLD: if (!x32_ABI) { put_user_ex(from->si_utime, &to->si_utime); put_user_ex(from->si_stime, &to->si_stime); } else { put_user_ex(from->si_utime, &to->_sifields._sigchld_x32._utime); put_user_ex(from->si_stime, &to->_sifields._sigchld_x32._stime); } put_user_ex(from->si_status, &to->si_status); /* FALL THROUGH */ case SIL_KILL: put_user_ex(from->si_uid, &to->si_uid); break; case SIL_POLL: put_user_ex(from->si_fd, &to->si_fd); break; case SIL_TIMER: put_user_ex(from->si_overrun, &to->si_overrun); put_user_ex(ptr_to_compat(from->si_ptr), &to->si_ptr); break; case SIL_RT: put_user_ex(from->si_uid, &to->si_uid); put_user_ex(from->si_int, &to->si_int); break; } } } put_user_catch(err); return err; }
int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) { int err = 0; bool ia32 = test_thread_flag(TIF_IA32); signal_compat_build_tests(); if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) return -EFAULT; put_user_try { /* If you change siginfo_t structure, please make sure that this code is fixed accordingly. It should never copy any pad contained in the structure to avoid security leaks, but must copy the generic 3 ints plus the relevant union member. */ put_user_ex(from->si_signo, &to->si_signo); put_user_ex(from->si_errno, &to->si_errno); put_user_ex((short)from->si_code, &to->si_code); if (from->si_code < 0) { put_user_ex(from->si_pid, &to->si_pid); put_user_ex(from->si_uid, &to->si_uid); put_user_ex(ptr_to_compat(from->si_ptr), &to->si_ptr); } else { /* * First 32bits of unions are always present: * si_pid === si_band === si_tid === si_addr(LS half) */ put_user_ex(from->_sifields._pad[0], &to->_sifields._pad[0]); switch (from->si_code >> 16) { case __SI_FAULT >> 16: if (from->si_signo == SIGBUS && (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO)) put_user_ex(from->si_addr_lsb, &to->si_addr_lsb); if (from->si_signo == SIGSEGV) { if (from->si_code == SEGV_BNDERR) { compat_uptr_t lower = (unsigned long)&to->si_lower; compat_uptr_t upper = (unsigned long)&to->si_upper; put_user_ex(lower, &to->si_lower); put_user_ex(upper, &to->si_upper); } if (from->si_code == SEGV_PKUERR) put_user_ex(from->si_pkey, &to->si_pkey); } break; case __SI_SYS >> 16: put_user_ex(from->si_syscall, &to->si_syscall); put_user_ex(from->si_arch, &to->si_arch); break; case __SI_CHLD >> 16: if (ia32) { put_user_ex(from->si_utime, &to->si_utime); put_user_ex(from->si_stime, &to->si_stime); } else { put_user_ex(from->si_utime, &to->_sifields._sigchld_x32._utime); put_user_ex(from->si_stime, &to->_sifields._sigchld_x32._stime); } put_user_ex(from->si_status, &to->si_status); /* FALL THROUGH */ default: case __SI_KILL >> 16: put_user_ex(from->si_uid, &to->si_uid); break; case __SI_POLL >> 16: put_user_ex(from->si_fd, &to->si_fd); break; case __SI_TIMER >> 16: put_user_ex(from->si_overrun, &to->si_overrun); put_user_ex(ptr_to_compat(from->si_ptr), &to->si_ptr); break; /* This is not generated by the kernel as of now. */ case __SI_RT >> 16: case __SI_MESGQ >> 16: put_user_ex(from->si_uid, &to->si_uid); put_user_ex(from->si_int, &to->si_int); break; } } } put_user_catch(err); return err; }