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![Alex Dewar](/assets/img/avatar_default.png)
Convert files to use SPDX header. All files are licensed under the GPLv2. Signed-off-by: Alex Dewar <alex.dewar@gmx.co.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
287 lines
5.6 KiB
C
287 lines
5.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
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* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/ptrace.h>
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#include <sys/wait.h>
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#include <asm/unistd.h>
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#include <init.h>
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#include <longjmp.h>
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#include <os.h>
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#define ARBITRARY_ADDR -1
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#define FAILURE_PID -1
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#define STAT_PATH_LEN sizeof("/proc/#######/stat\0")
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#define COMM_SCANF "%*[^)])"
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unsigned long os_process_pc(int pid)
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{
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char proc_stat[STAT_PATH_LEN], buf[256];
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unsigned long pc = ARBITRARY_ADDR;
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int fd, err;
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sprintf(proc_stat, "/proc/%d/stat", pid);
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fd = open(proc_stat, O_RDONLY, 0);
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if (fd < 0) {
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printk(UM_KERN_ERR "os_process_pc - couldn't open '%s', "
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"errno = %d\n", proc_stat, errno);
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goto out;
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}
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CATCH_EINTR(err = read(fd, buf, sizeof(buf)));
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if (err < 0) {
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printk(UM_KERN_ERR "os_process_pc - couldn't read '%s', "
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"err = %d\n", proc_stat, errno);
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goto out_close;
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}
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os_close_file(fd);
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pc = ARBITRARY_ADDR;
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if (sscanf(buf, "%*d " COMM_SCANF " %*c %*d %*d %*d %*d %*d %*d %*d "
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"%*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d "
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"%*d %*d %*d %*d %*d %lu", &pc) != 1)
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printk(UM_KERN_ERR "os_process_pc - couldn't find pc in '%s'\n",
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buf);
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out_close:
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close(fd);
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out:
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return pc;
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}
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int os_process_parent(int pid)
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{
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char stat[STAT_PATH_LEN];
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char data[256];
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int parent = FAILURE_PID, n, fd;
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if (pid == -1)
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return parent;
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snprintf(stat, sizeof(stat), "/proc/%d/stat", pid);
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fd = open(stat, O_RDONLY, 0);
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if (fd < 0) {
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printk(UM_KERN_ERR "Couldn't open '%s', errno = %d\n", stat,
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errno);
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return parent;
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}
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CATCH_EINTR(n = read(fd, data, sizeof(data)));
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close(fd);
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if (n < 0) {
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printk(UM_KERN_ERR "Couldn't read '%s', errno = %d\n", stat,
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errno);
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return parent;
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}
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parent = FAILURE_PID;
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n = sscanf(data, "%*d " COMM_SCANF " %*c %d", &parent);
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if (n != 1)
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printk(UM_KERN_ERR "Failed to scan '%s'\n", data);
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return parent;
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}
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void os_alarm_process(int pid)
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{
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kill(pid, SIGALRM);
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}
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void os_stop_process(int pid)
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{
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kill(pid, SIGSTOP);
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}
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void os_kill_process(int pid, int reap_child)
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{
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kill(pid, SIGKILL);
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if (reap_child)
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CATCH_EINTR(waitpid(pid, NULL, __WALL));
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}
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/* Kill off a ptraced child by all means available. kill it normally first,
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* then PTRACE_KILL it, then PTRACE_CONT it in case it's in a run state from
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* which it can't exit directly.
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*/
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void os_kill_ptraced_process(int pid, int reap_child)
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{
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kill(pid, SIGKILL);
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ptrace(PTRACE_KILL, pid);
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ptrace(PTRACE_CONT, pid);
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if (reap_child)
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CATCH_EINTR(waitpid(pid, NULL, __WALL));
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}
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/* Don't use the glibc version, which caches the result in TLS. It misses some
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* syscalls, and also breaks with clone(), which does not unshare the TLS.
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*/
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int os_getpid(void)
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{
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return syscall(__NR_getpid);
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}
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int os_getpgrp(void)
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{
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return getpgrp();
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}
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int os_map_memory(void *virt, int fd, unsigned long long off, unsigned long len,
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int r, int w, int x)
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{
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void *loc;
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int prot;
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prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
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(x ? PROT_EXEC : 0);
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loc = mmap64((void *) virt, len, prot, MAP_SHARED | MAP_FIXED,
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fd, off);
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if (loc == MAP_FAILED)
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return -errno;
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return 0;
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}
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int os_protect_memory(void *addr, unsigned long len, int r, int w, int x)
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{
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int prot = ((r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
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(x ? PROT_EXEC : 0));
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if (mprotect(addr, len, prot) < 0)
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return -errno;
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return 0;
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}
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int os_unmap_memory(void *addr, int len)
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{
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int err;
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err = munmap(addr, len);
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if (err < 0)
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return -errno;
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return 0;
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}
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#ifndef MADV_REMOVE
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#define MADV_REMOVE KERNEL_MADV_REMOVE
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#endif
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int os_drop_memory(void *addr, int length)
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{
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int err;
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err = madvise(addr, length, MADV_REMOVE);
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if (err < 0)
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err = -errno;
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return err;
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}
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int __init can_drop_memory(void)
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{
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void *addr;
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int fd, ok = 0;
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printk(UM_KERN_INFO "Checking host MADV_REMOVE support...");
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fd = create_mem_file(UM_KERN_PAGE_SIZE);
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if (fd < 0) {
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printk(UM_KERN_ERR "Creating test memory file failed, "
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"err = %d\n", -fd);
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goto out;
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}
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addr = mmap64(NULL, UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
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MAP_SHARED, fd, 0);
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if (addr == MAP_FAILED) {
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printk(UM_KERN_ERR "Mapping test memory file failed, "
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"err = %d\n", -errno);
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goto out_close;
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}
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if (madvise(addr, UM_KERN_PAGE_SIZE, MADV_REMOVE) != 0) {
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printk(UM_KERN_ERR "MADV_REMOVE failed, err = %d\n", -errno);
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goto out_unmap;
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}
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printk(UM_KERN_CONT "OK\n");
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ok = 1;
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out_unmap:
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munmap(addr, UM_KERN_PAGE_SIZE);
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out_close:
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close(fd);
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out:
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return ok;
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}
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static int os_page_mincore(void *addr)
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{
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char vec[2];
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int ret;
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ret = mincore(addr, UM_KERN_PAGE_SIZE, vec);
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if (ret < 0) {
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if (errno == ENOMEM || errno == EINVAL)
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return 0;
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else
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return -errno;
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}
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return vec[0] & 1;
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}
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int os_mincore(void *addr, unsigned long len)
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{
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char *vec;
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int ret, i;
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if (len <= UM_KERN_PAGE_SIZE)
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return os_page_mincore(addr);
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vec = calloc(1, (len + UM_KERN_PAGE_SIZE - 1) / UM_KERN_PAGE_SIZE);
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if (!vec)
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return -ENOMEM;
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ret = mincore(addr, UM_KERN_PAGE_SIZE, vec);
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if (ret < 0) {
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if (errno == ENOMEM || errno == EINVAL)
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ret = 0;
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else
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ret = -errno;
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goto out;
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}
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for (i = 0; i < ((len + UM_KERN_PAGE_SIZE - 1) / UM_KERN_PAGE_SIZE); i++) {
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if (!(vec[i] & 1)) {
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ret = 0;
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goto out;
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}
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}
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ret = 1;
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out:
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free(vec);
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return ret;
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}
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void init_new_thread_signals(void)
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{
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set_handler(SIGSEGV);
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set_handler(SIGTRAP);
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set_handler(SIGFPE);
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set_handler(SIGILL);
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set_handler(SIGBUS);
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signal(SIGHUP, SIG_IGN);
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set_handler(SIGIO);
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signal(SIGWINCH, SIG_IGN);
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}
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