uml: update to linux 4.4

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 48265

3 files changed, 346 insertions, 0 deletions

diff --git a/target/linux/uml/patches-4.4/100-link-libpthread.patch b/target/linux/uml/patches-4.4/100-link-libpthread.patch
new file mode 100644
index 0000000..297f6d5
--- /dev/null
+++ b/target/linux/uml/patches-4.4/100-link-libpthread.patch
@@ -0,0 +1,11 @@
+--- a/scripts/link-vmlinux.sh
++++ b/scripts/link-vmlinux.sh
+@@ -62,7 +62,7 @@
+ 			-Wl,--start-group                                    \
+ 				 ${KBUILD_VMLINUX_MAIN}                      \
+ 			-Wl,--end-group                                      \
+-			-lutil -lrt ${1}
++			-lutil -lrt -lpthread ${1}
+ 		rm -f linux
+ 	fi
+ }
diff --git a/target/linux/uml/patches-4.4/101-mconsole-exec.patch b/target/linux/uml/patches-4.4/101-mconsole-exec.patch
new file mode 100644
index 0000000..98f04f4
--- /dev/null
+++ b/target/linux/uml/patches-4.4/101-mconsole-exec.patch
@@ -0,0 +1,211 @@
+#
+# Minimalist mconsole exec patch 
+#
+# 3.10 version (with bit more synchronous behavior) by fingon at iki dot fi
+# Adaptation to kernel 3.3.8 made by David Fernández (david at dit.upm.es) for 
+# Starting point: mconsole-exec-2.6.30.patch for kernel 2.6.30
+# Author of original patch: Paolo Giarrusso, aka Blaisorblade 
+#                           (http://www.user-mode-linux.org/~blaisorblade)
+#
+# Known misfeatures:
+#
+# - If output is too long, blocks (and breaks horribly) 
+# (this misfeature from 3.10 patches, when minimalizing the patch;
+#  workaround: redirect to a shared filesystem if long output is expected)
+#
+# - Nothing useful is done with stdin
+#
+--- a/arch/um/drivers/mconsole.h
++++ b/arch/um/drivers/mconsole.h
+@@ -85,6 +85,7 @@
+ extern void mconsole_stop(struct mc_request *req);
+ extern void mconsole_go(struct mc_request *req);
+ extern void mconsole_log(struct mc_request *req);
++extern void mconsole_exec(struct mc_request *req);
+ extern void mconsole_proc(struct mc_request *req);
+ extern void mconsole_stack(struct mc_request *req);
+ 
+--- a/arch/um/drivers/mconsole_kern.c
++++ b/arch/um/drivers/mconsole_kern.c
+@@ -4,6 +4,7 @@
+  * Licensed under the GPL
+  */
+ 
++#include "linux/kmod.h"
+ #include <linux/console.h>
+ #include <linux/ctype.h>
+ #include <linux/string.h>
+@@ -24,6 +25,7 @@
+ #include <linux/fs.h>
+ #include <linux/mount.h>
+ #include <linux/file.h>
++#include <linux/completion.h>
+ #include <asm/uaccess.h>
+ #include <asm/switch_to.h>
+ 
+@@ -121,6 +123,59 @@
+ 	mconsole_reply(req, "", 0, 0);
+ }
+ 
++void mconsole_exec(struct mc_request *req)
++{
++  struct subprocess_info *sub_info;
++  int res, len;
++  struct file *out;
++  char buf[MCONSOLE_MAX_DATA];
++
++  char *envp[] = {
++    "HOME=/", "TERM=linux",
++    "PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin",
++    NULL
++  };
++  char *argv[] = {
++    "/bin/sh", "-c",
++    req->request.data + strlen("exec "),
++    NULL
++  };
++
++  sub_info = call_usermodehelper_setup("/bin/sh", argv, envp, GFP_ATOMIC, NULL, NULL, NULL);
++  if (sub_info == NULL) {
++    mconsole_reply(req, "call_usermodehelper_setup failed", 1, 0);
++    return;
++  }
++  res = call_usermodehelper_stdoutpipe(sub_info, &out);
++  if (res < 0) {
++    kfree(sub_info);
++    mconsole_reply(req, "call_usermodehelper_stdoutpipe failed", 1, 0);
++    return;
++  }
++
++  res = call_usermodehelper_exec(sub_info, UMH_WAIT_PROC);
++  if (res < 0) {
++    kfree(sub_info);
++    mconsole_reply(req, "call_usermodehelper_exec failed", 1, 0);
++    return;
++  }
++
++  for (;;) {
++    len = out->f_op->read(out, buf, sizeof(buf), &out->f_pos);
++    if (len < 0) {
++      mconsole_reply(req, "reading output failed", 1, 0);
++      break;
++    }
++    if (len == 0)
++      break;
++    mconsole_reply_len(req, buf, len, 0, 1);
++  }
++  fput(out);
++
++  mconsole_reply_len(req, NULL, 0, 0, 0);
++}
++
++
+ void mconsole_proc(struct mc_request *req)
+ {
+ 	struct vfsmount *mnt = task_active_pid_ns(current)->proc_mnt;
+@@ -187,6 +242,7 @@
+     stop - pause the UML; it will do nothing until it receives a 'go' \n\
+     go - continue the UML after a 'stop' \n\
+     log <string> - make UML enter <string> into the kernel log\n\
++    exec <string> - pass <string> to /bin/sh -c synchronously\n\
+     proc <file> - returns the contents of the UML's /proc/<file>\n\
+     stack <pid> - returns the stack of the specified pid\n\
+ "
+--- a/arch/um/drivers/mconsole_user.c
++++ b/arch/um/drivers/mconsole_user.c
+@@ -30,6 +30,7 @@
+ 	{ "stop", mconsole_stop, MCONSOLE_PROC },
+ 	{ "go", mconsole_go, MCONSOLE_INTR },
+ 	{ "log", mconsole_log, MCONSOLE_INTR },
++	{ "exec", mconsole_exec, MCONSOLE_PROC },
+ 	{ "proc", mconsole_proc, MCONSOLE_PROC },
+ 	{ "stack", mconsole_stack, MCONSOLE_INTR },
+ };
+--- a/arch/um/os-Linux/file.c
++++ b/arch/um/os-Linux/file.c
+@@ -535,6 +535,8 @@
+ 
+ 	addr.sun_family = AF_UNIX;
+ 
++	if (len > sizeof(addr.sun_path))
++		len = sizeof(addr.sun_path);
+ 	snprintf(addr.sun_path, len, "%s", file);
+ 
+ 	err = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
+--- a/include/linux/kmod.h
++++ b/include/linux/kmod.h
+@@ -62,6 +62,7 @@
+ 	int wait;
+ 	int retval;
+ 	int (*init)(struct subprocess_info *info, struct cred *new);
++	struct file *stdout;
+ 	void (*cleanup)(struct subprocess_info *info);
+ 	void *data;
+ };
+@@ -102,4 +103,6 @@
+ extern long usermodehelper_read_lock_wait(long timeout);
+ extern void usermodehelper_read_unlock(void);
+ 
++int call_usermodehelper_stdoutpipe(struct subprocess_info *sub_info, struct file **filp);
++
+ #endif /* __LINUX_KMOD_H__ */
+--- a/kernel/kmod.c
++++ b/kernel/kmod.c
+@@ -39,6 +39,7 @@
+ #include <linux/rwsem.h>
+ #include <linux/ptrace.h>
+ #include <linux/async.h>
++#include <linux/pipe_fs_i.h>
+ #include <asm/uaccess.h>
+ 
+ #include <trace/events/module.h>
+@@ -222,6 +223,28 @@
+ 	flush_signal_handlers(current, 1);
+ 	spin_unlock_irq(&current->sighand->siglock);
+ 
++	/* Install output when needed */
++	if (sub_info->stdout) {
++		struct files_struct *f = current->files;
++		struct fdtable *fdt;
++
++		sys_close(1);
++		sys_close(2);
++		get_file(sub_info->stdout);
++		fd_install(1, sub_info->stdout);
++		fd_install(2, sub_info->stdout);
++		spin_lock(&f->file_lock);
++		fdt = files_fdtable(f);
++		__set_bit(1, fdt->open_fds);
++		__clear_bit(1, fdt->close_on_exec);
++		__set_bit(2, fdt->open_fds);
++		__clear_bit(2, fdt->close_on_exec);
++		spin_unlock(&f->file_lock);
++
++		/* disallow core files */
++		current->signal->rlim[RLIMIT_CORE] = (struct rlimit){0, 0};
++	}
++
+ 	/*
+ 	 * Our parent (unbound workqueue) runs with elevated scheduling
+ 	 * priority. Avoid propagating that into the userspace child.
+@@ -540,6 +563,20 @@
+ }
+ EXPORT_SYMBOL(call_usermodehelper_setup);
+ 
++int call_usermodehelper_stdoutpipe(struct subprocess_info *sub_info,
++                                 struct file **filp)
++{
++  struct file *f[2];
++
++  if (create_pipe_files(f, 0)<0)
++    return PTR_ERR(f);
++  sub_info->stdout = f[1];
++  *filp = f[0];
++  return 0;
++}
++EXPORT_SYMBOL(call_usermodehelper_stdoutpipe);
++
++
+ /**
+  * call_usermodehelper_exec - start a usermode application
+  * @sub_info: information about the subprocessa
diff --git a/target/linux/uml/patches-4.4/102-pseudo-random-mac.patch b/target/linux/uml/patches-4.4/102-pseudo-random-mac.patch
new file mode 100644
index 0000000..57598f9
--- /dev/null
+++ b/target/linux/uml/patches-4.4/102-pseudo-random-mac.patch
@@ -0,0 +1,124 @@
+===============================================================================
+
+This patch makes MAC addresses of network interfaces predictable. In
+particular, it adds a small routine that computes MAC addresses of based on
+a SHA1 hash of the virtual machine name and interface ID.
+
+TECHNICAL INFORMATION:
+
+Applies to vanilla kernel 3.9.4.
+
+===============================================================================
+--- a/arch/um/Kconfig.net
++++ b/arch/um/Kconfig.net
+@@ -21,6 +21,19 @@
+         enable at least one of the following transport options to actually
+         make use of UML networking.
+ 
++config UML_NET_RANDOM_MAC
++	bool "Use random MAC addresses for network interfaces"
++	default n
++	depends on UML_NET
++	help
++        Virtual network devices inside a User-Mode Linux instance must be
++        assigned a MAC (Ethernet) address. If none is specified on the UML
++        command line, one must be automatically computed. If this option is
++        enabled, a randomly generated address is used. Otherwise, if this
++        option is disabled, the address is generated from a SHA1 hash of
++        the umid of the UML instance and the interface name. The latter choice
++        is useful to make MAC addresses predictable.
++
+ config UML_NET_ETHERTAP
+ 	bool "Ethertap transport"
+ 	depends on UML_NET
+--- a/arch/um/drivers/net_kern.c
++++ b/arch/um/drivers/net_kern.c
+@@ -25,6 +25,13 @@
+ #include <net_kern.h>
+ #include <net_user.h>
+ 
++#include <crypto/sha.h>
++#include <linux/string.h>
++#include <linux/crypto.h>
++#include <linux/err.h>
++#include <linux/scatterlist.h>
++#include "os.h"
++
+ #define DRIVER_NAME "uml-netdev"
+ 
+ static DEFINE_SPINLOCK(opened_lock);
+@@ -295,11 +302,47 @@
+ #endif
+ }
+ 
++#ifndef CONFIG_UML_NET_RANDOM_MAC
++
++/* Compute a SHA1 hash of the UML instance's id and
++ *  * an interface name. */
++static int compute_hash(const char *umid, const char *ifname, char *hash) {
++	char vmif[1024];
++	struct scatterlist sg;
++	struct crypto_hash *tfm;
++	struct hash_desc desc;
++
++	strcpy (vmif, umid);
++	strcat (vmif, ifname);
++
++	tfm = crypto_alloc_hash("sha1", 0, CRYPTO_ALG_ASYNC);
++	if (IS_ERR(tfm))
++		return 1;
++
++	desc.tfm = tfm;
++	desc.flags = 0;
++
++	sg_init_table(&sg, 1);
++	sg_set_buf(&sg, vmif, strlen(vmif));
++
++	if (crypto_hash_digest(&desc, &sg, strlen(vmif), hash)) {
++		crypto_free_hash(tfm);
++		return 1;
++	}
++
++	crypto_free_hash(tfm);
++
++	return 0;
++}
++
++#endif
++
+ static void setup_etheraddr(struct net_device *dev, char *str)
+ {
+ 	unsigned char *addr = dev->dev_addr;
+ 	char *end;
+ 	int i;
++	u8 hash[SHA1_DIGEST_SIZE];
+ 
+ 	if (str == NULL)
+ 		goto random;
+@@ -340,9 +383,26 @@
+ 	return;
+ 
+ random:
++#ifdef CONFIG_UML_NET_RANDOM_MAC
+ 	printk(KERN_INFO
+ 	       "Choosing a random ethernet address for device %s\n", dev->name);
+ 	eth_hw_addr_random(dev);
++#else
++	printk(KERN_INFO
++	       "Computing a digest to use as ethernet address for device %s\n", dev->name);
++	if (compute_hash(get_umid(), dev->name, hash)) {
++		printk(KERN_WARNING
++		       "Could not compute digest to use as ethernet address for device %s. "
++		       "Using random address instead.\n", dev->name);
++		random_ether_addr(addr);
++	}
++	else {
++		for (i=0; i < 6; i++)
++			addr[i] = (hash[i] + hash[i+6]) % 0x100;
++	}
++	addr [0] &= 0xfe; /* clear multicast bit */
++	addr [0] |= 0x02; /* set local assignment bit (IEEE802) */
++#endif
+ }
+ 
+ static DEFINE_SPINLOCK(devices_lock);