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@@ -0,0 +1,213 @@
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+#
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+# Minimalist mconsole exec patch
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+#
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+# 3.10 version (with bit more synchronous behavior) by fingon at iki dot fi
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+# Adaptation to kernel 3.3.8 made by David Fernández (david at dit.upm.es) for
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+# Starting point: mconsole-exec-2.6.30.patch for kernel 2.6.30
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+# Author of original patch: Paolo Giarrusso, aka Blaisorblade
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+# (http://www.user-mode-linux.org/~blaisorblade)
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+#
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+# Known misfeatures:
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+#
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+# - If output is too long, blocks (and breaks horribly)
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+# (this misfeature from 3.10 patches, when minimalizing the patch;
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+# workaround: redirect to a shared filesystem if long output is expected)
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+#
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+# - Nothing useful is done with stdin
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+#
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+--- a/arch/um/drivers/mconsole.h
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++++ b/arch/um/drivers/mconsole.h
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+@@ -85,6 +85,7 @@ extern void mconsole_cad(struct mc_reque
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+ extern void mconsole_stop(struct mc_request *req);
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+ extern void mconsole_go(struct mc_request *req);
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+ extern void mconsole_log(struct mc_request *req);
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++extern void mconsole_exec(struct mc_request *req);
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+ extern void mconsole_proc(struct mc_request *req);
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+ extern void mconsole_stack(struct mc_request *req);
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+
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+--- a/arch/um/drivers/mconsole_kern.c
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++++ b/arch/um/drivers/mconsole_kern.c
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+@@ -4,6 +4,7 @@
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+ * Copyright (C) 2001 - 2008 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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+ */
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+
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++#include <linux/kmod.h>
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+ #include <linux/console.h>
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+ #include <linux/ctype.h>
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+ #include <linux/string.h>
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+@@ -27,6 +28,7 @@
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+ #include <linux/mount.h>
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+ #include <linux/file.h>
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+ #include <linux/uaccess.h>
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++#include <linux/completion.h>
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+ #include <asm/switch_to.h>
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+
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+ #include <init.h>
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+@@ -124,6 +126,59 @@ void mconsole_log(struct mc_request *req
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+ mconsole_reply(req, "", 0, 0);
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+ }
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+
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++void mconsole_exec(struct mc_request *req)
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++{
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++ struct subprocess_info *sub_info;
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++ int res, len;
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++ struct file *out;
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++ char buf[MCONSOLE_MAX_DATA];
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++
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++ char *envp[] = {
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++ "HOME=/", "TERM=linux",
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++ "PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin",
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++ NULL
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++ };
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++ char *argv[] = {
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++ "/bin/sh", "-c",
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++ req->request.data + strlen("exec "),
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++ NULL
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++ };
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++
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++ sub_info = call_usermodehelper_setup("/bin/sh", argv, envp, GFP_ATOMIC, NULL, NULL, NULL);
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++ if (sub_info == NULL) {
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++ mconsole_reply(req, "call_usermodehelper_setup failed", 1, 0);
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++ return;
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++ }
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++ res = call_usermodehelper_stdoutpipe(sub_info, &out);
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++ if (res < 0) {
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++ kfree(sub_info);
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++ mconsole_reply(req, "call_usermodehelper_stdoutpipe failed", 1, 0);
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++ return;
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++ }
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++
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++ res = call_usermodehelper_exec(sub_info, UMH_WAIT_PROC);
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++ if (res < 0) {
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++ kfree(sub_info);
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++ mconsole_reply(req, "call_usermodehelper_exec failed", 1, 0);
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++ return;
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++ }
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++
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++ for (;;) {
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++ len = out->f_op->read(out, buf, sizeof(buf), &out->f_pos);
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++ if (len < 0) {
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++ mconsole_reply(req, "reading output failed", 1, 0);
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++ break;
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++ }
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++ if (len == 0)
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++ break;
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++ mconsole_reply_len(req, buf, len, 0, 1);
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++ }
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++ fput(out);
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++
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++ mconsole_reply_len(req, NULL, 0, 0, 0);
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++}
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++
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++
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+ void mconsole_proc(struct mc_request *req)
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+ {
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+ struct vfsmount *mnt = proc_mnt;
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+@@ -190,6 +245,7 @@ void mconsole_proc(struct mc_request *re
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+ stop - pause the UML; it will do nothing until it receives a 'go' \n\
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+ go - continue the UML after a 'stop' \n\
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+ log <string> - make UML enter <string> into the kernel log\n\
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++ exec <string> - pass <string> to /bin/sh -c synchronously\n\
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+ proc <file> - returns the contents of the UML's /proc/<file>\n\
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+ stack <pid> - returns the stack of the specified pid\n\
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+ "
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+--- a/arch/um/drivers/mconsole_user.c
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++++ b/arch/um/drivers/mconsole_user.c
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+@@ -30,6 +30,7 @@ static struct mconsole_command commands[
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+ { "stop", mconsole_stop, MCONSOLE_PROC },
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+ { "go", mconsole_go, MCONSOLE_INTR },
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+ { "log", mconsole_log, MCONSOLE_INTR },
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++ { "exec", mconsole_exec, MCONSOLE_PROC },
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+ { "proc", mconsole_proc, MCONSOLE_PROC },
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+ { "stack", mconsole_stack, MCONSOLE_INTR },
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+ };
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+--- a/arch/um/os-Linux/file.c
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++++ b/arch/um/os-Linux/file.c
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+@@ -560,6 +560,8 @@ int os_create_unix_socket(const char *fi
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+
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+ addr.sun_family = AF_UNIX;
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+
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++ if (len > sizeof(addr.sun_path))
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++ len = sizeof(addr.sun_path);
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+ snprintf(addr.sun_path, len, "%s", file);
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+
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+ err = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
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+--- a/include/linux/kmod.h
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++++ b/include/linux/kmod.h
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+@@ -32,4 +32,6 @@ static inline int request_module_nowait(
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+ #define try_then_request_module(x, mod...) (x)
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+ #endif
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+
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++int call_usermodehelper_stdoutpipe(struct subprocess_info *sub_info, struct file **filp);
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++
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+ #endif /* __LINUX_KMOD_H__ */
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+--- a/include/linux/umh.h
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++++ b/include/linux/umh.h
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+@@ -22,6 +22,7 @@ struct subprocess_info {
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+ const char *path;
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+ char **argv;
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+ char **envp;
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++ struct file *stdout;
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+ int wait;
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+ int retval;
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+ int (*init)(struct subprocess_info *info, struct cred *new);
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+--- a/kernel/umh.c
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++++ b/kernel/umh.c
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+@@ -28,6 +28,7 @@
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+ #include <linux/async.h>
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+ #include <linux/uaccess.h>
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+ #include <linux/initrd.h>
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++#include <linux/pipe_fs_i.h>
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+
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+ #include <trace/events/module.h>
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+
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+@@ -73,6 +74,28 @@ static int call_usermodehelper_exec_asyn
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+ flush_signal_handlers(current, 1);
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+ spin_unlock_irq(¤t->sighand->siglock);
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+
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++ /* Install output when needed */
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++ if (sub_info->stdout) {
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++ struct files_struct *f = current->files;
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++ struct fdtable *fdt;
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++
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++ sys_close(1);
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++ sys_close(2);
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++ get_file(sub_info->stdout);
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++ fd_install(1, sub_info->stdout);
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++ fd_install(2, sub_info->stdout);
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++ spin_lock(&f->file_lock);
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++ fdt = files_fdtable(f);
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++ __set_bit(1, fdt->open_fds);
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++ __clear_bit(1, fdt->close_on_exec);
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++ __set_bit(2, fdt->open_fds);
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++ __clear_bit(2, fdt->close_on_exec);
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++ spin_unlock(&f->file_lock);
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++
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++ /* disallow core files */
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++ current->signal->rlim[RLIMIT_CORE] = (struct rlimit){0, 0};
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++ }
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++
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+ /*
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+ * Initial kernel threads share ther FS with init, in order to
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+ * get the init root directory. But we've now created a new
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+@@ -332,6 +355,20 @@ static void helper_unlock(void)
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+ wake_up(&running_helpers_waitq);
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+ }
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+
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++int call_usermodehelper_stdoutpipe(struct subprocess_info *sub_info,
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++ struct file **filp)
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++{
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++ struct file *f[2];
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++
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++ if (create_pipe_files(f, 0) < 0)
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++ return PTR_ERR(f);
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++
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++ sub_info->stdout = f[1];
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++ *filp = f[0];
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++ return 0;
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++}
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++EXPORT_SYMBOL(call_usermodehelper_stdoutpipe);
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++
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+ /**
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+ * call_usermodehelper_setup - prepare to call a usermode helper
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+ * @path: path to usermode executable
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Christian Lamparter