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Diffstat (limited to 'target/linux/uml/patches-4.4/101-mconsole-exec.patch')
-rw-r--r--target/linux/uml/patches-4.4/101-mconsole-exec.patch211
1 files changed, 211 insertions, 0 deletions
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
generated by cgit v1.1 at 2024-12-29 12:56:15 +0000