rk: printk: add pm_emit_log_char

[firefly-linux-kernel-4.4.55.git] / kernel / sys.c

diff --git a/kernel/sys.c b/kernel/sys.c
index 378381e9dd70c13f1c0f6475defac653b6e12220..01f195e9607323ac1595e429917b8617fdb727a6 100644 (file)
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -38,6 +38,8 @@
 #include <linux/fs_struct.h>
 #include <linux/gfp.h>
 #include <linux/syscore_ops.h>
+#include <linux/version.h>
+#include <linux/ctype.h>
 
 #include <linux/compat.h>
 #include <linux/syscalls.h>
@@ -45,6 +47,8 @@
 #include <linux/user_namespace.h>
 
 #include <linux/kmsg_dump.h>
+/* Move somewhere else to avoid recompiling? */
+#include <generated/utsrelease.h>
 
 #include <asm/uaccess.h>
 #include <asm/io.h>
@@ -347,6 +351,7 @@ void kernel_restart(char *cmd)
        restart_dbg("%s->%d->cmd=%s",__FUNCTION__,__LINE__,cmd);
        
        kernel_restart_prepare(cmd);
+       disable_nonboot_cpus();
        if (!cmd)
                printk(KERN_EMERG "Restarting system.\n");
        else
@@ -1155,6 +1160,36 @@ DECLARE_RWSEM(uts_sem);
 #define override_architecture(name)    0
 #endif
 
+/*
+ * Work around broken programs that cannot handle "Linux 3.0".
+ * Instead we map 3.x to 2.6.40+x, so e.g. 3.0 would be 2.6.40
+ */
+static int override_release(char __user *release, size_t len)
+{
+       int ret = 0;
+
+       if (current->personality & UNAME26) {
+               const char *rest = UTS_RELEASE;
+               char buf[65] = { 0 };
+               int ndots = 0;
+               unsigned v;
+               size_t copy;
+
+               while (*rest) {
+                       if (*rest == '.' && ++ndots >= 3)
+                               break;
+                       if (!isdigit(*rest) && *rest != '.')
+                               break;
+                       rest++;
+               }
+               v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 40;
+               copy = clamp_t(size_t, len, 1, sizeof(buf));
+               copy = scnprintf(buf, copy, "2.6.%u%s", v, rest);
+               ret = copy_to_user(release, buf, copy + 1);
+       }
+       return ret;
+}
+
 SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name)
 {
        int errno = 0;
@@ -1164,6 +1199,8 @@ SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name)
                errno = -EFAULT;
        up_read(&uts_sem);
 
+       if (!errno && override_release(name->release, sizeof(name->release)))
+               errno = -EFAULT;
        if (!errno && override_architecture(name))
                errno = -EFAULT;
        return errno;
@@ -1185,6 +1222,8 @@ SYSCALL_DEFINE1(uname, struct old_utsname __user *, name)
                error = -EFAULT;
        up_read(&uts_sem);
 
+       if (!error && override_release(name->release, sizeof(name->release)))
+               error = -EFAULT;
        if (!error && override_architecture(name))
                error = -EFAULT;
        return error;
@@ -1219,6 +1258,8 @@ SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name)
 
        if (!error && override_architecture(name))
                error = -EFAULT;
+       if (!error && override_release(name->release, sizeof(name->release)))
+               error = -EFAULT;
        return error ? -EFAULT : 0;
 }
 #endif