From 6e15c8b20b2ff852fcc638948eb88ea5dfa4a916 Mon Sep 17 00:00:00 2001
From: Ray Strode <rstrode@redhat.com>
Date: Fri, 10 Oct 2014 16:11:01 -0400
Subject: [PATCH] main: fix incorrectly sized buffer for /proc/cmdline

We assume /proc/cmdline will be no more than 512 bytes (including NUL).
It can actually be 4096 bytes (excluding NUL).

This commit makes sure we allocate enough space for it and its NUL.
---
 src/main.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/main.c b/src/main.c
index 4101550..d5f4f4d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -30,61 +30,61 @@
 #include <fcntl.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <sysexits.h>
 #include <sys/ioctl.h>
 #include <unistd.h>
 #include <wchar.h>
 #include <paths.h>
 #include <assert.h>
 #include <values.h>
 
 #include <linux/kd.h>
 #include <linux/vt.h>
 
 #include "ply-buffer.h"
 #include "ply-command-parser.h"
 #include "ply-boot-server.h"
 #include "ply-boot-splash.h"
 #include "ply-device-manager.h"
 #include "ply-event-loop.h"
 #include "ply-hashtable.h"
 #include "ply-list.h"
 #include "ply-logger.h"
 #include "ply-renderer.h"
 #include "ply-terminal-session.h"
 #include "ply-trigger.h"
 #include "ply-utils.h"
 #include "ply-progress.h"
 
 #ifndef PLY_MAX_COMMAND_LINE_SIZE
-#define PLY_MAX_COMMAND_LINE_SIZE 512
+#define PLY_MAX_COMMAND_LINE_SIZE 4097
 #endif
 
 #define BOOT_DURATION_FILE     PLYMOUTH_TIME_DIRECTORY "/boot-duration"
 #define SHUTDOWN_DURATION_FILE PLYMOUTH_TIME_DIRECTORY "/shutdown-duration"
 
 typedef enum {
   PLY_MODE_BOOT,
   PLY_MODE_SHUTDOWN,
   PLY_MODE_UPDATES
 } ply_mode_t;
 
 typedef struct 
 {
   const char    *keys;
   ply_trigger_t *trigger;
 } ply_keystroke_watch_t;
 
 typedef struct 
 {
   enum {PLY_ENTRY_TRIGGER_TYPE_PASSWORD,
         PLY_ENTRY_TRIGGER_TYPE_QUESTION}
         type;
   const char    *prompt;
   ply_trigger_t *trigger;
 } ply_entry_trigger_t;
 
 typedef struct
 {
   ply_event_loop_t *loop;
   ply_boot_server_t *boot_server;
@@ -1782,68 +1782,67 @@ detach_from_running_session (state_t *state)
 
   if (!state->is_attached)
     return;
 
   ply_trace ("detaching from terminal session");
   ply_terminal_session_detach (state->session);
   state->is_redirected = false;
   state->is_attached = false;
 }
 
 static bool
 get_kernel_command_line (state_t *state)
 {
   int fd;
   const char *remaining_command_line;
   char *key;
 
   if (state->kernel_command_line_is_set)
     return true;
 
   ply_trace ("opening /proc/cmdline");
   fd = open ("/proc/cmdline", O_RDONLY);
 
   if (fd < 0)
     {
       ply_trace ("couldn't open it: %m");
       return false;
     }
 
   ply_trace ("reading kernel command line");
-  if (read (fd, state->kernel_command_line, sizeof (state->kernel_command_line)) < 0)
+  if (read (fd, state->kernel_command_line, sizeof (state->kernel_command_line) - 1) < 0)
     {
       ply_trace ("couldn't read it: %m");
       close (fd);
       return false;
     }
 
-
   /* we now use plymouth.argument for kernel commandline arguments.
    * It used to be plymouth:argument. This bit just rewrites all : to be .
    */
   remaining_command_line = state->kernel_command_line;
   while ((key = strstr (remaining_command_line, "plymouth:")) != NULL)
     {
       char *colon;
 
       colon = key + strlen ("plymouth");
       *colon = '.';
 
       remaining_command_line = colon + 1;
     }
   ply_trace ("Kernel command line is: '%s'", state->kernel_command_line);
 
   close (fd);
 
   state->kernel_command_line_is_set = true;
   return true;
 }
 
 static void
 check_verbosity (state_t *state)
 {
   const char *stream;
   const char *path;
 
   ply_trace ("checking if tracing should be enabled");
 
   stream = command_line_get_string_after_prefix (state->kernel_command_line,
-- 
1.8.3.1