[PATCH v2 3/3] coredump: escape / in hostname and comm

[Jiri Slaby <jslaby@suse.cz>]

Change every occurence of / in comm and hostname to !. If the process
changes its name to contain /, the core is not dumped (if the
directory tree doesn't exist like that). The same with hostname being
something like myhost/3. Fix this behaviour by using the escape loop
used in %E. (We extract it to a separate function.)

Now both with comm == myprocess/1 and hostname == myhost/1, the core
is dumped like (kernel.core_pattern='core.%p.%e.%h):
core.2349.myprocess!1.myhost!1

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andi Kleen <andi@firstfloor.org>
---
 fs/exec.c |   22 +++++++++++++++-------
 1 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/fs/exec.c b/fs/exec.c
index 8900f61..dafded4 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1547,10 +1547,17 @@ expand_fail:
 	return ret;
 }
 
+static void cn_escape(char *str)
+{
+	for (; *str; str++)
+		if (*str == '/')
+			*str = '!';
+}
+
 static int cn_print_exe_file(struct core_name *cn)
 {
 	struct file *exe_file;
-	char *pathbuf, *path, *p;
+	char *pathbuf, *path;
 	int ret;
 
 	exe_file = get_mm_exe_file(current->mm);
@@ -1572,9 +1579,7 @@ static int cn_print_exe_file(struct core_name *cn)
 		goto free_buf;
 	}
 
-	for (p = path; *p; p++)
-		if (*p == '/')
-			*p = '!';
+	cn_escape(path);
 
 	ret = cn_printf(cn, "%s", path);
 
@@ -1652,17 +1657,20 @@ static int format_corename(struct core_name *cn, long signr)
 				break;
 			}
 			/* hostname */
-			case 'h':
+			case 'h': {
+				char *namestart = cn->corename + cn->used;
 				down_read(&uts_sem);
 				err = cn_printf(cn, "%s",
 					      utsname()->nodename);
 				up_read(&uts_sem);
+				cn_escape(namestart);
 				break;
+			}
 			/* executable */
 			case 'e': {
 				char comm[TASK_COMM_LEN];
-				err = cn_printf(cn, "%s",
-						get_task_comm(comm, current));
+				cn_escape(get_task_comm(comm, current));
+				err = cn_printf(cn, "%s", comm);
 				break;
 			}
 			case 'E':
-- 
1.7.4.2

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