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coredump: escape / in hostname and comm

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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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jiri Slaby 2011-07-26 16:08:33 -07:00 committed by Linus Torvalds
parent 3141c8b165
commit 2c563731fe
1 changed files with 23 additions and 8 deletions
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31
fs/exec.c
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@ -1649,15 +1649,26 @@ 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);
if (!exe_file)
return cn_printf(cn, "%s (path unknown)", current->comm);
if (!exe_file) {
char *commstart = cn->corename + cn->used;
ret = cn_printf(cn, "%s (path unknown)", current->comm);
cn_escape(commstart);
return ret;
}
pathbuf = kmalloc(PATH_MAX, GFP_TEMPORARY);
if (!pathbuf) {
@ -1671,9 +1682,7 @@ 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);
@ -1745,16 +1754,22 @@ 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':
case 'e': {
char *commstart = cn->corename + cn->used;
err = cn_printf(cn, "%s", current->comm);
cn_escape(commstart);
break;
}
case 'E':
err = cn_print_exe_file(cn);
break;