Commit 50097f74 authored by Oleg Nesterov's avatar Oleg Nesterov Committed by Linus Torvalds

exec: binfmt_misc: kill the onstack iname[BINPRM_BUF_SIZE] array

After the previous change "fmt" can't go away, we can kill
iname/iname_addr and use fmt->interpreter.

Link: http://lkml.kernel.org/r/20170922143653.GA17232@redhat.comSigned-off-by: default avatarOleg Nesterov <oleg@redhat.com>
Acked-by: default avatarKees Cook <keescook@chromium.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Ben Woodard <woodard@redhat.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Jim Foraker <foraker1@llnl.gov>
Cc: <tdhooge@llnl.gov>
Cc: Travis Gummels <tgummels@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 43a4f261
......@@ -54,7 +54,7 @@ typedef struct {
int size; /* size of magic/mask */
char *magic; /* magic or filename extension */
char *mask; /* mask, NULL for exact match */
char *interpreter; /* filename of interpreter */
const char *interpreter; /* filename of interpreter */
char *name;
struct dentry *dentry;
struct file *interp_file;
......@@ -131,8 +131,6 @@ static int load_misc_binary(struct linux_binprm *bprm)
{
Node *fmt;
struct file *interp_file = NULL;
char iname[BINPRM_BUF_SIZE];
const char *iname_addr = iname;
int retval;
int fd_binary = -1;
......@@ -143,10 +141,8 @@ static int load_misc_binary(struct linux_binprm *bprm)
/* to keep locking time low, we copy the interpreter string */
read_lock(&entries_lock);
fmt = check_file(bprm);
if (fmt) {
if (fmt)
dget(fmt->dentry);
strlcpy(iname, fmt->interpreter, BINPRM_BUF_SIZE);
}
read_unlock(&entries_lock);
if (!fmt)
return retval;
......@@ -198,13 +194,13 @@ static int load_misc_binary(struct linux_binprm *bprm)
bprm->argc++;
/* add the interp as argv[0] */
retval = copy_strings_kernel(1, &iname_addr, bprm);
retval = copy_strings_kernel(1, &fmt->interpreter, bprm);
if (retval < 0)
goto error;
bprm->argc++;
/* Update interp in case binfmt_script needs it. */
retval = bprm_change_interp(iname, bprm);
retval = bprm_change_interp(fmt->interpreter, bprm);
if (retval < 0)
goto error;
......@@ -213,7 +209,7 @@ static int load_misc_binary(struct linux_binprm *bprm)
if (!IS_ERR(interp_file))
deny_write_access(interp_file);
} else {
interp_file = open_exec(iname);
interp_file = open_exec(fmt->interpreter);
}
retval = PTR_ERR(interp_file);
if (IS_ERR(interp_file))
......
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