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authorOleg Nesterov <oleg@redhat.com>2017-10-03 16:15:58 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-10-03 17:54:25 -0700
commit50097f74934e3ec8fb1e6f3087568b958972817d (patch)
tree686cdcc7ec9506b3a9175903a12e9354f376bd5e /fs/binfmt_misc.c
parent43a4f2619038002f48c78698c42c05692d4b4eb2 (diff)
downloadlinux-50097f74934e3ec8fb1e6f3087568b958972817d.tar.bz2
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.com Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Kees 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: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/binfmt_misc.c')
-rw-r--r--fs/binfmt_misc.c14
1 files changed, 5 insertions, 9 deletions
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index f5f8c2541790..2a46762def31 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -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))