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Message-ID: <20230414100212.766118-2-Luca.Vizzarro@arm.com>
Date: Fri, 14 Apr 2023 11:02:08 +0100
From: Luca Vizzarro <Luca.Vizzarro@....com>
To: <linux-kernel@...r.kernel.org>
CC: Luca Vizzarro <Luca.Vizzarro@....com>,
Kevin Brodsky <Kevin.Brodsky@....com>,
Szabolcs Nagy <Szabolcs.Nagy@....com>,
Theodore Ts'o <tytso@....edu>,
David Laight <David.Laight@...LAB.com>,
Mark Rutland <Mark.Rutland@....com>,
Alexander Viro <viro@...iv.linux.org.uk>,
"Christian Brauner" <brauner@...nel.org>,
Jeff Layton <jlayton@...nel.org>,
Chuck Lever <chuck.lever@...cle.com>,
<linux-fsdevel@...r.kernel.org>
Subject: [PATCH 1/5] fcntl: Cast commands with int args explicitly
According to the fcntl API specification commands that expect an
integer, hence not a pointer, always take an int and not long. In
order to avoid access to undefined bits, we should explicitly cast
the argument to int.
Cc: Kevin Brodsky <Kevin.Brodsky@....com>
Cc: Szabolcs Nagy <Szabolcs.Nagy@....com>
Cc: "Theodore Ts'o" <tytso@....edu>
Cc: David Laight <David.Laight@...LAB.com>
Cc: Mark Rutland <Mark.Rutland@....com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: Christian Brauner <brauner@...nel.org>
Cc: Jeff Layton <jlayton@...nel.org>
Cc: Chuck Lever <chuck.lever@...cle.com>
Cc: linux-fsdevel@...r.kernel.org
Signed-off-by: Luca Vizzarro <Luca.Vizzarro@....com>
---
fs/fcntl.c | 29 +++++++++++++++--------------
include/linux/fs.h | 2 +-
2 files changed, 16 insertions(+), 15 deletions(-)
diff --git a/fs/fcntl.c b/fs/fcntl.c
index b622be119706..e871009f6c88 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -34,7 +34,7 @@
#define SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT | O_NOATIME)
-static int setfl(int fd, struct file * filp, unsigned long arg)
+static int setfl(int fd, struct file * filp, unsigned int arg)
{
struct inode * inode = file_inode(filp);
int error = 0;
@@ -112,11 +112,11 @@ void __f_setown(struct file *filp, struct pid *pid, enum pid_type type,
}
EXPORT_SYMBOL(__f_setown);
-int f_setown(struct file *filp, unsigned long arg, int force)
+int f_setown(struct file *filp, int who, int force)
{
enum pid_type type;
struct pid *pid = NULL;
- int who = arg, ret = 0;
+ int ret = 0;
type = PIDTYPE_TGID;
if (who < 0) {
@@ -317,28 +317,29 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
struct file *filp)
{
void __user *argp = (void __user *)arg;
+ int argi = (int)arg;
struct flock flock;
long err = -EINVAL;
switch (cmd) {
case F_DUPFD:
- err = f_dupfd(arg, filp, 0);
+ err = f_dupfd(argi, filp, 0);
break;
case F_DUPFD_CLOEXEC:
- err = f_dupfd(arg, filp, O_CLOEXEC);
+ err = f_dupfd(argi, filp, O_CLOEXEC);
break;
case F_GETFD:
err = get_close_on_exec(fd) ? FD_CLOEXEC : 0;
break;
case F_SETFD:
err = 0;
- set_close_on_exec(fd, arg & FD_CLOEXEC);
+ set_close_on_exec(fd, argi & FD_CLOEXEC);
break;
case F_GETFL:
err = filp->f_flags;
break;
case F_SETFL:
- err = setfl(fd, filp, arg);
+ err = setfl(fd, filp, argi);
break;
#if BITS_PER_LONG != 32
/* 32-bit arches must use fcntl64() */
@@ -375,7 +376,7 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
force_successful_syscall_return();
break;
case F_SETOWN:
- err = f_setown(filp, arg, 1);
+ err = f_setown(filp, argi, 1);
break;
case F_GETOWN_EX:
err = f_getown_ex(filp, arg);
@@ -391,28 +392,28 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
break;
case F_SETSIG:
/* arg == 0 restores default behaviour. */
- if (!valid_signal(arg)) {
+ if (!valid_signal(argi)) {
break;
}
err = 0;
- filp->f_owner.signum = arg;
+ filp->f_owner.signum = argi;
break;
case F_GETLEASE:
err = fcntl_getlease(filp);
break;
case F_SETLEASE:
- err = fcntl_setlease(fd, filp, arg);
+ err = fcntl_setlease(fd, filp, argi);
break;
case F_NOTIFY:
- err = fcntl_dirnotify(fd, filp, arg);
+ err = fcntl_dirnotify(fd, filp, argi);
break;
case F_SETPIPE_SZ:
case F_GETPIPE_SZ:
- err = pipe_fcntl(filp, cmd, arg);
+ err = pipe_fcntl(filp, cmd, argi);
break;
case F_ADD_SEALS:
case F_GET_SEALS:
- err = memfd_fcntl(filp, cmd, arg);
+ err = memfd_fcntl(filp, cmd, argi);
break;
case F_GET_RW_HINT:
case F_SET_RW_HINT:
diff --git a/include/linux/fs.h b/include/linux/fs.h
index c85916e9f7db..8da79822dbba 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1050,7 +1050,7 @@ extern void fasync_free(struct fasync_struct *);
extern void kill_fasync(struct fasync_struct **, int, int);
extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
-extern int f_setown(struct file *filp, unsigned long arg, int force);
+extern int f_setown(struct file *filp, int who, int force);
extern void f_delown(struct file *filp);
extern pid_t f_getown(struct file *filp);
extern int send_sigurg(struct fown_struct *fown);
--
2.34.1
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