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File locking fixes for v6.6 

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Merge tag 'filelock-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux

Pull file locking updates from Jeff Layton:

 - new functionality for F_OFD_GETLK: requesting a type of F_UNLCK will
   find info about whatever lock happens to be first in the given range,
   regardless of type.

 - an OFD lock selftest

 - bugfix involving a UAF in a tracepoint

 - comment typo fix

* tag 'filelock-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux:
  locks: fix KASAN: use-after-free in trace_event_raw_event_filelock_lock
  fs/locks: Fix typo
  selftests: add OFD lock tests
  fs/locks: F_UNLCK extension for F_OFD_GETLK
This commit is contained in:
Linus Torvalds 2023-08-28 11:47:24 -07:00
parent b4a04f92a4 74f6f59126
commit f20ae9cf5b
3 changed files with 159 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
fs/locks.c
View File

@ -868,6 +868,21 @@ static bool posix_locks_conflict(struct file_lock *caller_fl,
return locks_conflict(caller_fl, sys_fl);
}
/* Determine if lock sys_fl blocks lock caller_fl. Used on xx_GETLK
* path so checks for additional GETLK-specific things like F_UNLCK.
*/
static bool posix_test_locks_conflict(struct file_lock *caller_fl,
struct file_lock *sys_fl)
{
/* F_UNLCK checks any locks on the same fd. */
if (caller_fl->fl_type == F_UNLCK) {
if (!posix_same_owner(caller_fl, sys_fl))
return false;
return locks_overlap(caller_fl, sys_fl);
}
return posix_locks_conflict(caller_fl, sys_fl);
}
/* Determine if lock sys_fl blocks lock caller_fl. FLOCK specific
* checking before calling the locks_conflict().
*/
@ -901,7 +916,7 @@ posix_test_lock(struct file *filp, struct file_lock *fl)
retry:
spin_lock(&ctx->flc_lock);
list_for_each_entry(cfl, &ctx->flc_posix, fl_list) {
if (!posix_locks_conflict(fl, cfl))
if (!posix_test_locks_conflict(fl, cfl))
continue;
if (cfl->fl_lmops && cfl->fl_lmops->lm_lock_expirable
&& (*cfl->fl_lmops->lm_lock_expirable)(cfl)) {
@ -1301,6 +1316,7 @@ retry:
out:
spin_unlock(&ctx->flc_lock);
percpu_up_read(&file_rwsem);
trace_posix_lock_inode(inode, request, error);
/*
* Free any unused locks.
*/
@ -1309,7 +1325,6 @@ retry:
if (new_fl2)
locks_free_lock(new_fl2);
locks_dispose_list(&dispose);
trace_posix_lock_inode(inode, request, error);
return error;
}
@ -2136,7 +2151,7 @@ EXPORT_SYMBOL_GPL(vfs_test_lock);
* @fl: The file_lock who's fl_pid should be translated
* @ns: The namespace into which the pid should be translated
*
* Used to tranlate a fl_pid into a namespace virtual pid number
* Used to translate a fl_pid into a namespace virtual pid number
*/
static pid_t locks_translate_pid(struct file_lock *fl, struct pid_namespace *ns)
{
@ -2207,7 +2222,8 @@ int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock *flock)
if (fl == NULL)
return -ENOMEM;
error = -EINVAL;
if (flock->l_type != F_RDLCK && flock->l_type != F_WRLCK)
if (cmd != F_OFD_GETLK && flock->l_type != F_RDLCK
&& flock->l_type != F_WRLCK)
goto out;
error = flock_to_posix_lock(filp, fl, flock);
@ -2414,7 +2430,8 @@ int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 *flock)
return -ENOMEM;
error = -EINVAL;
if (flock->l_type != F_RDLCK && flock->l_type != F_WRLCK)
if (cmd != F_OFD_GETLK && flock->l_type != F_RDLCK
&& flock->l_type != F_WRLCK)
goto out;
error = flock64_to_posix_lock(filp, fl, flock);

5
tools/testing/selftests/filelock/Makefile Normal file
View File

@ -0,0 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
TEST_GEN_PROGS := ofdlocks
include ../lib.mk

132
tools/testing/selftests/filelock/ofdlocks.c Normal file
View File

@ -0,0 +1,132 @@
// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <fcntl.h>
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include "../kselftest.h"
static int lock_set(int fd, struct flock *fl)
{
int ret;
fl->l_pid = 0; // needed for OFD locks
fl->l_whence = SEEK_SET;
ret = fcntl(fd, F_OFD_SETLK, fl);
if (ret)
perror("fcntl()");
return ret;
}
static int lock_get(int fd, struct flock *fl)
{
int ret;
fl->l_pid = 0; // needed for OFD locks
fl->l_whence = SEEK_SET;
ret = fcntl(fd, F_OFD_GETLK, fl);
if (ret)
perror("fcntl()");
return ret;
}
int main(void)
{
int rc;
struct flock fl, fl2;
int fd = open("/tmp/aa", O_RDWR | O_CREAT | O_EXCL, 0600);
int fd2 = open("/tmp/aa", O_RDONLY);
unlink("/tmp/aa");
assert(fd != -1);
assert(fd2 != -1);
ksft_print_msg("[INFO] opened fds %i %i\n", fd, fd2);
/* Set some read lock */
fl.l_type = F_RDLCK;
fl.l_start = 5;
fl.l_len = 3;
rc = lock_set(fd, &fl);
if (rc == 0) {
ksft_print_msg
("[SUCCESS] set OFD read lock on first fd\n");
} else {
ksft_print_msg("[FAIL] to set OFD read lock on first fd\n");
return -1;
}
/* Make sure read locks do not conflict on different fds. */
fl.l_type = F_RDLCK;
fl.l_start = 5;
fl.l_len = 1;
rc = lock_get(fd2, &fl);
if (rc != 0)
return -1;
if (fl.l_type != F_UNLCK) {
ksft_print_msg("[FAIL] read locks conflicted\n");
return -1;
}
/* Make sure read/write locks do conflict on different fds. */
fl.l_type = F_WRLCK;
fl.l_start = 5;
fl.l_len = 1;
rc = lock_get(fd2, &fl);
if (rc != 0)
return -1;
if (fl.l_type != F_UNLCK) {
ksft_print_msg
("[SUCCESS] read and write locks conflicted\n");
} else {
ksft_print_msg
("[SUCCESS] read and write locks not conflicted\n");
return -1;
}
/* Get info about the lock on first fd. */
fl.l_type = F_UNLCK;
fl.l_start = 5;
fl.l_len = 1;
rc = lock_get(fd, &fl);
if (rc != 0) {
ksft_print_msg
("[FAIL] F_OFD_GETLK with F_UNLCK not supported\n");
return -1;
}
if (fl.l_type != F_UNLCK) {
ksft_print_msg
("[SUCCESS] F_UNLCK test returns: locked, type %i pid %i len %zi\n",
fl.l_type, fl.l_pid, fl.l_len);
} else {
ksft_print_msg
("[FAIL] F_OFD_GETLK with F_UNLCK did not return lock info\n");
return -1;
}
/* Try the same but by locking everything by len==0. */
fl2.l_type = F_UNLCK;
fl2.l_start = 0;
fl2.l_len = 0;
rc = lock_get(fd, &fl2);
if (rc != 0) {
ksft_print_msg
("[FAIL] F_OFD_GETLK with F_UNLCK not supported\n");
return -1;
}
if (memcmp(&fl, &fl2, sizeof(fl))) {
ksft_print_msg
("[FAIL] F_UNLCK test returns: locked, type %i pid %i len %zi\n",
fl.l_type, fl.l_pid, fl.l_len);
return -1;
}
ksft_print_msg("[SUCCESS] F_UNLCK with len==0 returned the same\n");
/* Get info about the lock on second fd - no locks on it. */
fl.l_type = F_UNLCK;
fl.l_start = 0;
fl.l_len = 0;
lock_get(fd2, &fl);
if (fl.l_type != F_UNLCK) {
ksft_print_msg
("[FAIL] F_OFD_GETLK with F_UNLCK return lock info from another fd\n");
return -1;
}
return 0;
}