mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 16:55:13 +07:00
b31ff3cdf5
If using a kernel with CONFIG_XFS_RT=y and we set the RHINHERIT flag on
a directory in a filesystem that does not have a realtime device and
create a new file in that directory, it gets marked as a real time file.
When data is written and a fsync is issued, the filesystem attempts to
flush a non-existent rt device during the fsync process.
This results in a crash dereferencing a null buftarg pointer in
xfs_blkdev_issue_flush():
BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
IP: xfs_blkdev_issue_flush+0xd/0x20
.....
Call Trace:
xfs_file_fsync+0x188/0x1c0
vfs_fsync_range+0x3b/0xa0
do_fsync+0x3d/0x70
SyS_fsync+0x10/0x20
do_syscall_64+0x4d/0xb0
entry_SYSCALL64_slow_path+0x25/0x25
Setting RT inode flags does not require special privileges so any
unprivileged user can cause this oops to occur. To reproduce, confirm
kernel is compiled with CONFIG_XFS_RT=y and run:
# mkfs.xfs -f /dev/pmem0
# mount /dev/pmem0 /mnt/test
# mkdir /mnt/test/foo
# xfs_io -c 'chattr +t' /mnt/test/foo
# xfs_io -f -c 'pwrite 0 5m' -c fsync /mnt/test/foo/bar
Or just run xfstests with MKFS_OPTIONS="-d rtinherit=1" and wait.
Kernels built with CONFIG_XFS_RT=n are not exposed to this bug.
Fixes: f538d4da8d ("[XFS] write barrier support")
Cc: <stable@vger.kernel.org>
Signed-off-by: Richard Wareing <rwareing@fb.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
286 lines
7.3 KiB
C
286 lines
7.3 KiB
C
/*
|
|
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it would be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#ifndef __XFS_LINUX__
|
|
#define __XFS_LINUX__
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/uuid.h>
|
|
|
|
/*
|
|
* Kernel specific type declarations for XFS
|
|
*/
|
|
|
|
typedef __s64 xfs_off_t; /* <file offset> type */
|
|
typedef unsigned long long xfs_ino_t; /* <inode> type */
|
|
typedef __s64 xfs_daddr_t; /* <disk address> type */
|
|
typedef __u32 xfs_dev_t;
|
|
typedef __u32 xfs_nlink_t;
|
|
|
|
#include "xfs_types.h"
|
|
|
|
#include "kmem.h"
|
|
#include "mrlock.h"
|
|
|
|
#include <linux/semaphore.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/crc32c.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/file.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/sched/signal.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/major.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/vfs.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/init.h>
|
|
#include <linux/list.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/sort.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/log2.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/random.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/writeback.h>
|
|
#include <linux/capability.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/freezer.h>
|
|
#include <linux/list_sort.h>
|
|
#include <linux/ratelimit.h>
|
|
#include <linux/rhashtable.h>
|
|
|
|
#include <asm/page.h>
|
|
#include <asm/div64.h>
|
|
#include <asm/param.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/byteorder.h>
|
|
#include <asm/unaligned.h>
|
|
|
|
#include "xfs_fs.h"
|
|
#include "xfs_stats.h"
|
|
#include "xfs_sysctl.h"
|
|
#include "xfs_iops.h"
|
|
#include "xfs_aops.h"
|
|
#include "xfs_super.h"
|
|
#include "xfs_cksum.h"
|
|
#include "xfs_buf.h"
|
|
#include "xfs_message.h"
|
|
|
|
#ifdef __BIG_ENDIAN
|
|
#define XFS_NATIVE_HOST 1
|
|
#else
|
|
#undef XFS_NATIVE_HOST
|
|
#endif
|
|
|
|
#define irix_sgid_inherit xfs_params.sgid_inherit.val
|
|
#define irix_symlink_mode xfs_params.symlink_mode.val
|
|
#define xfs_panic_mask xfs_params.panic_mask.val
|
|
#define xfs_error_level xfs_params.error_level.val
|
|
#define xfs_syncd_centisecs xfs_params.syncd_timer.val
|
|
#define xfs_stats_clear xfs_params.stats_clear.val
|
|
#define xfs_inherit_sync xfs_params.inherit_sync.val
|
|
#define xfs_inherit_nodump xfs_params.inherit_nodump.val
|
|
#define xfs_inherit_noatime xfs_params.inherit_noatim.val
|
|
#define xfs_inherit_nosymlinks xfs_params.inherit_nosym.val
|
|
#define xfs_rotorstep xfs_params.rotorstep.val
|
|
#define xfs_inherit_nodefrag xfs_params.inherit_nodfrg.val
|
|
#define xfs_fstrm_centisecs xfs_params.fstrm_timer.val
|
|
#define xfs_eofb_secs xfs_params.eofb_timer.val
|
|
#define xfs_cowb_secs xfs_params.cowb_timer.val
|
|
|
|
#define current_cpu() (raw_smp_processor_id())
|
|
#define current_pid() (current->pid)
|
|
#define current_test_flags(f) (current->flags & (f))
|
|
#define current_set_flags_nested(sp, f) \
|
|
(*(sp) = current->flags, current->flags |= (f))
|
|
#define current_clear_flags_nested(sp, f) \
|
|
(*(sp) = current->flags, current->flags &= ~(f))
|
|
#define current_restore_flags_nested(sp, f) \
|
|
(current->flags = ((current->flags & ~(f)) | (*(sp) & (f))))
|
|
|
|
#define spinlock_destroy(lock)
|
|
|
|
#define NBBY 8 /* number of bits per byte */
|
|
|
|
/*
|
|
* Size of block device i/o is parameterized here.
|
|
* Currently the system supports page-sized i/o.
|
|
*/
|
|
#define BLKDEV_IOSHIFT PAGE_SHIFT
|
|
#define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT)
|
|
/* number of BB's per block device block */
|
|
#define BLKDEV_BB BTOBB(BLKDEV_IOSIZE)
|
|
|
|
#define ENOATTR ENODATA /* Attribute not found */
|
|
#define EWRONGFS EINVAL /* Mount with wrong filesystem type */
|
|
#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
|
|
#define EFSBADCRC EBADMSG /* Bad CRC detected */
|
|
|
|
#define SYNCHRONIZE() barrier()
|
|
#define __return_address __builtin_return_address(0)
|
|
|
|
#define XFS_PROJID_DEFAULT 0
|
|
|
|
#define MIN(a,b) (min(a,b))
|
|
#define MAX(a,b) (max(a,b))
|
|
#define howmany(x, y) (((x)+((y)-1))/(y))
|
|
|
|
static inline void delay(long ticks)
|
|
{
|
|
schedule_timeout_uninterruptible(ticks);
|
|
}
|
|
|
|
/*
|
|
* XFS wrapper structure for sysfs support. It depends on external data
|
|
* structures and is embedded in various internal data structures to implement
|
|
* the XFS sysfs object heirarchy. Define it here for broad access throughout
|
|
* the codebase.
|
|
*/
|
|
struct xfs_kobj {
|
|
struct kobject kobject;
|
|
struct completion complete;
|
|
};
|
|
|
|
struct xstats {
|
|
struct xfsstats __percpu *xs_stats;
|
|
struct xfs_kobj xs_kobj;
|
|
};
|
|
|
|
extern struct xstats xfsstats;
|
|
|
|
/* Kernel uid/gid conversion. These are used to convert to/from the on disk
|
|
* uid_t/gid_t types to the kuid_t/kgid_t types that the kernel uses internally.
|
|
* The conversion here is type only, the value will remain the same since we
|
|
* are converting to the init_user_ns. The uid is later mapped to a particular
|
|
* user namespace value when crossing the kernel/user boundary.
|
|
*/
|
|
static inline uint32_t xfs_kuid_to_uid(kuid_t uid)
|
|
{
|
|
return from_kuid(&init_user_ns, uid);
|
|
}
|
|
|
|
static inline kuid_t xfs_uid_to_kuid(uint32_t uid)
|
|
{
|
|
return make_kuid(&init_user_ns, uid);
|
|
}
|
|
|
|
static inline uint32_t xfs_kgid_to_gid(kgid_t gid)
|
|
{
|
|
return from_kgid(&init_user_ns, gid);
|
|
}
|
|
|
|
static inline kgid_t xfs_gid_to_kgid(uint32_t gid)
|
|
{
|
|
return make_kgid(&init_user_ns, gid);
|
|
}
|
|
|
|
/*
|
|
* Various platform dependent calls that don't fit anywhere else
|
|
*/
|
|
#define xfs_sort(a,n,s,fn) sort(a,n,s,fn,NULL)
|
|
#define xfs_stack_trace() dump_stack()
|
|
|
|
/* Side effect free 64 bit mod operation */
|
|
static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
|
|
{
|
|
switch (n) {
|
|
case 4:
|
|
return *(__u32 *)a % b;
|
|
case 8:
|
|
{
|
|
__u64 c = *(__u64 *)a;
|
|
return do_div(c, b);
|
|
}
|
|
}
|
|
|
|
/* NOTREACHED */
|
|
return 0;
|
|
}
|
|
|
|
#define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a))
|
|
|
|
static inline uint64_t roundup_64(uint64_t x, uint32_t y)
|
|
{
|
|
x += y - 1;
|
|
do_div(x, y);
|
|
return x * y;
|
|
}
|
|
|
|
static inline uint64_t howmany_64(uint64_t x, uint32_t y)
|
|
{
|
|
x += y - 1;
|
|
do_div(x, y);
|
|
return x;
|
|
}
|
|
|
|
#define ASSERT_ALWAYS(expr) \
|
|
(likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
|
|
|
|
#ifdef DEBUG
|
|
#define ASSERT(expr) \
|
|
(likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
|
|
|
|
#ifndef STATIC
|
|
# define STATIC noinline
|
|
#endif
|
|
|
|
#else /* !DEBUG */
|
|
|
|
#ifdef XFS_WARN
|
|
|
|
#define ASSERT(expr) \
|
|
(likely(expr) ? (void)0 : asswarn(#expr, __FILE__, __LINE__))
|
|
|
|
#ifndef STATIC
|
|
# define STATIC static noinline
|
|
#endif
|
|
|
|
#else /* !DEBUG && !XFS_WARN */
|
|
|
|
#define ASSERT(expr) ((void)0)
|
|
|
|
#ifndef STATIC
|
|
# define STATIC static noinline
|
|
#endif
|
|
|
|
#endif /* XFS_WARN */
|
|
#endif /* DEBUG */
|
|
|
|
#ifdef CONFIG_XFS_RT
|
|
|
|
/*
|
|
* make sure we ignore the inode flag if the filesystem doesn't have a
|
|
* configured realtime device.
|
|
*/
|
|
#define XFS_IS_REALTIME_INODE(ip) \
|
|
(((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME) && \
|
|
(ip)->i_mount->m_rtdev_targp)
|
|
#else
|
|
#define XFS_IS_REALTIME_INODE(ip) (0)
|
|
#endif
|
|
|
|
#endif /* __XFS_LINUX__ */
|