linux-stable.git/fs/debugfs, branch linux-5.8.y

debugfs: Fix module state check condition

2020-09-17T11:55:44+00:00

commit e3b9fc7eec55e6fdc8beeed18f2ed207086341e2 upstream.

The '#ifdef MODULE' check in the original commit does not work as intended.
The code under the check is not built at all if CONFIG_DEBUG_FS=y. Fix this
by using a correct check.

Fixes: 275678e7a9be ("debugfs: Check module state before warning in {full/open}_proxy_open()")
Signed-off-by: Vladis Dronov 
Cc: stable 
Link: https://lore.kernel.org/r/20200811150129.53343-1-vdronov@redhat.com
Signed-off-by: Greg Kroah-Hartman

Merge 5.7-rc3 into driver-core-next

2020-04-27T07:34:55+00:00

We need the driver core fixes in here as well.

Signed-off-by: Greg Kroah-Hartman

debugfs: Use the correct style for SPDX License Identifier

2020-04-23T15:01:37+00:00

This patch corrects the SPDX License Identifier style in
header file related to debugfs File System support.
For C header files Documentation/process/license-rules.rst
mandates C-like comments (opposed to C source files where
C++ style should be used).

Changes made by using a script provided by Joe Perches here:
https://lkml.org/lkml/2019/2/7/46.

Suggested-by: Joe Perches 
Signed-off-by: Nishad Kamdar 
Link: https://lore.kernel.org/r/20200419144852.GA9206@nishad
Signed-off-by: Greg Kroah-Hartman

debugfs: remove return value of debugfs_create_u32()

2020-04-17T15:08:50+00:00

No one checks the return value of debugfs_create_u32(), as it's not
needed, so make the return value void, so that no one tries to do so in
the future.

Signed-off-by: Greg Kroah-Hartman 
Link: https://lore.kernel.org/r/20200416145448.GA1380878@kroah.com
Signed-off-by: Greg Kroah-Hartman

Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

2020-04-01T21:47:40+00:00

Pull crypto updates from Herbert Xu:
 "API:
   - Fix out-of-sync IVs in self-test for IPsec AEAD algorithms

  Algorithms:
   - Use formally verified implementation of x86/curve25519

  Drivers:
   - Enhance hwrng support in caam

   - Use crypto_engine for skcipher/aead/rsa/hash in caam

   - Add Xilinx AES driver

   - Add uacce driver

   - Register zip engine to uacce in hisilicon

   - Add support for OCTEON TX CPT engine in marvell"

* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (162 commits)
  crypto: af_alg - bool type cosmetics
  crypto: arm[64]/poly1305 - add artifact to .gitignore files
  crypto: caam - limit single JD RNG output to maximum of 16 bytes
  crypto: caam - enable prediction resistance in HRWNG
  bus: fsl-mc: add api to retrieve mc version
  crypto: caam - invalidate entropy register during RNG initialization
  crypto: caam - check if RNG job failed
  crypto: caam - simplify RNG implementation
  crypto: caam - drop global context pointer and init_done
  crypto: caam - use struct hwrng's .init for initialization
  crypto: caam - allocate RNG instantiation descriptor with GFP_DMA
  crypto: ccree - remove duplicated include from cc_aead.c
  crypto: chelsio - remove set but not used variable 'adap'
  crypto: marvell - enable OcteonTX cpt options for build
  crypto: marvell - add the Virtual Function driver for CPT
  crypto: marvell - add support for OCTEON TX CPT engine
  crypto: marvell - create common Kconfig and Makefile for Marvell
  crypto: arm/neon - memzero_explicit aes-cbc key
  crypto: bcm - Use scnprintf() for avoiding potential buffer overflow
  crypto: atmel-i2c - Fix wakeup fail
  ...

debugfs: remove return value of debugfs_create_file_size()

2020-03-18T12:35:29+00:00

No one checks the return value of debugfs_create_file_size, as it's not
needed, so make the return value void, so that no one tries to do so in
the future.

Signed-off-by: Greg Kroah-Hartman 
Link: https://lore.kernel.org/r/20200309163640.237984-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman

debugfs: Check module state before warning in {full/open}_proxy_open()

2020-03-18T11:37:49+00:00

When the module is being removed, the module state is set to
MODULE_STATE_GOING. At this point, try_module_get() fails.
And when {full/open}_proxy_open() is being called,
it calls try_module_get() to try to hold module reference count.
If it fails, it warns about the possibility of debugfs file leak.

If {full/open}_proxy_open() is called while the module is being removed,
it fails to hold the module.
So, It warns about debugfs file leak. But it is not the debugfs file
leak case. So, this patch just adds module state checking routine
in the {full/open}_proxy_open().

Test commands:
    #SHELL1
    while :
    do
        modprobe netdevsim
        echo 1 > /sys/bus/netdevsim/new_device
        modprobe -rv netdevsim
    done

    #SHELL2
    while :
    do
        cat /sys/kernel/debug/netdevsim/netdevsim1/ports/0/ipsec
    done

Splat looks like:
[  298.766738][T14664] debugfs file owner did not clean up at exit: ipsec
[  298.766766][T14664] WARNING: CPU: 2 PID: 14664 at fs/debugfs/file.c:312 full_proxy_open+0x10f/0x650
[  298.768595][T14664] Modules linked in: netdevsim(-) openvswitch nsh nf_conncount nf_nat nf_conntrack nf_defrag_ipv6 n][  298.771343][T14664] CPU: 2 PID: 14664 Comm: cat Tainted: G        W         5.5.0+ #1
[  298.772373][T14664] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[  298.773545][T14664] RIP: 0010:full_proxy_open+0x10f/0x650
[  298.774247][T14664] Code: 48 c1 ea 03 80 3c 02 00 0f 85 c1 04 00 00 49 8b 3c 24 e8 e4 b5 78 ff 84 c0 75 2d 4c 89 ee 48
[  298.776782][T14664] RSP: 0018:ffff88805b7df9b8 EFLAGS: 00010282[  298.777583][T14664] RAX: dffffc0000000008 RBX: ffff8880511725c0 RCX: 0000000000000000
[  298.778610][T14664] RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff8880540c5c14
[  298.779637][T14664] RBP: 0000000000000000 R08: fffffbfff15235ad R09: 0000000000000000
[  298.780664][T14664] R10: 0000000000000001 R11: 0000000000000000 R12: ffffffffc06b5000
[  298.781702][T14664] R13: ffff88804c234a88 R14: ffff88804c22dd00 R15: ffffffff8a1b5660
[  298.782722][T14664] FS:  00007fafa13a8540(0000) GS:ffff88806c800000(0000) knlGS:0000000000000000
[  298.783845][T14664] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  298.784672][T14664] CR2: 00007fafa0e9cd10 CR3: 000000004b286005 CR4: 00000000000606e0
[  298.785739][T14664] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  298.786769][T14664] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  298.787785][T14664] Call Trace:
[  298.788237][T14664]  do_dentry_open+0x63c/0xf50
[  298.788872][T14664]  ? open_proxy_open+0x270/0x270
[  298.789524][T14664]  ? __x64_sys_fchdir+0x180/0x180
[  298.790169][T14664]  ? inode_permission+0x65/0x390
[  298.790832][T14664]  path_openat+0xc45/0x2680
[  298.791425][T14664]  ? save_stack+0x69/0x80
[  298.791988][T14664]  ? save_stack+0x19/0x80
[  298.792544][T14664]  ? path_mountpoint+0x2e0/0x2e0
[  298.793233][T14664]  ? check_chain_key+0x236/0x5d0
[  298.793910][T14664]  ? sched_clock_cpu+0x18/0x170
[  298.794527][T14664]  ? find_held_lock+0x39/0x1d0
[  298.795153][T14664]  do_filp_open+0x16a/0x260
[ ... ]

Fixes: 9fd4dcece43a ("debugfs: prevent access to possibly dead file_operations at file open")
Reported-by: kbuild test robot 
Signed-off-by: Taehee Yoo 
Link: https://lore.kernel.org/r/20200218043150.29447-1-ap420073@gmail.com
Signed-off-by: Greg Kroah-Hartman

debugfs: regset32: Add Runtime PM support

2020-02-22T01:25:42+00:00

Hardware registers of devices under control of power management cannot
be accessed at all times.  If such a device is suspended, register
accesses may lead to undefined behavior, like reading bogus values, or
causing exceptions or system lock-ups.

Extend struct debugfs_regset32 with an optional field to let device
drivers specify the device the registers in the set belong to.  This
allows debugfs_show_regset32() to make sure the device is resumed while
its registers are being read.

Signed-off-by: Geert Uytterhoeven 
Reviewed-by: Niklas Söderlund 
Reviewed-by: Greg Kroah-Hartman 
Acked-by: Rafael J. Wysocki 
Signed-off-by: Herbert Xu

debugfs: remove return value of debugfs_create_regset32()

2020-02-10T21:00:06+00:00

No one checks the return value of debugfs_create_regset32(), as it's not
needed, so make the return value void, so that no one tries to do so in
the future.

Link: https://lore.kernel.org/r/20191122104453.GA2017837@kroah.com
Signed-off-by: Greg Kroah-Hartman

Merge branch 'work.recursive_removal' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2020-02-05T05:09:46+00:00

Pull vfs recursive removal updates from Al Viro:
 "We have quite a few places where synthetic filesystems do an
  equivalent of 'rm -rf', with varying amounts of code duplication,
  wrong locking, etc. That really ought to be a library helper.

  Only debugfs (and very similar tracefs) are converted here - I have
  more conversions, but they'd never been in -next, so they'll have to
  wait"

* 'work.recursive_removal' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  simple_recursive_removal(): kernel-side rm -rf for ramfs-style filesystems