linux-stable.git/kernel/module, branch v6.1.2

module: Fix NULL vs IS_ERR checking for module_get_next_page

2022-12-31T12:32:10+00:00

[ Upstream commit 45af1d7aae7d5520d2858f8517a1342646f015db ]

The module_get_next_page() function return error pointers on error
instead of NULL.
Use IS_ERR() to check the return value to fix this.

Fixes: b1ae6dc41eaa ("module: add in-kernel support for decompressing")
Signed-off-by: Miaoqian Lin 
Reviewed-by: Dmitry Torokhov 
Signed-off-by: Sasha Levin

module: tracking: Keep a record of tainted unloaded modules only

2022-10-10T19:16:19+00:00

This ensures that no module record/or entry is added to the
unloaded_tainted_modules list if it does not carry a taint.

Reported-by: Alexey Dobriyan 
Fixes: 99bd9956551b ("module: Introduce module unload taint tracking")
Signed-off-by: Aaron Tomlin 
Acked-by: Luis Chamberlain 
Signed-off-by: Linus Torvalds

Merge tag 'modules-6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux

2022-10-10T19:13:36+00:00

Pull module updates from Luis Chamberlain:

 - minor enhancement for sysfs compression string (David Disseldorp)

 - debugfs interface to view unloaded tainted modules (Aaron Tomlin)

* tag 'modules-6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux:
  module/decompress: generate sysfs string at compile time
  module: Add debugfs interface to view unloaded tainted modules

Merge tag 'driver-core-6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

2022-10-08T00:04:10+00:00

Pull driver core updates from Greg KH:
 "Here is the big set of driver core and debug printk changes for
  6.1-rc1. Included in here is:

   - dynamic debug updates for the core and the drm subsystem. The drm
     changes have all been acked by the relevant maintainers

   - kernfs fixes for syzbot reported problems

   - kernfs refactors and updates for cgroup requirements

   - magic number cleanups and removals from the kernel tree (they were
     not being used and they really did not actually do anything)

   - other tiny cleanups

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'driver-core-6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (74 commits)
  docs: filesystems: sysfs: Make text and code for ->show() consistent
  Documentation: NBD_REQUEST_MAGIC isn't a magic number
  a.out: restore CMAGIC
  device property: Add const qualifier to device_get_match_data() parameter
  drm_print: add _ddebug descriptor to drm_*dbg prototypes
  drm_print: prefer bare printk KERN_DEBUG on generic fn
  drm_print: optimize drm_debug_enabled for jump-label
  drm-print: add drm_dbg_driver to improve namespace symmetry
  drm-print.h: include dyndbg header
  drm_print: wrap drm_*_dbg in dyndbg descriptor factory macro
  drm_print: interpose drm_*dbg with forwarding macros
  drm: POC drm on dyndbg - use in core, 2 helpers, 3 drivers.
  drm_print: condense enum drm_debug_category
  debugfs: use DEFINE_SHOW_ATTRIBUTE to define debugfs_regset32_fops
  driver core: use IS_ERR_OR_NULL() helper in device_create_groups_vargs()
  Documentation: ENI155_MAGIC isn't a magic number
  Documentation: NBD_REPLY_MAGIC isn't a magic number
  nbd: remove define-only NBD_MAGIC, previously magic number
  Documentation: FW_HEADER_MAGIC isn't a magic number
  Documentation: EEPROM_MAGIC_VALUE isn't a magic number
  ...

cfi: Switch to -fsanitize=kcfi

2022-09-26T17:13:13+00:00

Switch from Clang's original forward-edge control-flow integrity
implementation to -fsanitize=kcfi, which is better suited for the
kernel, as it doesn't require LTO, doesn't use a jump table that
requires altering function references, and won't break cross-module
function address equality.

Signed-off-by: Sami Tolvanen 
Reviewed-by: Kees Cook 
Tested-by: Kees Cook 
Tested-by: Nathan Chancellor 
Acked-by: Peter Zijlstra (Intel) 
Tested-by: Peter Zijlstra (Intel) 
Signed-off-by: Kees Cook 
Link: https://lore.kernel.org/r/20220908215504.3686827-6-samitolvanen@google.com

cfi: Remove CONFIG_CFI_CLANG_SHADOW

2022-09-26T17:13:12+00:00

In preparation to switching to -fsanitize=kcfi, remove support for the
CFI module shadow that will no longer be needed.

Signed-off-by: Sami Tolvanen 
Reviewed-by: Kees Cook 
Tested-by: Kees Cook 
Tested-by: Nathan Chancellor 
Acked-by: Peter Zijlstra (Intel) 
Tested-by: Peter Zijlstra (Intel) 
Signed-off-by: Kees Cook 
Link: https://lore.kernel.org/r/20220908215504.3686827-4-samitolvanen@google.com

Merge 6.0-rc5 into driver-core-next

2022-09-12T14:51:22+00:00

We need the driver core and debugfs changes in this branch.

Signed-off-by: Greg Kroah-Hartman

module/decompress: generate sysfs string at compile time

2022-09-09T00:00:43+00:00

compression_show() before (with noinline):
   0xffffffff810b5ff0 <+0>:     mov    %rdx,%rdi
   0xffffffff810b5ff3 <+3>:     mov    $0xffffffff81b55629,%rsi
   0xffffffff810b5ffa <+10>:    mov    $0xffffffff81b0cde2,%rdx
   0xffffffff810b6001 <+17>:    call   0xffffffff811b8fd0 
   0xffffffff810b6006 <+22>:    cltq
   0xffffffff810b6008 <+24>:    ret

After:
   0xffffffff810b5ff0 <+0>:     mov    $0xffffffff81b0cde2,%rsi
   0xffffffff810b5ff7 <+7>:     mov    %rdx,%rdi
   0xffffffff810b5ffa <+10>:    call   0xffffffff811b8fd0 
   0xffffffff810b5fff <+15>:    cltq
   0xffffffff810b6001 <+17>:    ret

Signed-off-by: David Disseldorp 
Reviewed-by: Aaron Tomlin 
Reviewed-by: Dmitry Torokhov 
Signed-off-by: Luis Chamberlain

module: Add debugfs interface to view unloaded tainted modules

2022-09-08T23:50:07+00:00

This patch provides debug/modules/unloaded_tainted file to see a
record of unloaded tainted modules.

Signed-off-by: Aaron Tomlin 
Signed-off-by: Luis Chamberlain

kernel/module: add __dyndbg_classes section

2022-09-07T15:04:49+00:00

Add __dyndbg_classes section, using __dyndbg as a model. Use it:

vmlinux.lds.h:

KEEP the new section, which also silences orphan section warning on
loadable modules.  Add (__start_/__stop_)__dyndbg_classes linker
symbols for the c externs (below).

kernel/module/main.c:
- fill new fields in find_module_sections(), using section_objs()
- extend callchain prototypes
  to pass classes, length
  load_module(): pass new info to dynamic_debug_setup()
  dynamic_debug_setup(): new params, pass through to ddebug_add_module()

dynamic_debug.c:
- add externs to the linker symbols.

ddebug_add_module():
- It currently builds a debug_table, and *will* find and attach classes.

dynamic_debug_init():
- add class fields to the _ddebug_info cursor var: di.

Signed-off-by: Jim Cromie 
Link: https://lore.kernel.org/r/20220904214134.408619-16-jim.cromie@gmail.com
Signed-off-by: Greg Kroah-Hartman