user/sven/linux.git/kernel/module/internal.h, branch v6.0.15

module: Modify module_flags() to accept show_state argument

2022-07-15T00:40:23Z

No functional change. With this patch a given module's state information (i.e. 'mod->state') can be omitted from the specified buffer. Please note that this is in preparation to include the last unloaded module's taint flag(s), if available. Signed-off-by: Aaron Tomlin Signed-off-by: Luis Chamberlain

module: Fix selfAssignment cppcheck warning

2022-07-01T21:44:17Z

cppcheck reports the following warnings: kernel/module/main.c:1455:26: warning: Redundant assignment of 'mod->core_layout.size' to itself. [selfAssignment] mod->core_layout.size = strict_align(mod->core_layout.size); ^ kernel/module/main.c:1489:26: warning: Redundant assignment of 'mod->init_layout.size' to itself. [selfAssignment] mod->init_layout.size = strict_align(mod->init_layout.size); ^ kernel/module/main.c:1493:26: warning: Redundant assignment of 'mod->init_layout.size' to itself. [selfAssignment] mod->init_layout.size = strict_align(mod->init_layout.size); ^ kernel/module/main.c:1504:26: warning: Redundant assignment of 'mod->init_layout.size' to itself. [selfAssignment] mod->init_layout.size = strict_align(mod->init_layout.size); ^ kernel/module/main.c:1459:26: warning: Redundant assignment of 'mod->data_layout.size' to itself. [selfAssignment] mod->data_layout.size = strict_align(mod->data_layout.size); ^ kernel/module/main.c:1463:26: warning: Redundant assignment of 'mod->data_layout.size' to itself. [selfAssignment] mod->data_layout.size = strict_align(mod->data_layout.size); ^ kernel/module/main.c:1467:26: warning: Redundant assignment of 'mod->data_layout.size' to itself. [selfAssignment] mod->data_layout.size = strict_align(mod->data_layout.size); ^ This is due to strict_align() being a no-op when CONFIG_STRICT_MODULE_RWX is not selected. Transform strict_align() macro into an inline function. It will allow type checking and avoid the selfAssignment warning. Reported-by: kernel test robot Signed-off-by: Christophe Leroy Signed-off-by: Luis Chamberlain

module: Introduce module unload taint tracking

2022-05-12T17:29:41Z

Currently, only the initial module that tainted the kernel is recorded e.g. when an out-of-tree module is loaded. The purpose of this patch is to allow the kernel to maintain a record of each unloaded module that taints the kernel. So, in addition to displaying a list of linked modules (see print_modules()) e.g. in the event of a detected bad page, unloaded modules that carried a taint/or taints are displayed too. A tainted module unload count is maintained. The number of tracked modules is not fixed. This feature is disabled by default. Signed-off-by: Aaron Tomlin Signed-off-by: Luis Chamberlain

module: Move module_assert_mutex_or_preempt() to internal.h

2022-05-12T17:29:41Z

No functional change. This patch migrates module_assert_mutex_or_preempt() to internal.h. So, the aforementiond function can be used outside of main/or core module code yet will remain restricted for internal use only. Signed-off-by: Aaron Tomlin Signed-off-by: Luis Chamberlain

module: Make module_flags_taint() accept a module's taints bitmap and usable outside core code

2022-05-12T17:29:41Z

No functional change. The purpose of this patch is to modify module_flags_taint() to accept a module's taints bitmap as a parameter and modifies all users accordingly. Furthermore, it is now possible to access a given module's taint flags data outside of non-essential code yet does remain for internal use only. This is in preparation for module unload taint tracking support. Signed-off-by: Aaron Tomlin Signed-off-by: Luis Chamberlain

module: Add CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC

2022-04-05T15:43:05Z

Add CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC to allow architectures to request having modules data in vmalloc area instead of module area. This is required on powerpc book3s/32 in order to set data non executable, because it is not possible to set executability on page basis, this is done per 256 Mbytes segments. The module area has exec right, vmalloc area has noexec. This can also be useful on other powerpc/32 in order to maximize the chance of code being close enough to kernel core to avoid branch trampolines. Cc: Jason Wessel Acked-by: Daniel Thompson Cc: Douglas Anderson Signed-off-by: Christophe Leroy [mcgrof: rebased in light of kernel/module/kdb.c move] Signed-off-by: Luis Chamberlain

module: Introduce data_layout

2022-04-05T15:43:05Z

In order to allow separation of data from text, add another layout, called data_layout. For architectures requesting separation of text and data, only text will go in core_layout and data will go in data_layout. For architectures which keep text and data together, make data_layout an alias of core_layout, that way data_layout can be used for all data manipulations, regardless of whether data is in core_layout or data_layout. Signed-off-by: Christophe Leroy Signed-off-by: Luis Chamberlain

module: Prepare for handling several RB trees

2022-04-05T15:43:05Z

In order to separate text and data, we need to setup two rb trees. Modify functions to give the tree as a parameter. Signed-off-by: Christophe Leroy Signed-off-by: Luis Chamberlain

module: Always have struct mod_tree_root

2022-04-05T15:43:05Z

In order to separate text and data, we need to setup two rb trees. This means that struct mod_tree_root is required even without MODULES_TREE_LOOKUP. Signed-off-by: Christophe Leroy Reviewed-by: Aaron Tomlin Signed-off-by: Luis Chamberlain

module: Rename debug_align() as strict_align()

2022-04-05T15:43:04Z

debug_align() was added by commit 84e1c6bb38eb ("x86: Add RO/NX protection for loadable kernel modules") At that time the config item was CONFIG_DEBUG_SET_MODULE_RONX. But nowadays it has changed to CONFIG_STRICT_MODULE_RWX and debug_align() is confusing because it has nothing to do with DEBUG. Rename it strict_align() Signed-off-by: Christophe Leroy Signed-off-by: Luis Chamberlain