user/sven/linux.git/include/linux/init.h, branch v6.1.149

linux/init: remove __memexit* annotations

2024-02-23T08:12:38Z

commit 6a4e59eeedc3018cb57722eecfcbb49431aeb05f upstream. We have never used __memexit, __memexitdata, or __memexitconst. These were unneeded. Signed-off-by: Masahiro Yamada Acked-by: Arnd Bergmann [nathan: Remove additional case of XXXEXIT_TO_SOME_EXIT due to lack of 78dac1a22944 in 6.1] Signed-off-by: Nathan Chancellor Stable-dep-of: 846cfbeed09b ("um: Fix adding '-no-pie' for clang") Signed-off-by: Greg Kroah-Hartman

Merge tag 'mm-nonmm-stable-2022-10-11' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2022-10-12T18:00:22Z

Pull non-MM updates from Andrew Morton: - hfs and hfsplus kmap API modernization (Fabio Francesco) - make crash-kexec work properly when invoked from an NMI-time panic (Valentin Schneider) - ntfs bugfixes (Hawkins Jiawei) - improve IPC msg scalability by replacing atomic_t's with percpu counters (Jiebin Sun) - nilfs2 cleanups (Minghao Chi) - lots of other single patches all over the tree! * tag 'mm-nonmm-stable-2022-10-11' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (71 commits) include/linux/entry-common.h: remove has_signal comment of arch_do_signal_or_restart() prototype proc: test how it holds up with mapping'less process mailmap: update Frank Rowand email address ia64: mca: use strscpy() is more robust and safer init/Kconfig: fix unmet direct dependencies ia64: update config files nilfs2: replace WARN_ONs by nilfs_error for checkpoint acquisition failure fork: remove duplicate included header files init/main.c: remove unnecessary (void*) conversions proc: mark more files as permanent nilfs2: remove the unneeded result variable nilfs2: delete unnecessary checks before brelse() checkpatch: warn for non-standard fixes tag style usr/gen_init_cpio.c: remove unnecessary -1 values from int file ipc/msg: mitigate the lock contention with percpu counter percpu: add percpu_counter_add_local and percpu_counter_sub_local fs/ocfs2: fix repeated words in comments relay: use kvcalloc to alloc page array in relay_alloc_page_array proc: make config PROC_CHILDREN depend on PROC_FS fs: uninline inode_maybe_inc_iversion() ...

init.h: fix spelling typo in comment

2022-10-03T21:21:42Z

Fix spelling typo in comment. Link: https://lkml.kernel.org/r/20220905021034.947701-1-13667453960@163.com Signed-off-by: Jiangshan Yi Reported-by: k2ci Signed-off-by: Andrew Morton

treewide: Drop __cficanonical

2022-09-26T17:13:15Z

CONFIG_CFI_CLANG doesn't use a jump table anymore and therefore, won't change function references to point elsewhere. Remove the __cficanonical attribute and all uses of it. Note that the Clang definition of the attribute was removed earlier, just clean up the no-op definition and users. 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/20220908215504.3686827-16-samitolvanen@google.com

init: Drop nocfi from init

2022-09-26T17:13:14Z

It's no longer necessary to disable CFI checking for all __init functions. Drop the __nocfi attribute from __init. 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/20220908215504.3686827-13-samitolvanen@google.com

init.h: improve __setup and early_param documentation

2022-03-24T02:00:34Z

Igor noted in [1] that there are quite a few __setup() handling functions that return incorrect values. Doing this can be harmless, but it can also cause strings to be added to init's argument or environment list, polluting them. Since __setup() handling and return values are not documented, first add documentation for that. Also add more documentation for early_param() handling and return values. For __setup() functions, returning 0 (not handled) has questionable value if it is just a malformed option value, as in rodata=junk since returning 0 would just cause "rodata=junk" to be added to init's environment unnecessarily: Run /sbin/init as init process with arguments: /sbin/init with environment: HOME=/ TERM=linux splash=native rodata=junk Also, there are no recommendations on whether to print a warning when an unknown parameter value is seen. I am not addressing that here. [1] lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@omprussia.ru Link: https://lkml.kernel.org/r/20220221050852.1147-1-rdunlap@infradead.org Signed-off-by: Randy Dunlap Reported-by: Igor Zhbanov Cc: Ingo Molnar Cc: Greg Kroah-Hartman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

init: verify that function is initcall_t at compile-time

2021-05-24T22:24:33Z

In the spirit of making it hard to misuse an interface, add a compile-time assertion in the CONFIG_HAVE_ARCH_PREL32_RELOCATIONS case to verify the initcall function matches initcall_t, because the inline asm bypasses any type-checking the compiler would otherwise do. This will help developers catch incorrect API use in all configurations. A recent example of this is: https://lkml.kernel.org/r/20210514140015.2944744-1-arnd@kernel.org Signed-off-by: Marco Elver Reviewed-by: Miguel Ojeda Reviewed-by: Nathan Chancellor Tested-by: Nathan Chancellor Reviewed-by: Sami Tolvanen Tested-by: Paul E. McKenney Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20210521072610.2880286-1-elver@google.com

cfi: add __cficanonical

2021-04-08T23:04:20Z

With CONFIG_CFI_CLANG, the compiler replaces a function address taken in C code with the address of a local jump table entry, which passes runtime indirect call checks. However, the compiler won't replace addresses taken in assembly code, which will result in a CFI failure if we later jump to such an address in instrumented C code. The code generated for the non-canonical jump table looks this: : /* In C, &noncanonical points here */ jmp noncanonical ... : /* function body */ ... This change adds the __cficanonical attribute, which tells the compiler to use a canonical jump table for the function instead. This means the compiler will rename the actual function to .cfi and points the original symbol to the jump table entry instead: : /* jump table entry */ jmp canonical.cfi ... : /* function body */ ... As a result, the address taken in assembly, or other non-instrumented code always points to the jump table and therefore, can be used for indirect calls in instrumented code without tripping CFI checks. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook Acked-by: Bjorn Helgaas # pci.h Tested-by: Nathan Chancellor Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20210408182843.1754385-3-samitolvanen@google.com

add support for Clang CFI

2021-04-08T23:04:20Z

This change adds support for Clang’s forward-edge Control Flow Integrity (CFI) checking. With CONFIG_CFI_CLANG, the compiler injects a runtime check before each indirect function call to ensure the target is a valid function with the correct static type. This restricts possible call targets and makes it more difficult for an attacker to exploit bugs that allow the modification of stored function pointers. For more details, see: https://clang.llvm.org/docs/ControlFlowIntegrity.html Clang requires CONFIG_LTO_CLANG to be enabled with CFI to gain visibility to possible call targets. Kernel modules are supported with Clang’s cross-DSO CFI mode, which allows checking between independently compiled components. With CFI enabled, the compiler injects a __cfi_check() function into the kernel and each module for validating local call targets. For cross-module calls that cannot be validated locally, the compiler calls the global __cfi_slowpath_diag() function, which determines the target module and calls the correct __cfi_check() function. This patch includes a slowpath implementation that uses __module_address() to resolve call targets, and with CONFIG_CFI_CLANG_SHADOW enabled, a shadow map that speeds up module look-ups by ~3x. Clang implements indirect call checking using jump tables and offers two methods of generating them. With canonical jump tables, the compiler renames each address-taken function to .cfi and points the original symbol to a jump table entry, which passes __cfi_check() validation. This isn’t compatible with stand-alone assembly code, which the compiler doesn’t instrument, and would result in indirect calls to assembly code to fail. Therefore, we default to using non-canonical jump tables instead, where the compiler generates a local jump table entry .cfi_jt for each address-taken function, and replaces all references to the function with the address of the jump table entry. Note that because non-canonical jump table addresses are local to each component, they break cross-module function address equality. Specifically, the address of a global function will be different in each module, as it's replaced with the address of a local jump table entry. If this address is passed to a different module, it won’t match the address of the same function taken there. This may break code that relies on comparing addresses passed from other components. CFI checking can be disabled in a function with the __nocfi attribute. Additionally, CFI can be disabled for an entire compilation unit by filtering out CC_FLAGS_CFI. By default, CFI failures result in a kernel panic to stop a potential exploit. CONFIG_CFI_PERMISSIVE enables a permissive mode, where the kernel prints out a rate-limited warning instead, and allows execution to continue. This option is helpful for locating type mismatches, but should only be enabled during development. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook Tested-by: Nathan Chancellor Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20210408182843.1754385-2-samitolvanen@google.com

init: clean up early_param_on_off() macro

2021-02-26T17:41:05Z

Use early_param() to define early_param_on_off(). Link: https://lkml.kernel.org/r/20210201041532.4025025-1-masahiroy@kernel.org Signed-off-by: Masahiro Yamada Reviewed-by: Johan Hovold Reviewed-by: Miguel Ojeda Cc: Masahiro Yamada Cc: Joe Perches Cc: Nick Desaulniers Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

user/sven/linux.git/include/linux/init.h, branch v6.1.149

linux/init: remove __memexit* annotations

Merge tag 'mm-nonmm-stable-2022-10-11' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

init.h: fix spelling typo in comment

treewide: Drop __cficanonical

init: Drop __nocfi from __init

init.h: improve __setup and early_param documentation

init: verify that function is initcall_t at compile-time

cfi: add __cficanonical

add support for Clang CFI

init: clean up early_param_on_off() macro

init: Drop nocfi from init