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proc: add config & param to block forcing mem writes

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[ Upstream commit 41e8149c8892ed1962bd15350b3c3e6e90cba7f4 ]

This adds a Kconfig option and boot param to allow removing
the FOLL_FORCE flag from /proc/pid/mem write calls because
it can be abused.

The traditional forcing behavior is kept as default because
it can break GDB and some other use cases.

Previously we tried a more sophisticated approach allowing
distributions to fine-tune /proc/pid/mem behavior, however
that got NAK-ed by Linus [1], who prefers this simpler
approach with semantics also easier to understand for users.

Link: https://lore.kernel.org/lkml/CAHk-=wiGWLChxYmUA5HrT5aopZrB7_2VTa0NLZcxORgkUe5tEQ@mail.gmail.com/ [1]
Cc: Doug Anderson <[email protected]>
Cc: Jeff Xu <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Christian Brauner <[email protected]>
Suggested-by: Linus Torvalds <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Adrian Ratiu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Christian Brauner <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Adrian Ratiu 2024-08-02 11:02:25 +03:00 • committed by Greg Kroah-Hartman
commit 299b917594
3 changed files with 102 additions and 1 deletions
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10
Documentation/admin-guide/kernel-parameters.txt
View file

@ -3812,6 +3812,16 @@
printk.time= Show timing data prefixed to each printk message line
Format: <bool> (1/Y/y=enable, 0/N/n=disable)
proc_mem.force_override= [KNL]
Format: {always | ptrace | never}
Traditionally /proc/pid/mem allows memory permissions to be
overridden without restrictions. This option may be set to
restrict that. Can be one of:
- 'always': traditional behavior always allows mem overrides.
- 'ptrace': only allow mem overrides for active ptracers.
- 'never': never allow mem overrides.
If not specified, default is the CONFIG_PROC_MEM_* choice.
processor.max_cstate= [HW,ACPI]
Limit processor to maximum C-state
max_cstate=9 overrides any DMI blacklist limit.