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| author | YiFei Zhu <yifeifz2@illinois.edu> | 2020-09-24 07:44:16 -0500 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2020-10-08 13:17:47 -0700 |
| commit | 282a181b1a0d66de1f0894d82f395fcd478f51d1 (patch) | |
| tree | 0f054421aab972593cbc3d117048d478abd30d5a /arch/Kconfig | |
| parent | e953aeaa913bedcdabc168276ef41c83ae75f161 (diff) | |
| download | lwn-282a181b1a0d66de1f0894d82f395fcd478f51d1.tar.gz lwn-282a181b1a0d66de1f0894d82f395fcd478f51d1.zip | |
seccomp: Move config option SECCOMP to arch/Kconfig
In order to make adding configurable features into seccomp easier,
it's better to have the options at one single location, considering
especially that the bulk of seccomp code is arch-independent. An quick
look also show that many SECCOMP descriptions are outdated; they talk
about /proc rather than prctl.
As a result of moving the config option and keeping it default on,
architectures arm, arm64, csky, riscv, sh, and xtensa did not have SECCOMP
on by default prior to this and SECCOMP will be default in this change.
Architectures microblaze, mips, powerpc, s390, sh, and sparc have an
outdated depend on PROC_FS and this dependency is removed in this change.
Suggested-by: Jann Horn <jannh@google.com>
Link: https://lore.kernel.org/lkml/CAG48ez1YWz9cnp08UZgeieYRhHdqh-ch7aNwc4JRBnGyrmgfMg@mail.gmail.com/
Signed-off-by: YiFei Zhu <yifeifz2@illinois.edu>
[kees: added HAVE_ARCH_SECCOMP help text, tweaked wording]
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/9ede6ef35c847e58d61e476c6a39540520066613.1600951211.git.yifeifz2@illinois.edu
Diffstat (limited to 'arch/Kconfig')
| -rw-r--r-- | arch/Kconfig | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/Kconfig b/arch/Kconfig index af14a567b493..21a3675a7a3a 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -444,10 +444,23 @@ config ARCH_WANT_OLD_COMPAT_IPC select ARCH_WANT_COMPAT_IPC_PARSE_VERSION bool +config HAVE_ARCH_SECCOMP + bool + help + An arch should select this symbol to support seccomp mode 1 (the fixed + syscall policy), and must provide an overrides for __NR_seccomp_sigreturn, + and compat syscalls if the asm-generic/seccomp.h defaults need adjustment: + - __NR_seccomp_read_32 + - __NR_seccomp_write_32 + - __NR_seccomp_exit_32 + - __NR_seccomp_sigreturn_32 + config HAVE_ARCH_SECCOMP_FILTER bool + select HAVE_ARCH_SECCOMP help An arch should select this symbol if it provides all of these things: + - all the requirements for HAVE_ARCH_SECCOMP - syscall_get_arch() - syscall_get_arguments() - syscall_rollback() @@ -458,6 +471,23 @@ config HAVE_ARCH_SECCOMP_FILTER results in the system call being skipped immediately. - seccomp syscall wired up +config SECCOMP + prompt "Enable seccomp to safely execute untrusted bytecode" + def_bool y + depends on HAVE_ARCH_SECCOMP + help + This kernel feature is useful for number crunching applications + that may need to handle untrusted bytecode during their + execution. By using pipes or other transports made available + to the process as file descriptors supporting the read/write + syscalls, it's possible to isolate those applications in their + own address space using seccomp. Once seccomp is enabled via + prctl(PR_SET_SECCOMP) or the seccomp() syscall, it cannot be + disabled and the task is only allowed to execute a few safe + syscalls defined by each seccomp mode. + + If unsure, say Y. + config SECCOMP_FILTER def_bool y depends on HAVE_ARCH_SECCOMP_FILTER && SECCOMP && NET |