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authorWill Drewry <wad@chromium.org>2012-04-12 16:48:01 -0500
committerJames Morris <james.l.morris@oracle.com>2012-04-14 11:13:21 +1000
commitbb6ea4301a1109afdacaee576fedbfcd7152fc86 (patch)
tree5412219057d8e0ec2a30d0a1ad4f6b7dd398c754 /arch/Kconfig
parenta0727e8ce513fe6890416da960181ceb10fbfae6 (diff)
seccomp: Add SECCOMP_RET_TRAP
Adds a new return value to seccomp filters that triggers a SIGSYS to be delivered with the new SYS_SECCOMP si_code. This allows in-process system call emulation, including just specifying an errno or cleanly dumping core, rather than just dying. Suggested-by: Markus Gutschke <markus@chromium.org> Suggested-by: Julien Tinnes <jln@chromium.org> Signed-off-by: Will Drewry <wad@chromium.org> Acked-by: Eric Paris <eparis@redhat.com> v18: - acked-by, rebase - don't mention secure_computing_int() anymore v15: - use audit_seccomp/skip - pad out error spacing; clean up switch (indan@nul.nu) v14: - n/a v13: - rebase on to 88ebdda6159ffc15699f204c33feb3e431bf9bdc v12: - rebase on to linux-next v11: - clarify the comment (indan@nul.nu) - s/sigtrap/sigsys v10: - use SIGSYS, syscall_get_arch, updates arch/Kconfig note suggested-by (though original suggestion had other behaviors) v9: - changes to SIGILL v8: - clean up based on changes to dependent patches v7: - introduction Signed-off-by: James Morris <james.l.morris@oracle.com>
Diffstat (limited to 'arch/Kconfig')
-rw-r--r--arch/Kconfig14
1 files changed, 9 insertions, 5 deletions
diff --git a/arch/Kconfig b/arch/Kconfig
index beaab68c13b..66aef13f603 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -219,11 +219,15 @@ config ARCH_WANT_OLD_COMPAT_IPC
config HAVE_ARCH_SECCOMP_FILTER
bool
help
- This symbol should be selected by an architecure if it provides
- asm/syscall.h, specifically syscall_get_arguments(),
- syscall_get_arch(), and syscall_set_return_value(). Additionally,
- its system call entry path must respect a return value of -1 from
- __secure_computing() and/or secure_computing().
+ This symbol should be selected by an architecure if it provides:
+ asm/syscall.h:
+ - syscall_get_arch()
+ - syscall_get_arguments()
+ - syscall_rollback()
+ - syscall_set_return_value()
+ SIGSYS siginfo_t support must be implemented.
+ __secure_computing()/secure_computing()'s return value must be
+ checked, with -1 resulting in the syscall being skipped.
config SECCOMP_FILTER
def_bool y