[PATCH v7 2/7] signal: Expose SYS_USER_DISPATCH si_code type

Gabriel Krisman Bertazi
2020-11-18T03:29:27Z

SYS_USER_DISPATCH will be triggered when a syscall is sent to userspace
by the Syscall User Dispatch mechanism. This adjusts eventual
BUILD_BUG_ON around the tree.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
---
arch/x86/kernel/signal_compat.c | 2 +-
include/uapi/asm-generic/siginfo.h | 3 ++-
2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/signal_compat.c b/arch/x86/kernel/signal_compat.c
index a7f3e12cfbdb..d7b51870f16b 100644
--- a/arch/x86/kernel/signal_compat.c
+++ b/arch/x86/kernel/signal_compat.c
@@ -31,7 +31,7 @@ static inline void signal_compat_build_tests(void)
BUILD_BUG_ON(NSIGBUS != 5);
BUILD_BUG_ON(NSIGTRAP != 5);
BUILD_BUG_ON(NSIGCHLD != 6);
- BUILD_BUG_ON(NSIGSYS != 1);
+ BUILD_BUG_ON(NSIGSYS != 2);

/* This is part of the ABI and can never change in size: */
BUILD_BUG_ON(sizeof(compat_siginfo_t) != 128);
diff --git a/include/uapi/asm-generic/siginfo.h b/include/uapi/asm-generic/siginfo.h
index 7aacf9389010..d2597000407a 100644
--- a/include/uapi/asm-generic/siginfo.h
+++ b/include/uapi/asm-generic/siginfo.h
@@ -286,7 +286,8 @@ typedef struct siginfo {
* SIGSYS si_codes
*/
#define SYS_SECCOMP 1 /* seccomp triggered */
-#define NSIGSYS 1
+#define SYS_USER_DISPATCH 2 /* syscall user dispatch triggered */
+#define NSIGSYS 2

/*
* SIGEMT si_codes
--
2.29.2