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authorGabriel Krisman Bertazi <krisman@collabora.com>2020-11-27 22:32:35 +0300
committerThomas Gleixner <tglx@linutronix.de>2020-12-02 17:07:56 +0300
commit11894468e39def270199f845b76df6c36d4ed133 (patch)
tree5f5a91a5900bcdf378b5facb3b9479db70036367 /include/linux/entry-common.h
parent1446e1df9eb183fdf81c3f0715402f1d7595d4cb (diff)
downloadlinux-11894468e39def270199f845b76df6c36d4ed133.tar.xz
entry: Support Syscall User Dispatch on common syscall entry
Syscall User Dispatch (SUD) must take precedence over seccomp and ptrace, since the use case is emulation (it can be invoked with a different ABI) such that seccomp filtering by syscall number doesn't make sense in the first place. In addition, either the syscall is dispatched back to userspace, in which case there is no resource for to trace, or the syscall will be executed, and seccomp/ptrace will execute next. Since SUD runs before tracepoints, it needs to be a SYSCALL_WORK_EXIT as well, just to prevent a trace exit event when dispatch was triggered. For that, the on_syscall_dispatch() examines context to skip the tracepoint, audit and other work. [ tglx: Add a comment on the exit side ] Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Andy Lutomirski <luto@kernel.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20201127193238.821364-5-krisman@collabora.com
Diffstat (limited to 'include/linux/entry-common.h')
-rw-r--r--include/linux/entry-common.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/entry-common.h b/include/linux/entry-common.h
index 49b26b216e4e..a6e98b4ba8e9 100644
--- a/include/linux/entry-common.h
+++ b/include/linux/entry-common.h
@@ -44,10 +44,12 @@
SYSCALL_WORK_SYSCALL_TRACE | \
SYSCALL_WORK_SYSCALL_EMU | \
SYSCALL_WORK_SYSCALL_AUDIT | \
+ SYSCALL_WORK_SYSCALL_USER_DISPATCH | \
ARCH_SYSCALL_WORK_ENTER)
#define SYSCALL_WORK_EXIT (SYSCALL_WORK_SYSCALL_TRACEPOINT | \
SYSCALL_WORK_SYSCALL_TRACE | \
SYSCALL_WORK_SYSCALL_AUDIT | \
+ SYSCALL_WORK_SYSCALL_USER_DISPATCH | \
ARCH_SYSCALL_WORK_EXIT)
/*