André Rösti 4da4630810 entry: Respect changes to system call number by trace_sys_enter() ... [ Upstream commit fb13b11d53875e28e7fbf0c26b288e4ea676aa9f ] When a probe is registered at the trace_sys_enter() tracepoint, and that probe changes the system call number, the old system call still gets executed. This worked correctly until commit b6ec413461 ("core/entry: Report syscall correctly for trace and audit"), which removed the re-evaluation of the syscall number after the trace point. Restore the original semantics by re-evaluating the system call number after trace_sys_enter(). The performance impact of this re-evaluation is minimal because it only takes place when a trace point is active, and compared to the actual trace point overhead the read from a cache hot variable is negligible. Fixes: b6ec413461 ("core/entry: Report syscall correctly for trace and audit") Signed-off-by: André Rösti <an.roesti@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20240311211704.7262-1-an.roesti@gmail.com Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-04-03 15:28:50 +02:00
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Makefile	kernel: Implement selective syscall userspace redirection	2020-12-02 15:07:56 +01:00
common.c	entry: Respect changes to system call number by trace_sys_enter()	2024-04-03 15:28:50 +02:00
common.h	kernel: Implement selective syscall userspace redirection	2020-12-02 15:07:56 +01:00
kvm.c	entry/kvm: Exit to user mode when TIF_NOTIFY_SIGNAL is set	2022-06-07 11:19:00 -04:00
syscall_user_dispatch.c	ptrace: Provide set/get interface for syscall user dispatch	2023-04-16 14:23:07 +02:00