From: Jinjie Ruan Date: Mon, 22 Dec 2025 11:47:24 +0000 (+0800) Subject: arm64/ptrace: Return early for ptrace_report_syscall_entry() error X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a3386301667ed03ba9baeb6a2629e726714cc9a7;p=thirdparty%2Fkernel%2Flinux.git arm64/ptrace: Return early for ptrace_report_syscall_entry() error The generic entry abort the syscall_trace_enter() sequence if ptrace_report_syscall_entry() errors out, but arm64 not. When ptrace requests interception, it should prevent all subsequent system-call processing, including audit and seccomp. In preparation for moving arm64 over to the generic entry code, return early if ptrace_report_syscall_entry() encounters an error. Reviewed-by: Kevin Brodsky Signed-off-by: Jinjie Ruan Signed-off-by: Will Deacon --- diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index 03fe2f8a4d540..f333791ffba6d 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -2372,15 +2372,18 @@ static __always_inline unsigned long ptrace_save_reg(struct pt_regs *regs, return saved_reg; } -static void report_syscall_entry(struct pt_regs *regs) +static int report_syscall_entry(struct pt_regs *regs) { unsigned long saved_reg; - int regno; + int regno, ret; saved_reg = ptrace_save_reg(regs, PTRACE_SYSCALL_ENTER, ®no); - if (ptrace_report_syscall_entry(regs)) + ret = ptrace_report_syscall_entry(regs); + if (ret) forget_syscall(regs); regs->regs[regno] = saved_reg; + + return ret; } static void report_syscall_exit(struct pt_regs *regs) @@ -2407,10 +2410,11 @@ static void report_syscall_exit(struct pt_regs *regs) int syscall_trace_enter(struct pt_regs *regs) { unsigned long flags = read_thread_flags(); + int ret; if (flags & (_TIF_SYSCALL_EMU | _TIF_SYSCALL_TRACE)) { - report_syscall_entry(regs); - if (flags & _TIF_SYSCALL_EMU) + ret = report_syscall_entry(regs); + if (ret || (flags & _TIF_SYSCALL_EMU)) return NO_SYSCALL; }