diff options
| author | Jinjie Ruan <ruanjinjie@huawei.com> | 2025-12-22 19:47:24 +0800 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2026-01-27 10:38:36 +0000 |
| commit | a3386301667ed03ba9baeb6a2629e726714cc9a7 (patch) | |
| tree | 901b68bf38e5dfc562e2b7b907ac6cbe82fc8ce4 | |
| parent | 741a9000173a036526eb2374e1ba34c466754f1c (diff) | |
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 <kevin.brodsky@arm.com>
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Signed-off-by: Will Deacon <will@kernel.org>
| -rw-r--r-- | arch/arm64/kernel/ptrace.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index 03fe2f8a4d54..f333791ffba6 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; } |