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MIPS: ptrace: Fix syscall skipping via PTRACE_SYSCALL

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If tracer wanted to skip a syscall return value was always
overwritten with -ENOSYS. Fix this by checking against original
syscall number and only return -ENOSYS, if it is negative.

Fixes: b6318a903d ("MIPS/ptrace: Pick up ptrace/seccomp changed syscalls")
Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Thomas Bogendoerfer
2026-07-17 13:27:31 +02:00
parent 09fbaddec8
commit 5475c03fa2
1 changed files with 5 additions and 1 deletions
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6
arch/mips/kernel/ptrace.c
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@@ -1321,8 +1321,12 @@ long arch_ptrace(struct task_struct *child, long request,
*/
asmlinkage long syscall_trace_enter(struct pt_regs *regs)
{
long syscall;
user_exit();
syscall = current_thread_info()->syscall;
if (test_thread_flag(TIF_SYSCALL_TRACE)) {
if (ptrace_report_syscall_entry(regs))
return -1;
@@ -1342,7 +1346,7 @@ asmlinkage long syscall_trace_enter(struct pt_regs *regs)
* Negative syscall numbers are mistaken for rejected syscalls, but
* won't have had the return value set appropriately, so we do so now.
*/
if (current_thread_info()->syscall < 0)
if (syscall < 0)
syscall_set_return_value(current, regs, -ENOSYS, 0);
return current_thread_info()->syscall;
}