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uprobes/x86: Return error from uprobe syscall when not called from trampoline

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Currently uprobe syscall handles all errors with forcing SIGILL to current
process. As suggested by Andrii it'd be helpful for uprobe syscall detection
to return error value for the !in_uprobe_trampoline check.

This way we could just call uprobe syscall and based on return value we will
find out if the kernel has it.

Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Oleg Nesterov <oleg@redhat.com>
This commit is contained in:
Jiri Olsa 2025-09-05 22:57:29 +02:00 committed by Peter Zijlstra
parent 16ed389227
commit d3aeb6d97b
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/uprobes.c
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@ -810,7 +810,7 @@ SYSCALL_DEFINE0(uprobe)
/* Allow execution only from uprobe trampolines. */
if (!in_uprobe_trampoline(regs->ip))
goto sigill;
return -ENXIO;
err = copy_from_user(&args, (void __user *)regs->sp, sizeof(args));
if (err)