uprobe,bpf: Allow to change app registers from uprobe registers #5968
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Currently uprobe (BPF_PROG_TYPE_KPROBE) program can't write to the context registers data. While this makes sense for kprobe attachments, for uprobe attachment it might make sense to be able to change user space registers to alter application execution. Since uprobe and kprobe programs share the same type (BPF_PROG_TYPE_KPROBE), we can't deny write access to context during the program load. We need to check on it during program attachment to see if it's going to be kprobe or uprobe. Storing the program's write attempt to context and checking on it during the attachment. Acked-by: Andrii Nakryiko <[email protected]> Signed-off-by: Jiri Olsa <[email protected]>
If uprobe handler changes instruction pointer we still execute single step) or emulate the original instruction and increment the (new) ip with its length. This makes the new instruction pointer bogus and application will likely crash on illegal instruction execution. If user decided to take execution elsewhere, it makes little sense to execute the original instruction, so let's skip it. Acked-by: Oleg Nesterov <[email protected]> Acked-by: Andrii Nakryiko <[email protected]> Signed-off-by: Jiri Olsa <[email protected]>
Adding test to check we can change common register values through uprobe program. It's x86_64 specific test. Acked-by: Andrii Nakryiko <[email protected]> Signed-off-by: Jiri Olsa <[email protected]>
Adding test to check we can change the application execution through instruction pointer change through uprobe program. It's x86_64 specific test. Acked-by: Andrii Nakryiko <[email protected]> Signed-off-by: Jiri Olsa <[email protected]>
Adding test to check we can't attach standard kprobe program that writes to the context. It's x86_64 specific test. Acked-by: Andrii Nakryiko <[email protected]> Signed-off-by: Jiri Olsa <[email protected]>
Adding test to check we can't attach kprobe multi program that writes to the context. It's x86_64 specific test. Acked-by: Andrii Nakryiko <[email protected]> Signed-off-by: Jiri Olsa <[email protected]>
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Pull request for series with
subject: uprobe,bpf: Allow to change app registers from uprobe registers
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1003090