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| author | Jiri Olsa <jolsa@kernel.org> | 2025-07-20 13:21:19 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2025-08-21 20:09:20 +0200 |
| commit | 56101b69c9190667f473b9f93f8b6d8209aaa816 (patch) | |
| tree | 4804e46379770549703318f4f45d5bcfd39479b0 /arch/x86/entry | |
| parent | uprobes/x86: Add mapping for optimized uprobe trampolines (diff) | |
| download | linux-56101b69c9190667f473b9f93f8b6d8209aaa816.tar.gz linux-56101b69c9190667f473b9f93f8b6d8209aaa816.zip | |
uprobes/x86: Add uprobe syscall to speed up uprobe
Adding new uprobe syscall that calls uprobe handlers for given
'breakpoint' address.
The idea is that the 'breakpoint' address calls the user space
trampoline which executes the uprobe syscall.
The syscall handler reads the return address of the initial call
to retrieve the original 'breakpoint' address. With this address
we find the related uprobe object and call its consumers.
Adding the arch_uprobe_trampoline_mapping function that provides
uprobe trampoline mapping. This mapping is backed with one global
page initialized at __init time and shared by the all the mapping
instances.
We do not allow to execute uprobe syscall if the caller is not
from uprobe trampoline mapping.
The uprobe syscall ensures the consumer (bpf program) sees registers
values in the state before the trampoline was called.
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>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/20250720112133.244369-10-jolsa@kernel.org
Diffstat (limited to 'arch/x86/entry')
| -rw-r--r-- | arch/x86/entry/syscalls/syscall_64.tbl | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl index 92cf0fe2291e..ced2a1deecd7 100644 --- a/arch/x86/entry/syscalls/syscall_64.tbl +++ b/arch/x86/entry/syscalls/syscall_64.tbl @@ -345,6 +345,7 @@ 333 common io_pgetevents sys_io_pgetevents 334 common rseq sys_rseq 335 common uretprobe sys_uretprobe +336 common uprobe sys_uprobe # don't use numbers 387 through 423, add new calls after the last # 'common' entry 424 common pidfd_send_signal sys_pidfd_send_signal |