um: Add helper functions to get/set state for SECCOMP

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When not using ptrace, we need to both save and restore registers
through the mcontext as provided by the host kernel to our signal
handlers.

Add corresponding functions to store the state to an mcontext and
helpers to access the mcontext of the subprocess through the stub data.

Signed-off-by: Benjamin Berg <benjamin@sipsolutions.net>
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Link: https://patch.msgid.link/20250602130052.545733-4-benjamin@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

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Benjamin Berg 2025-06-02 15:00:48 +02:00 • committed by Johannes Berg

parent dac494bf54

commit b1e1bd2e69

3 changed files with 283 additions and 20 deletions

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218

arch/x86/um/os-Linux/mcontext.c

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76

arch/x86/um/ptrace.c

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9

arch/x86/um/shared/sysdep/mcontext.h

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