From: Benjamin Berg <benjamin.b...@intel.com> Hi all,
here is an updated version of the SECCOMP patchset. The main improvement to the previous RFC version is that now FP registers will work correctly on 32 bit. I hope it is in a relatively good state overall, but I expect we will not merge this into 6.13. The patchset adds a new userspace handling mode to UML that is based on a SECCOMP filter and trusted code within each userspace process. One advantage of this approach is that it saves quite a few context switches when handling pagefaults (and syscalls to some extend). The reason is that the ptrace code needs a separate context switch to execute syscalls in the stub as well as another one to grab the segfault information. Benjamin RFCv2: - Fix FP handling on i386 - Improved MM list for userspace sigchild handling Benjamin Berg (9): um: Store full CSGSFS and SS register from mcontext um: Move faultinfo extraction into userspace routine um: Add UML_SECCOMP configuration option um: Add stub side of SECCOMP/futex based process handling um: Add helper functions to get/set state for SECCOMP um: Add SECCOMP support detection and initialization um: Track userspace children dying in SECCOMP mode um: Implement kernel side of SECCOMP based process handling um: pass FD for memory operations when needed arch/um/Kconfig | 19 + arch/um/include/asm/irq.h | 5 +- arch/um/include/asm/mmu.h | 3 + arch/um/include/shared/common-offsets.h | 4 + arch/um/include/shared/irq_user.h | 1 + arch/um/include/shared/os.h | 3 +- arch/um/include/shared/skas/mm_id.h | 13 + arch/um/include/shared/skas/skas.h | 6 + arch/um/include/shared/skas/stub-data.h | 21 +- arch/um/kernel/irq.c | 5 + arch/um/kernel/skas/mmu.c | 90 +++- arch/um/kernel/skas/stub.c | 131 +++++- arch/um/kernel/skas/stub_exe.c | 156 ++++++- arch/um/os-Linux/internal.h | 4 + arch/um/os-Linux/process.c | 31 ++ arch/um/os-Linux/registers.c | 4 +- arch/um/os-Linux/signal.c | 19 +- arch/um/os-Linux/skas/mem.c | 104 ++++- arch/um/os-Linux/skas/process.c | 493 +++++++++++++++------ arch/um/os-Linux/start_up.c | 148 ++++++- arch/x86/um/os-Linux/mcontext.c | 223 +++++++++- arch/x86/um/ptrace.c | 76 +++- arch/x86/um/shared/sysdep/kernel-offsets.h | 2 + arch/x86/um/shared/sysdep/mcontext.h | 10 + arch/x86/um/shared/sysdep/stub-data.h | 23 + arch/x86/um/shared/sysdep/stub.h | 2 + arch/x86/um/shared/sysdep/stub_32.h | 13 + arch/x86/um/shared/sysdep/stub_64.h | 14 + arch/x86/um/tls_32.c | 23 +- 29 files changed, 1437 insertions(+), 209 deletions(-) create mode 100644 arch/x86/um/shared/sysdep/stub-data.h -- 2.47.0
