8ac270d1e2
Documents how system call filtering using Berkeley Packet
Filter programs works and how it may be used.
Includes an example for x86 and a semi-generic
example using a macro-based code generator.
Acked-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Will Drewry <wad@chromium.org>
Acked-by: Kees Cook <keescook@chromium.org>
v18: - added acked by
- update no new privs numbers
v17: - remove @compat note and add Pitfalls section for arch checking
(keescook@chromium.org)
v16: -
v15: -
v14: - rebase/nochanges
v13: - rebase on to 88ebdda615
v12: - comment on the ptrace_event use
- update arch support comment
- note the behavior of SECCOMP_RET_DATA when there are multiple filters
(keescook@chromium.org)
- lots of samples/ clean up incl 64-bit bpf-direct support
(markus@chromium.org)
- rebase to linux-next
v11: - overhaul return value language, updates (keescook@chromium.org)
- comment on do_exit(SIGSYS)
v10: - update for SIGSYS
- update for new seccomp_data layout
- update for ptrace option use
v9: - updated bpf-direct.c for SIGILL
v8: - add PR_SET_NO_NEW_PRIVS to the samples.
v7: - updated for all the new stuff in v7: TRAP, TRACE
- only talk about PR_SET_SECCOMP now
- fixed bad JLE32 check (coreyb@linux.vnet.ibm.com)
- adds dropper.c: a simple system call disabler
v6: - tweak the language to note the requirement of
PR_SET_NO_NEW_PRIVS being called prior to use. (luto@mit.edu)
v5: - update sample to use system call arguments
- adds a "fancy" example using a macro-based generator
- cleaned up bpf in the sample
- update docs to mention arguments
- fix prctl value (eparis@redhat.com)
- language cleanup (rdunlap@xenotime.net)
v4: - update for no_new_privs use
- minor tweaks
v3: - call out BPF <-> Berkeley Packet Filter (rdunlap@xenotime.net)
- document use of tentative always-unprivileged
- guard sample compilation for i386 and x86_64
v2: - move code to samples (corbet@lwn.net)
Signed-off-by: James Morris <james.l.morris@oracle.com>
39 lines
1.1 KiB
Makefile
39 lines
1.1 KiB
Makefile
# kbuild trick to avoid linker error. Can be omitted if a module is built.
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obj- := dummy.o
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hostprogs-$(CONFIG_SECCOMP) := bpf-fancy dropper
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bpf-fancy-objs := bpf-fancy.o bpf-helper.o
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HOSTCFLAGS_bpf-fancy.o += -I$(objtree)/usr/include
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HOSTCFLAGS_bpf-fancy.o += -idirafter $(objtree)/include
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HOSTCFLAGS_bpf-helper.o += -I$(objtree)/usr/include
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HOSTCFLAGS_bpf-helper.o += -idirafter $(objtree)/include
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HOSTCFLAGS_dropper.o += -I$(objtree)/usr/include
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HOSTCFLAGS_dropper.o += -idirafter $(objtree)/include
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dropper-objs := dropper.o
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# bpf-direct.c is x86-only.
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ifeq ($(SRCARCH),x86)
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# List of programs to build
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hostprogs-$(CONFIG_SECCOMP) += bpf-direct
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bpf-direct-objs := bpf-direct.o
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endif
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HOSTCFLAGS_bpf-direct.o += -I$(objtree)/usr/include
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HOSTCFLAGS_bpf-direct.o += -idirafter $(objtree)/include
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# Try to match the kernel target.
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ifeq ($(CONFIG_64BIT),)
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HOSTCFLAGS_bpf-direct.o += -m32
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HOSTCFLAGS_dropper.o += -m32
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HOSTCFLAGS_bpf-helper.o += -m32
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HOSTCFLAGS_bpf-fancy.o += -m32
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HOSTLOADLIBES_bpf-direct += -m32
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HOSTLOADLIBES_bpf-fancy += -m32
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HOSTLOADLIBES_dropper += -m32
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endif
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# Tell kbuild to always build the programs
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always := $(hostprogs-y)
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