In the default seccomp rule, allow use of 32 bit syscalls on
64 bit architectures, so you can run x86 Linux images on x86_64
without disabling seccomp or using a custom rule.
Signed-off-by: Justin Cormack <justin.cormack@unikernel.com>
Being able to obtain a file handle is no use as we cannot perform
any operation in it, and it may leak kernel state.
Signed-off-by: Justin Cormack <justin.cormack@unikernel.com>
This can be allowed because it should only restrict more per the seccomp docs, and multiple apps use it today.
Signed-off-by: Jessica Frazelle <acidburn@docker.com>
Block kcmp, procees_vm_readv, process_vm_writev.
All these require CAP_PTRACE, and are only used for ptrace related
actions, so are not useful as we block ptrace.
Signed-off-by: Justin Cormack <justin.cormack@unikernel.com>
The bpf syscall can load code into the kernel which may
persist beyond container lifecycle. Requires CAP_SYS_ADMIN
already.
Signed-off-by: Justin Cormack <justin.cormack@unikernel.com>
These provide an in kernel virtual machine for x86 real mode on x86
used by one very early DOS emulator. Not required for any normal use.
Signed-off-by: Justin Cormack <justin.cormack@unikernel.com>
The stime syscall is a legacy syscall on some architectures
to set the clock, should be blocked as time is not namespaced.
Signed-off-by: Justin Cormack <justin.cormack@unikernel.com>
clock_adjtime is the new posix style version of adjtime allowing
a specific clock to be specified. Time is not namespaced, so do
not allow.
Signed-off-by: Justin Cormack <justin.cormack@unikernel.com>
This is a new version of init_module that takes a file descriptor
rather than a file name.
Signed-off-by: Justin Cormack <justin.cormack@unikernel.com>
