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runsc/fsgofer/filter: add Rules() for composable seccomp filters #12904

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runsc/fsgofer/filter: add Rules() for composable seccomp filters #12904

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17 changes: 14 additions & 3 deletions runsc/fsgofer/filter/filter.go
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Original file line number Diff line number Diff line change
Expand Up @@ -31,9 +31,13 @@ type Options struct {
CgoEnabled bool
}

// Install installs seccomp filters.
func Install(opt Options) error {
s := allowedSyscalls
// Rules returns the seccomp rules for a gofer process without installing
// them. Callers can merge additional rules before building and installing
// the seccomp program. This is useful for custom gofer implementations
// that need the stock gofer's baseline syscall allowlist but also require
// additional syscalls (e.g. for networking or namespace switching).
func Rules(opt Options) seccomp.SyscallRules {
s := allowedSyscalls.Copy()

if opt.ProfileEnabled {
report("profile enabled: syscall filters less restrictive!")
Expand Down Expand Up @@ -65,6 +69,13 @@ func Install(opt Options) error {
s.Merge(lisafsFilters)
}

return s
}

// Install installs seccomp filters.
func Install(opt Options) error {
s := Rules(opt)

program := &seccomp.Program{
RuleSets: []seccomp.RuleSet{
{
Expand Down
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