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Seccomp: initial small additions to the rules #2040

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Merged
merged 9 commits into from
Jun 7, 2024
Merged

Seccomp: initial small additions to the rules #2040

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fd7d4a3
seccomp: remove obsolete sigaction family syscalls
martinetd Jun 4, 2024
aa9e144
seccomp: remove 'timerfd'
martinetd Jun 4, 2024
a3f335c
seccomp: explicitly block new (already blocked) syscalls
martinetd Jun 4, 2024
68c9579
seccomp: ppc64le: allow swapcontext
martinetd Jun 4, 2024
b12e6be
seccomp: riscv: add riscv_flush_icache
martinetd Jun 4, 2024
fa18956
seccomp: deny readdir()
martinetd Jun 4, 2024
6dd328a
seccomp: allow bpf() if CAP_BPF
martinetd Jun 4, 2024
daa81f1
seccomp: allow perf_event_open if CAP_PERFMON
martinetd Jun 4, 2024
d3283f8
seccomp: block syscall()
martinetd Jun 4, 2024
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74 changes: 65 additions & 9 deletions pkg/seccomp/default_linux.go
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -51,9 +51,16 @@ func DefaultProfile() *Seccomp {
{
Names: []string{
"bdflush",
"cachestat",
"futex_requeue",
"futex_wait",
"futex_waitv",
"futex_wake",
"io_pgetevents",
"io_pgetevents_time64",
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Lets block io_getenvents,

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If we block io_getevents too I think programs using libaio will stop working; this is just listing a syscall that was already blocked.
I agree the hardened profile can definitely block the io_{setup,destroy,cancel,getevents,submit} family of syscalls like we have io_uring blocked, but I'm not sure we should block them here.

Perhaps for podman 6.0 defaults?

"kexec_file_load",
"kexec_load",
"map_shadow_stack",
"migrate_pages",
"move_pages",
"nfsservctl",
Expand All @@ -68,9 +75,9 @@ func DefaultProfile() *Seccomp {
"pciconfig_write",
"sgetmask",
"ssetmask",
"swapcontext",
"swapoff",
"swapon",
"syscall",
"sysfs",
"uselib",
"userfaultfd",
Expand Down Expand Up @@ -310,7 +317,6 @@ func DefaultProfile() *Seccomp {
"pwritev2",
"read",
"readahead",
"readdir",
"readlink",
"readlinkat",
"readv",
Expand Down Expand Up @@ -398,15 +404,12 @@ func DefaultProfile() *Seccomp {
"shmdt",
"shmget",
"shutdown",
"sigaction",
"sigaltstack",
"signal",
"signalfd",
"signalfd4",
"sigpending",
"sigprocmask",
"sigreturn",
"sigsuspend",
"socketcall",
"socketpair",
"splice",
Expand All @@ -420,7 +423,6 @@ func DefaultProfile() *Seccomp {
"sync",
"sync_file_range",
"syncfs",
"syscall",
"sysinfo",
"syslog",
"tee",
Expand All @@ -433,7 +435,6 @@ func DefaultProfile() *Seccomp {
"timer_gettime64",
"timer_settime",
"timer_settime64",
"timerfd",
"timerfd_create",
"timerfd_gettime",
"timerfd_gettime64",
Expand Down Expand Up @@ -523,6 +524,7 @@ func DefaultProfile() *Seccomp {
{
Names: []string{
"sync_file_range2",
"swapcontext",
},
Action: ActAllow,
Args: []*Arg{},
Expand Down Expand Up @@ -577,6 +579,16 @@ func DefaultProfile() *Seccomp {
Arches: []string{"s390", "s390x"},
},
},
{
Names: []string{
"riscv_flush_icache",
},
Action: ActAllow,
Args: []*Arg{},
Includes: Filter{
Arches: []string{"riscv64"},
},
},
{
Names: []string{
"open_by_handle_at",
Expand Down Expand Up @@ -604,8 +616,8 @@ func DefaultProfile() *Seccomp {
"bpf",
"fanotify_init",
"lookup_dcookie",
"perf_event_open",
"quotactl",
"quotactl_fd",
"setdomainname",
"sethostname",
"setns",
Expand All @@ -618,11 +630,11 @@ func DefaultProfile() *Seccomp {
},
{
Names: []string{
"bpf",
"fanotify_init",
"lookup_dcookie",
"perf_event_open",
"quotactl",
"quotactl_fd",
"setdomainname",
"sethostname",
"setns",
Expand Down Expand Up @@ -885,6 +897,50 @@ func DefaultProfile() *Seccomp {
Caps: []string{"CAP_AUDIT_WRITE"},
},
},
{
Names: []string{
"bpf",
},
Action: ActErrno,
Errno: "EPERM",
ErrnoRet: &eperm,
Args: []*Arg{},
Excludes: Filter{
Caps: []string{"CAP_SYS_ADMIN", "CAP_BPF"},
},
},
{
Names: []string{
"bpf",
},
Action: ActAllow,
Args: []*Arg{},
Includes: Filter{
Caps: []string{"CAP_BPF"},
},
},
{
Names: []string{
"perf_event_open",
},
Action: ActErrno,
Errno: "EPERM",
ErrnoRet: &eperm,
Args: []*Arg{},
Excludes: Filter{
Caps: []string{"CAP_SYS_ADMIN", "CAP_BPF"},
},
},
{
Names: []string{
"perf_event_open",
},
Action: ActAllow,
Args: []*Arg{},
Includes: Filter{
Caps: []string{"CAP_PERFMON"},
},
},
}

return &Seccomp{
Expand Down
98 changes: 88 additions & 10 deletions pkg/seccomp/seccomp.json
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -55,9 +55,16 @@
{
"names": [
"bdflush",
"cachestat",
"futex_requeue",
"futex_wait",
"futex_waitv",
"futex_wake",
"io_pgetevents",
"io_pgetevents_time64",
"kexec_file_load",
"kexec_load",
"map_shadow_stack",
"migrate_pages",
"move_pages",
"nfsservctl",
Expand All @@ -72,9 +79,9 @@
"pciconfig_write",
"sgetmask",
"ssetmask",
"swapcontext",
"swapoff",
"swapon",
"syscall",
"sysfs",
"uselib",
"userfaultfd",
Expand Down Expand Up @@ -317,7 +324,6 @@
"pwritev2",
"read",
"readahead",
"readdir",
"readlink",
"readlinkat",
"readv",
Expand Down Expand Up @@ -405,15 +411,12 @@
"shmdt",
"shmget",
"shutdown",
"sigaction",
"sigaltstack",
"signal",
"signalfd",
"signalfd4",
"sigpending",
"sigprocmask",
"sigreturn",
"sigsuspend",
"socketcall",
"socketpair",
"splice",
Expand All @@ -427,7 +430,6 @@
"sync",
"sync_file_range",
"syncfs",
"syscall",
"sysinfo",
"syslog",
"tee",
Expand All @@ -440,7 +442,6 @@
"timer_gettime64",
"timer_settime",
"timer_settime64",
"timerfd",
"timerfd_create",
"timerfd_gettime",
"timerfd_gettime64",
Expand Down Expand Up @@ -562,7 +563,8 @@
},
{
"names": [
"sync_file_range2"
"sync_file_range2",
"swapcontext"
],
"action": "SCMP_ACT_ALLOW",
"args": [],
Expand Down Expand Up @@ -642,6 +644,20 @@
},
"excludes": {}
},
{
"names": [
"riscv_flush_icache"
],
"action": "SCMP_ACT_ALLOW",
"args": [],
"comment": "",
"includes": {
"arches": [
"riscv64"
]
},
"excludes": {}
},
{
"names": [
"open_by_handle_at"
Expand Down Expand Up @@ -677,8 +693,8 @@
"bpf",
"fanotify_init",
"lookup_dcookie",
"perf_event_open",
"quotactl",
"quotactl_fd",
"setdomainname",
"sethostname",
"setns"
Expand All @@ -695,11 +711,11 @@
},
{
"names": [
"bpf",
"fanotify_init",
"lookup_dcookie",
"perf_event_open",
"quotactl",
"quotactl_fd",
"setdomainname",
"sethostname",
"setns"
Expand Down Expand Up @@ -1047,6 +1063,68 @@
]
},
"excludes": {}
},
{
"names": [
"bpf"
],
"action": "SCMP_ACT_ERRNO",
"args": [],
"comment": "",
"includes": {},
"excludes": {
"caps": [
"CAP_SYS_ADMIN",
"CAP_BPF"
]
},
"errnoRet": 1,
"errno": "EPERM"
},
{
"names": [
"bpf"
],
"action": "SCMP_ACT_ALLOW",
"args": [],
"comment": "",
"includes": {
"caps": [
"CAP_BPF"
]
},
"excludes": {}
},
{
"names": [
"perf_event_open"
],
"action": "SCMP_ACT_ERRNO",
"args": [],
"comment": "",
"includes": {},
"excludes": {
"caps": [
"CAP_SYS_ADMIN",
"CAP_BPF"
]
},
"errnoRet": 1,
"errno": "EPERM"
},
{
"names": [
"perf_event_open"
],
"action": "SCMP_ACT_ALLOW",
"args": [],
"comment": "",
"includes": {
"caps": [
"CAP_PERFMON"
]
},
"excludes": {}
}
]
}