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Seccomp: initial small additions to the rules #2040

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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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9 changes: 9 additions & 0 deletions pkg/seccomp/default_linux.go
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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 Down Expand Up @@ -602,6 +609,7 @@ func DefaultProfile() *Seccomp {
"lookup_dcookie",
"perf_event_open",
"quotactl",
"quotactl_fd",
"setdomainname",
"sethostname",
"setns",
Expand All @@ -619,6 +627,7 @@ func DefaultProfile() *Seccomp {
"lookup_dcookie",
"perf_event_open",
"quotactl",
"quotactl_fd",
"setdomainname",
"sethostname",
"setns",
Expand Down
9 changes: 9 additions & 0 deletions pkg/seccomp/seccomp.json
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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 Down Expand Up @@ -675,6 +682,7 @@
"lookup_dcookie",
"perf_event_open",
"quotactl",
"quotactl_fd",
"setdomainname",
"sethostname",
"setns"
Expand All @@ -696,6 +704,7 @@
"lookup_dcookie",
"perf_event_open",
"quotactl",
"quotactl_fd",
"setdomainname",
"sethostname",
"setns"
Expand Down