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sandbox/init: clear inheritable set
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Inheritable should not be able to affect anything regardless of its value, due to no_new_privs.

Signed-off-by: Ophestra <cat@gensokyo.uk>
This commit is contained in:
Ophestra 2025-03-26 07:46:13 +09:00
parent 18644d90be
commit d613257841
Signed by: cat
SSH Key Fingerprint: SHA256:gQ67O0enBZ7UdZypgtspB2FDM1g3GVw8nX0XSdcFw8Q
2 changed files with 11 additions and 2 deletions
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11
sandbox/init.go
View File

@ -217,7 +217,7 @@ func Init(prepare func(prefix string), setVerbose func(verbose bool)) {
}
/*
load seccomp filter
caps/securebits and seccomp filter
*/
if _, _, errno := syscall.Syscall(PR_SET_NO_NEW_PRIVS, 1, 0, 0); errno != 0 {
@ -228,9 +228,16 @@ func Init(prepare func(prefix string), setVerbose func(verbose bool)) {
}
for i := uintptr(0); i <= LastCap(); i++ {
if _, _, errno := syscall.Syscall(syscall.SYS_PRCTL, syscall.PR_CAPBSET_DROP, i, 0); errno != 0 {
log.Fatalf("cannot drop capability: %v", errno)
log.Fatalf("cannot drop capability from bonding set: %v", errno)
}
}
if err := capset(
&capHeader{_LINUX_CAPABILITY_VERSION_3, 0},
&[2]capData{{0, 0, 0}, {0, 0, 0}},
); err != nil {
log.Fatalf("cannot capset: %v", err)
}
if err := seccomp.Load(params.Flags.seccomp(params.Seccomp)); err != nil {
log.Fatalf("cannot load syscall filter: %v", err)
}

2
test/test.py
View File

@ -100,9 +100,11 @@ print(denyOutputVerbose)
print(machine.fail("sudo -u alice -i fsu"))
# Verify capabilities/securebits in user namespace:
print(machine.succeed("sudo -u alice -i fortify run capsh --print"))
print(machine.succeed("sudo -u alice -i fortify run capsh --has-no-new-privs"))
print(machine.fail("sudo -u alice -i fortify run capsh --has-a=CAP_SYS_ADMIN"))
print(machine.fail("sudo -u alice -i fortify run capsh --has-b=CAP_SYS_ADMIN"))
print(machine.fail("sudo -u alice -i fortify run capsh --has-i=CAP_SYS_ADMIN"))
print(machine.fail("sudo -u alice -i fortify run capsh --has-p=CAP_SYS_ADMIN"))
print(machine.fail("sudo -u alice -i fortify run umount -R /dev"))