diff options
Diffstat (limited to 'isolation.c')
| -rw-r--r-- | isolation.c | 67 |
1 files changed, 23 insertions, 44 deletions
diff --git a/isolation.c b/isolation.c index 4e6637d..6bae4d4 100644 --- a/isolation.c +++ b/isolation.c @@ -103,10 +103,8 @@ static void drop_caps_ep_except(uint64_t keep) struct __user_cap_data_struct data[CAP_WORDS]; int i; - if (syscall(SYS_capget, &hdr, data)) { - err("Couldn't get current capabilities: %s", strerror(errno)); - exit(EXIT_FAILURE); - } + if (syscall(SYS_capget, &hdr, data)) + die("Couldn't get current capabilities: %s", strerror(errno)); for (i = 0; i < CAP_WORDS; i++) { uint32_t mask = keep >> (32 * i); @@ -115,10 +113,8 @@ static void drop_caps_ep_except(uint64_t keep) data[i].permitted &= mask; } - if (syscall(SYS_capset, &hdr, data)) { - err("Couldn't drop capabilities: %s", strerror(errno)); - exit(EXIT_FAILURE); - } + if (syscall(SYS_capset, &hdr, data)) + die("Couldn't drop capabilities: %s", strerror(errno)); } /** @@ -154,26 +150,20 @@ static void clamp_caps(void) * normal operation, so carry on without it. */ if (prctl(PR_CAPBSET_DROP, i, 0, 0, 0) && - errno != EINVAL && errno != EPERM) { - err("Couldn't drop cap %i from bounding set: %s", + errno != EINVAL && errno != EPERM) + die("Couldn't drop cap %i from bounding set: %s", i, strerror(errno)); - exit(EXIT_FAILURE); - } } - if (syscall(SYS_capget, &hdr, data)) { - err("Couldn't get current capabilities: %s", strerror(errno)); - exit(EXIT_FAILURE); - } + if (syscall(SYS_capget, &hdr, data)) + die("Couldn't get current capabilities: %s", strerror(errno)); for (i = 0; i < CAP_WORDS; i++) data[i].inheritable = 0; - if (syscall(SYS_capset, &hdr, data)) { - err("Couldn't drop inheritable capabilities: %s", + if (syscall(SYS_capset, &hdr, data)) + die("Couldn't drop inheritable capabilities: %s", strerror(errno)); - exit(EXIT_FAILURE); - } } /** @@ -229,46 +219,35 @@ void isolate_user(uid_t uid, gid_t gid, bool use_userns, const char *userns, /* First set our UID & GID in the original namespace */ if (setgroups(0, NULL)) { /* If we don't have CAP_SETGID, this will EPERM */ - if (errno != EPERM) { - err("Can't drop supplementary groups: %s", + if (errno != EPERM) + die("Can't drop supplementary groups: %s", strerror(errno)); - exit(EXIT_FAILURE); - } } - if (setgid(gid) != 0) { - err("Can't set GID to %u: %s", gid, strerror(errno)); - exit(EXIT_FAILURE); - } + if (setgid(gid) != 0) + die("Can't set GID to %u: %s", gid, strerror(errno)); - if (setuid(uid) != 0) { - err("Can't set UID to %u: %s", uid, strerror(errno)); - exit(EXIT_FAILURE); - } + if (setuid(uid) != 0) + die("Can't set UID to %u: %s", uid, strerror(errno)); if (*userns) { /* If given a userns, join it */ int ufd; ufd = open(userns, O_RDONLY | O_CLOEXEC); - if (ufd < 0) { - err("Couldn't open user namespace %s: %s", + if (ufd < 0) + die("Couldn't open user namespace %s: %s", userns, strerror(errno)); - exit(EXIT_FAILURE); - } - if (setns(ufd, CLONE_NEWUSER) != 0) { - err("Couldn't enter user namespace %s: %s", + if (setns(ufd, CLONE_NEWUSER) != 0) + die("Couldn't enter user namespace %s: %s", userns, strerror(errno)); - exit(EXIT_FAILURE); - } close(ufd); } else if (use_userns) { /* Create and join a new userns */ - if (unshare(CLONE_NEWUSER) != 0) { - err("Couldn't create user namespace: %s", strerror(errno)); - exit(EXIT_FAILURE); - } + if (unshare(CLONE_NEWUSER) != 0) + die("Couldn't create user namespace: %s", + strerror(errno)); } /* Joining a new userns gives us full capabilities; drop the |