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author | David S. Miller <davem@davemloft.net> | 2020-05-15 10:43:52 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2020-05-15 10:43:52 -0700 |
commit | 3430223d393dd23734cc87177d704449cfc294a8 (patch) | |
tree | 8a82f0640e498d463d8b059aa0dabb27e5214b13 /tools/testing/selftests/bpf/test_verifier.c | |
parent | net: dsa: mt7530: fix VLAN setup (diff) | |
parent | Merge branch 'bpf-cap' (diff) | |
download | wireguard-linux-3430223d393dd23734cc87177d704449cfc294a8.tar.xz wireguard-linux-3430223d393dd23734cc87177d704449cfc294a8.zip |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
Alexei Starovoitov says:
====================
pull-request: bpf-next 2020-05-15
The following pull-request contains BPF updates for your *net-next* tree.
We've added 37 non-merge commits during the last 1 day(s) which contain
a total of 67 files changed, 741 insertions(+), 252 deletions(-).
The main changes are:
1) bpf_xdp_adjust_tail() now allows to grow the tail as well, from Jesper.
2) bpftool can probe CONFIG_HZ, from Daniel.
3) CAP_BPF is introduced to isolate user processes that use BPF infra and
to secure BPF networking services by dropping CAP_SYS_ADMIN requirement
in certain cases, from Alexei.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'tools/testing/selftests/bpf/test_verifier.c')
-rw-r--r-- | tools/testing/selftests/bpf/test_verifier.c | 44 |
1 files changed, 36 insertions, 8 deletions
diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c index 21a1ce219c1c..78a6bae56ea6 100644 --- a/tools/testing/selftests/bpf/test_verifier.c +++ b/tools/testing/selftests/bpf/test_verifier.c @@ -818,10 +818,18 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type, } } +struct libcap { + struct __user_cap_header_struct hdr; + struct __user_cap_data_struct data[2]; +}; + static int set_admin(bool admin) { cap_t caps; - const cap_value_t cap_val = CAP_SYS_ADMIN; + /* need CAP_BPF, CAP_NET_ADMIN, CAP_PERFMON to load progs */ + const cap_value_t cap_net_admin = CAP_NET_ADMIN; + const cap_value_t cap_sys_admin = CAP_SYS_ADMIN; + struct libcap *cap; int ret = -1; caps = cap_get_proc(); @@ -829,11 +837,26 @@ static int set_admin(bool admin) perror("cap_get_proc"); return -1; } - if (cap_set_flag(caps, CAP_EFFECTIVE, 1, &cap_val, + cap = (struct libcap *)caps; + if (cap_set_flag(caps, CAP_EFFECTIVE, 1, &cap_sys_admin, CAP_CLEAR)) { + perror("cap_set_flag clear admin"); + goto out; + } + if (cap_set_flag(caps, CAP_EFFECTIVE, 1, &cap_net_admin, admin ? CAP_SET : CAP_CLEAR)) { - perror("cap_set_flag"); + perror("cap_set_flag set_or_clear net"); goto out; } + /* libcap is likely old and simply ignores CAP_BPF and CAP_PERFMON, + * so update effective bits manually + */ + if (admin) { + cap->data[1].effective |= 1 << (38 /* CAP_PERFMON */ - 32); + cap->data[1].effective |= 1 << (39 /* CAP_BPF */ - 32); + } else { + cap->data[1].effective &= ~(1 << (38 - 32)); + cap->data[1].effective &= ~(1 << (39 - 32)); + } if (cap_set_proc(caps)) { perror("cap_set_proc"); goto out; @@ -1067,9 +1090,11 @@ fail_log: static bool is_admin(void) { + cap_flag_value_t net_priv = CAP_CLEAR; + bool perfmon_priv = false; + bool bpf_priv = false; + struct libcap *cap; cap_t caps; - cap_flag_value_t sysadmin = CAP_CLEAR; - const cap_value_t cap_val = CAP_SYS_ADMIN; #ifdef CAP_IS_SUPPORTED if (!CAP_IS_SUPPORTED(CAP_SETFCAP)) { @@ -1082,11 +1107,14 @@ static bool is_admin(void) perror("cap_get_proc"); return false; } - if (cap_get_flag(caps, cap_val, CAP_EFFECTIVE, &sysadmin)) - perror("cap_get_flag"); + cap = (struct libcap *)caps; + bpf_priv = cap->data[1].effective & (1 << (39/* CAP_BPF */ - 32)); + perfmon_priv = cap->data[1].effective & (1 << (38/* CAP_PERFMON */ - 32)); + if (cap_get_flag(caps, CAP_NET_ADMIN, CAP_EFFECTIVE, &net_priv)) + perror("cap_get_flag NET"); if (cap_free(caps)) perror("cap_free"); - return (sysadmin == CAP_SET); + return bpf_priv && perfmon_priv && net_priv == CAP_SET; } static void get_unpriv_disabled() |