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bpf: Check correct cred for CAP_SYSLOG in bpf_dump_raw_ok()

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commit 63960260457a02af2a6cb35d75e6bdb17299c882 upstream.

When evaluating access control over kallsyms visibility, credentials at
open() time need to be used, not the "current" creds (though in BPF's
case, this has likely always been the same). Plumb access to associated
file->f_cred down through bpf_dump_raw_ok() and its callers now that
kallsysm_show_value() has been refactored to take struct cred.

Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: bpf@vger.kernel.org
Cc: stable@vger.kernel.org
Fixes: 7105e828c0 ("bpf: allow for correlation of maps and helpers in dump")
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kees Cook 2020-07-02 15:45:23 -07:00 committed by Greg Kroah-Hartman
parent bff4fad828
commit b80e052c3a
3 changed files with 21 additions and 17 deletions
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4
include/linux/filter.h
View file

@ -752,12 +752,12 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog);
void bpf_jit_compile(struct bpf_prog *prog);
bool bpf_helper_changes_pkt_data(void *func);
static inline bool bpf_dump_raw_ok(void)
static inline bool bpf_dump_raw_ok(const struct cred *cred)
{
/* Reconstruction of call-sites is dependent on kallsyms,
* thus make dump the same restriction.
*/
return kallsyms_show_value(current_cred());
return kallsyms_show_value(cred);
}
struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off,

32
kernel/bpf/syscall.c
View file

@ -1903,7 +1903,8 @@ static const struct bpf_map *bpf_map_from_imm(const struct bpf_prog *prog,
return NULL;
}
static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog)
static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog,
const struct cred *f_cred)
{
const struct bpf_map *map;
struct bpf_insn *insns;
@ -1925,7 +1926,7 @@ static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog)
insns[i].code == (BPF_JMP | BPF_CALL_ARGS)) {
if (insns[i].code == (BPF_JMP | BPF_CALL_ARGS))
insns[i].code = BPF_JMP | BPF_CALL;
if (!bpf_dump_raw_ok())
if (!bpf_dump_raw_ok(f_cred))
insns[i].imm = 0;
continue;
}
@ -1942,7 +1943,7 @@ static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog)
continue;
}
if (!bpf_dump_raw_ok() &&
if (!bpf_dump_raw_ok(f_cred) &&
imm == (unsigned long)prog->aux) {
insns[i].imm = 0;
insns[i + 1].imm = 0;
@ -1953,7 +1954,8 @@ static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog)
return insns;
}
static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
static int bpf_prog_get_info_by_fd(struct file *file,
struct bpf_prog *prog,
const union bpf_attr *attr,
union bpf_attr __user *uattr)
{
@ -2010,11 +2012,11 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
struct bpf_insn *insns_sanitized;
bool fault;
if (prog->blinded && !bpf_dump_raw_ok()) {
if (prog->blinded && !bpf_dump_raw_ok(file->f_cred)) {
info.xlated_prog_insns = 0;
goto done;
}
insns_sanitized = bpf_insn_prepare_dump(prog);
insns_sanitized = bpf_insn_prepare_dump(prog, file->f_cred);
if (!insns_sanitized)
return -ENOMEM;
uinsns = u64_to_user_ptr(info.xlated_prog_insns);
@ -2048,7 +2050,7 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
}
if (info.jited_prog_len && ulen) {
if (bpf_dump_raw_ok()) {
if (bpf_dump_raw_ok(file->f_cred)) {
uinsns = u64_to_user_ptr(info.jited_prog_insns);
ulen = min_t(u32, info.jited_prog_len, ulen);
@ -2083,7 +2085,7 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
ulen = info.nr_jited_ksyms;
info.nr_jited_ksyms = prog->aux->func_cnt;
if (info.nr_jited_ksyms && ulen) {
if (bpf_dump_raw_ok()) {
if (bpf_dump_raw_ok(file->f_cred)) {
u64 __user *user_ksyms;
ulong ksym_addr;
u32 i;
@ -2107,7 +2109,7 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
ulen = info.nr_jited_func_lens;
info.nr_jited_func_lens = prog->aux->func_cnt;
if (info.nr_jited_func_lens && ulen) {
if (bpf_dump_raw_ok()) {
if (bpf_dump_raw_ok(file->f_cred)) {
u32 __user *user_lens;
u32 func_len, i;
@ -2132,7 +2134,8 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
return 0;
}
static int bpf_map_get_info_by_fd(struct bpf_map *map,
static int bpf_map_get_info_by_fd(struct file *file,
struct bpf_map *map,
const union bpf_attr *attr,
union bpf_attr __user *uattr)
{
@ -2174,7 +2177,8 @@ static int bpf_map_get_info_by_fd(struct bpf_map *map,
return 0;
}
static int bpf_btf_get_info_by_fd(struct btf *btf,
static int bpf_btf_get_info_by_fd(struct file *file,
struct btf *btf,
const union bpf_attr *attr,
union bpf_attr __user *uattr)
{
@ -2206,13 +2210,13 @@ static int bpf_obj_get_info_by_fd(const union bpf_attr *attr,
return -EBADFD;
if (f.file->f_op == &bpf_prog_fops)
err = bpf_prog_get_info_by_fd(f.file->private_data, attr,
err = bpf_prog_get_info_by_fd(f.file, f.file->private_data, attr,
uattr);
else if (f.file->f_op == &bpf_map_fops)
err = bpf_map_get_info_by_fd(f.file->private_data, attr,
err = bpf_map_get_info_by_fd(f.file, f.file->private_data, attr,
uattr);
else if (f.file->f_op == &btf_fops)
err = bpf_btf_get_info_by_fd(f.file->private_data, attr, uattr);
err = bpf_btf_get_info_by_fd(f.file, f.file->private_data, attr, uattr);
else
err = -EINVAL;

2
net/core/sysctl_net_core.c
View file

@ -270,7 +270,7 @@ static int proc_dointvec_minmax_bpf_enable(struct ctl_table *table, int write,
ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
if (write && !ret) {
if (jit_enable < 2 ||
(jit_enable == 2 && bpf_dump_raw_ok())) {
(jit_enable == 2 && bpf_dump_raw_ok(current_cred()))) {
*(int *)table->data = jit_enable;
if (jit_enable == 2)
pr_warn("bpf_jit_enable = 2 was set! NEVER use this in production, only for JIT debugging!\n");