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Merge "do not rely on ALLOW_ERROR_INJECTION for fmod_ret" into bpf-next

Merge commit 5b481acab4 ("bpf: do not rely on ALLOW_ERROR_INJECTION for fmod_ret")
from hid tree into bpf-next.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Alexei Starovoitov 2022-12-07 13:49:11 -08:00
commit 0a6ea1ce82
4 changed files with 53 additions and 10 deletions
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2
include/linux/btf.h
View File

@ -478,8 +478,10 @@ struct btf *bpf_prog_get_target_btf(const struct bpf_prog *prog);
u32 *btf_kfunc_id_set_contains(const struct btf *btf,
enum bpf_prog_type prog_type,
u32 kfunc_btf_id);
u32 *btf_kfunc_is_modify_return(const struct btf *btf, u32 kfunc_btf_id);
int register_btf_kfunc_id_set(enum bpf_prog_type prog_type,
const struct btf_kfunc_id_set *s);
int register_btf_fmodret_id_set(const struct btf_kfunc_id_set *kset);
s32 btf_find_dtor_kfunc(struct btf *btf, u32 btf_id);
int register_btf_id_dtor_kfuncs(const struct btf_id_dtor_kfunc *dtors, u32 add_cnt,
struct module *owner);

30
kernel/bpf/btf.c
View File

@ -206,6 +206,7 @@ enum btf_kfunc_hook {
BTF_KFUNC_HOOK_STRUCT_OPS,
BTF_KFUNC_HOOK_TRACING,
BTF_KFUNC_HOOK_SYSCALL,
BTF_KFUNC_HOOK_FMODRET,
BTF_KFUNC_HOOK_MAX,
};
@ -7608,11 +7609,14 @@ u32 *btf_kfunc_id_set_contains(const struct btf *btf,
return __btf_kfunc_id_set_contains(btf, hook, kfunc_btf_id);
}
/* This function must be invoked only from initcalls/module init functions */
int register_btf_kfunc_id_set(enum bpf_prog_type prog_type,
const struct btf_kfunc_id_set *kset)
u32 *btf_kfunc_is_modify_return(const struct btf *btf, u32 kfunc_btf_id)
{
return __btf_kfunc_id_set_contains(btf, BTF_KFUNC_HOOK_FMODRET, kfunc_btf_id);
}
static int __register_btf_kfunc_id_set(enum btf_kfunc_hook hook,
const struct btf_kfunc_id_set *kset)
{
enum btf_kfunc_hook hook;
struct btf *btf;
int ret;
@ -7631,13 +7635,29 @@ int register_btf_kfunc_id_set(enum bpf_prog_type prog_type,
if (IS_ERR(btf))
return PTR_ERR(btf);
hook = bpf_prog_type_to_kfunc_hook(prog_type);
ret = btf_populate_kfunc_set(btf, hook, kset->set);
btf_put(btf);
return ret;
}
/* This function must be invoked only from initcalls/module init functions */
int register_btf_kfunc_id_set(enum bpf_prog_type prog_type,
const struct btf_kfunc_id_set *kset)
{
enum btf_kfunc_hook hook;
hook = bpf_prog_type_to_kfunc_hook(prog_type);
return __register_btf_kfunc_id_set(hook, kset);
}
EXPORT_SYMBOL_GPL(register_btf_kfunc_id_set);
/* This function must be invoked only from initcalls/module init functions */
int register_btf_fmodret_id_set(const struct btf_kfunc_id_set *kset)
{
return __register_btf_kfunc_id_set(BTF_KFUNC_HOOK_FMODRET, kset);
}
EXPORT_SYMBOL_GPL(register_btf_fmodret_id_set);
s32 btf_find_dtor_kfunc(struct btf *btf, u32 btf_id)
{
struct btf_id_dtor_kfunc_tab *tab = btf->dtor_kfunc_tab;

17
kernel/bpf/verifier.c
View File

@ -16519,12 +16519,22 @@ int bpf_check_attach_target(struct bpf_verifier_log *log,
ret = -EINVAL;
switch (prog->type) {
case BPF_PROG_TYPE_TRACING:
/* fentry/fexit/fmod_ret progs can be sleepable only if they are
/* fentry/fexit/fmod_ret progs can be sleepable if they are
* attached to ALLOW_ERROR_INJECTION and are not in denylist.
*/
if (!check_non_sleepable_error_inject(btf_id) &&
within_error_injection_list(addr))
ret = 0;
/* fentry/fexit/fmod_ret progs can also be sleepable if they are
* in the fmodret id set with the KF_SLEEPABLE flag.
*/
else {
u32 *flags = btf_kfunc_is_modify_return(btf, btf_id);
if (flags && (*flags & KF_SLEEPABLE))
ret = 0;
}
break;
case BPF_PROG_TYPE_LSM:
/* LSM progs check that they are attached to bpf_lsm_*() funcs.
@ -16545,7 +16555,10 @@ int bpf_check_attach_target(struct bpf_verifier_log *log,
bpf_log(log, "can't modify return codes of BPF programs\n");
return -EINVAL;
}
ret = check_attach_modify_return(addr, tname);
ret = -EINVAL;
if (btf_kfunc_is_modify_return(btf, btf_id) ||
!check_attach_modify_return(addr, tname))
ret = 0;
if (ret) {
bpf_log(log, "%s() is not modifiable\n", tname);
return ret;

14
net/bpf/test_run.c
View File

@ -489,7 +489,6 @@ int noinline bpf_fentry_test1(int a)
return a + 1;
}
EXPORT_SYMBOL_GPL(bpf_fentry_test1);
ALLOW_ERROR_INJECTION(bpf_fentry_test1, ERRNO);
int noinline bpf_fentry_test2(int a, u64 b)
{
@ -733,7 +732,15 @@ noinline void bpf_kfunc_call_test_destructive(void)
__diag_pop();
ALLOW_ERROR_INJECTION(bpf_modify_return_test, ERRNO);
BTF_SET8_START(bpf_test_modify_return_ids)
BTF_ID_FLAGS(func, bpf_modify_return_test)
BTF_ID_FLAGS(func, bpf_fentry_test1, KF_SLEEPABLE)
BTF_SET8_END(bpf_test_modify_return_ids)
static const struct btf_kfunc_id_set bpf_test_modify_return_set = {
.owner = THIS_MODULE,
.set = &bpf_test_modify_return_ids,
};
BTF_SET8_START(test_sk_check_kfunc_ids)
BTF_ID_FLAGS(func, bpf_kfunc_call_test1)
@ -1666,7 +1673,8 @@ static int __init bpf_prog_test_run_init(void)
};
int ret;
ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, &bpf_prog_test_kfunc_set);
ret = register_btf_fmodret_id_set(&bpf_test_modify_return_set);
ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, &bpf_prog_test_kfunc_set);
ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &bpf_prog_test_kfunc_set);
ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &bpf_prog_test_kfunc_set);
return ret ?: register_btf_id_dtor_kfuncs(bpf_prog_test_dtor_kfunc,