bpf: Fix attaching fentry/fexit/fmod_ret/lsm to modules

This resolves two problems with attachment of fentry/fexit/fmod_ret/lsm
to functions located in modules:

1. The verifier tries to find the address to attach to in kallsyms. This
   is always done by searching the entire kallsyms, not respecting the
   module in which the function is located. Such approach causes an
   incorrect attachment address to be computed if the function to attach
   to is shadowed by a function of the same name located earlier in
   kallsyms.

2. If the address to attach to is located in a module, the module
   reference is only acquired in register_fentry. If the module is
   unloaded between the place where the address is found
   (bpf_check_attach_target in the verifier) and register_fentry, it is
   possible that another module is loaded to the same address which may
   lead to potential errors.

Since the attachment must contain the BTF of the program to attach to,
we extract the module from it and search for the function address in the
correct module (resolving problem no. 1). Then, the module reference is
taken directly in bpf_check_attach_target and stored in the bpf program
(in bpf_prog_aux). The reference is only released when the program is
unloaded (resolving problem no. 2).

Signed-off-by: Viktor Malik <vmalik@redhat.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Link: https://lore.kernel.org/r/3f6a9d8ae850532b5ef864ef16327b0f7a669063.1678432753.git.vmalik@redhat.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

4 files changed, 28 insertions, 29 deletions

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 5b88301a2ae0..099e9068bcdd 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -2067,6 +2067,7 @@ static void __bpf_prog_put_noref(struct bpf_prog *prog, bool deferred)
 {
 	bpf_prog_kallsyms_del_all(prog);
 	btf_put(prog->aux->btf);
+	module_put(prog->aux->mod);
 	kvfree(prog->aux->jited_linfo);
 	kvfree(prog->aux->linfo);
 	kfree(prog->aux->kfunc_tab);
@@ -3113,6 +3114,11 @@ static int bpf_tracing_prog_attach(struct bpf_prog *prog,
 		if (err)
 			goto out_unlock;
 
+		if (tgt_info.tgt_mod) {
+			module_put(prog->aux->mod);
+			prog->aux->mod = tgt_info.tgt_mod;
+		}
+
 		tr = bpf_trampoline_get(key, &tgt_info);
 		if (!tr) {
 			err = -ENOMEM;
diff --git a/kernel/bpf/trampoline.c b/kernel/bpf/trampoline.c
index d0ed7d6f5eec..f61d5138b12b 100644
--- a/kernel/bpf/trampoline.c
+++ b/kernel/bpf/trampoline.c
@@ -9,7 +9,6 @@
 #include <linux/btf.h>
 #include <linux/rcupdate_trace.h>
 #include <linux/rcupdate_wait.h>
-#include <linux/module.h>
 #include <linux/static_call.h>
 #include <linux/bpf_verifier.h>
 #include <linux/bpf_lsm.h>
@@ -172,26 +171,6 @@ out:
 	return tr;
 }
 
-static int bpf_trampoline_module_get(struct bpf_trampoline *tr)
-{
-	struct module *mod;
-	int err = 0;
-
-	preempt_disable();
-	mod = __module_text_address((unsigned long) tr->func.addr);
-	if (mod && !try_module_get(mod))
-		err = -ENOENT;
-	preempt_enable();
-	tr->mod = mod;
-	return err;
-}
-
-static void bpf_trampoline_module_put(struct bpf_trampoline *tr)
-{
-	module_put(tr->mod);
-	tr->mod = NULL;
-}
-
 static int unregister_fentry(struct bpf_trampoline *tr, void *old_addr)
 {
 	void *ip = tr->func.addr;
@@ -202,8 +181,6 @@ static int unregister_fentry(struct bpf_trampoline *tr, void *old_addr)
 	else
 		ret = bpf_arch_text_poke(ip, BPF_MOD_CALL, old_addr, NULL);
 
-	if (!ret)
-		bpf_trampoline_module_put(tr);
 	return ret;
 }
 
@@ -238,9 +215,6 @@ static int register_fentry(struct bpf_trampoline *tr, void *new_addr)
 		tr->func.ftrace_managed = true;
 	}
 
-	if (bpf_trampoline_module_get(tr))
-		return -ENOENT;
-
 	if (tr->func.ftrace_managed) {
 		ftrace_set_filter_ip(tr->fops, (unsigned long)ip, 0, 1);
 		ret = register_ftrace_direct_multi(tr->fops, (long)new_addr);
@@ -248,8 +222,6 @@ static int register_fentry(struct bpf_trampoline *tr, void *new_addr)
 		ret = bpf_arch_text_poke(ip, BPF_MOD_CALL, NULL, new_addr);
 	}
 
-	if (ret)
-		bpf_trampoline_module_put(tr);
 	return ret;
 }
 
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 2bbd89279070..60793f793ca6 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -24,6 +24,7 @@
 #include <linux/bpf_lsm.h>
 #include <linux/btf_ids.h>
 #include <linux/poison.h>
+#include "../module/internal.h"
 
 #include "disasm.h"
 
@@ -18307,6 +18308,7 @@ int bpf_check_attach_target(struct bpf_verifier_log *log,
 	const char *tname;
 	struct btf *btf;
 	long addr = 0;
+	struct module *mod = NULL;
 
 	if (!btf_id) {
 		bpf_log(log, "Tracing programs must provide btf_id\n");
@@ -18480,8 +18482,17 @@ int bpf_check_attach_target(struct bpf_verifier_log *log,
 			else
 				addr = (long) tgt_prog->aux->func[subprog]->bpf_func;
 		} else {
-			addr = kallsyms_lookup_name(tname);
+			if (btf_is_module(btf)) {
+				mod = btf_try_get_module(btf);
+				if (mod)
+					addr = find_kallsyms_symbol_value(mod, tname);
+				else
+					addr = 0;
+			} else {
+				addr = kallsyms_lookup_name(tname);
+			}
 			if (!addr) {
+				module_put(mod);
 				bpf_log(log,
 					"The address of function %s cannot be found\n",
 					tname);
@@ -18521,11 +18532,13 @@ int bpf_check_attach_target(struct bpf_verifier_log *log,
 				break;
 			}
 			if (ret) {
+				module_put(mod);
 				bpf_log(log, "%s is not sleepable\n", tname);
 				return ret;
 			}
 		} else if (prog->expected_attach_type == BPF_MODIFY_RETURN) {
 			if (tgt_prog) {
+				module_put(mod);
 				bpf_log(log, "can't modify return codes of BPF programs\n");
 				return -EINVAL;
 			}
@@ -18534,6 +18547,7 @@ int bpf_check_attach_target(struct bpf_verifier_log *log,
 			    !check_attach_modify_return(addr, tname))
 				ret = 0;
 			if (ret) {
+				module_put(mod);
 				bpf_log(log, "%s() is not modifiable\n", tname);
 				return ret;
 			}
@@ -18544,6 +18558,7 @@ int bpf_check_attach_target(struct bpf_verifier_log *log,
 	tgt_info->tgt_addr = addr;
 	tgt_info->tgt_name = tname;
 	tgt_info->tgt_type = t;
+	tgt_info->tgt_mod = mod;
 	return 0;
 }
 
@@ -18623,6 +18638,7 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
 	/* store info about the attachment target that will be used later */
 	prog->aux->attach_func_proto = tgt_info.tgt_type;
 	prog->aux->attach_func_name = tgt_info.tgt_name;
+	prog->aux->mod = tgt_info.tgt_mod;
 
 	if (tgt_prog) {
 		prog->aux->saved_dst_prog_type = tgt_prog->type;
diff --git a/kernel/module/internal.h b/kernel/module/internal.h
index 2e2bf236f558..5c9170f9135c 100644
--- a/kernel/module/internal.h
+++ b/kernel/module/internal.h
@@ -256,6 +256,11 @@ static inline bool sect_empty(const Elf_Shdr *sect)
 static inline void init_build_id(struct module *mod, const struct load_info *info) { }
 static inline void layout_symtab(struct module *mod, struct load_info *info) { }
 static inline void add_kallsyms(struct module *mod, const struct load_info *info) { }
+static inline unsigned long find_kallsyms_symbol_value(struct module *mod,
+						       const char *name)
+{
+	return 0;
+}
 #endif /* CONFIG_KALLSYMS */
 
 #ifdef CONFIG_SYSFS