* [PATCH net v2] bpf: Fix memory leaks in __check_func_call
@ 2022-10-28 5:22 Wang Yufen
2022-11-02 19:05 ` Andrii Nakryiko
0 siblings, 1 reply; 5+ messages in thread
From: Wang Yufen @ 2022-10-28 5:22 UTC (permalink / raw)
To: bpf, netdev; +Cc: ast, daniel, john.fastabend, andrii, martin.lau, yhs, joe
kmemleak reports this issue:
unreferenced object 0xffff88817139d000 (size 2048):
comm "test_progs", pid 33246, jiffies 4307381979 (age 45851.820s)
hex dump (first 32 bytes):
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<0000000045f075f0>] kmalloc_trace+0x27/0xa0
[<0000000098b7c90a>] __check_func_call+0x316/0x1230
[<00000000b4c3c403>] check_helper_call+0x172e/0x4700
[<00000000aa3875b7>] do_check+0x21d8/0x45e0
[<000000001147357b>] do_check_common+0x767/0xaf0
[<00000000b5a595b4>] bpf_check+0x43e3/0x5bc0
[<0000000011e391b1>] bpf_prog_load+0xf26/0x1940
[<0000000007f765c0>] __sys_bpf+0xd2c/0x3650
[<00000000839815d6>] __x64_sys_bpf+0x75/0xc0
[<00000000946ee250>] do_syscall_64+0x3b/0x90
[<0000000000506b7f>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
The root case here is: In function prepare_func_exit(), the callee is
not released in the abnormal scenario after "state->curframe--;". To
fix, move "state->curframe--;" to the very bottom of the function,
right when we free callee and reset frame[] pointer to NULL, as Andrii
suggested.
In addition, function __check_func_call() has a similar problem. In
the abnormal scenario before "state->curframe++;", the callee is alse
not released.
Fixes: 69c087ba6225 ("bpf: Add bpf_for_each_map_elem() helper")
Fixes: fd978bf7fd31 ("bpf: Add reference tracking to verifier")
Signed-off-by: Wang Yufen <wangyufen@huawei.com>
---
kernel/bpf/verifier.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 014ee09..d28d460 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -6736,11 +6736,11 @@ static int __check_func_call(struct bpf_verifier_env *env, struct bpf_insn *insn
/* Transfer references to the callee */
err = copy_reference_state(callee, caller);
if (err)
- return err;
+ goto err_out;
err = set_callee_state_cb(env, caller, callee, *insn_idx);
if (err)
- return err;
+ goto err_out;
clear_caller_saved_regs(env, caller->regs);
@@ -6757,6 +6757,11 @@ static int __check_func_call(struct bpf_verifier_env *env, struct bpf_insn *insn
print_verifier_state(env, callee, true);
}
return 0;
+
+err_out:
+ kfree(callee);
+ state->frame[state->curframe + 1] = NULL;
+ return err;
}
int map_set_for_each_callback_args(struct bpf_verifier_env *env,
@@ -6969,7 +6974,6 @@ static int prepare_func_exit(struct bpf_verifier_env *env, int *insn_idx)
return -EINVAL;
}
- state->curframe--;
caller = state->frame[state->curframe];
if (callee->in_callback_fn) {
/* enforce R0 return value range [0, 1]. */
@@ -7000,6 +7004,7 @@ static int prepare_func_exit(struct bpf_verifier_env *env, int *insn_idx)
return err;
}
+ state->curframe--;
*insn_idx = callee->callsite + 1;
if (env->log.level & BPF_LOG_LEVEL) {
verbose(env, "returning from callee:\n");
--
1.8.3.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH net v2] bpf: Fix memory leaks in __check_func_call
2022-10-28 5:22 [PATCH net v2] bpf: Fix memory leaks in __check_func_call Wang Yufen
@ 2022-11-02 19:05 ` Andrii Nakryiko
2022-11-02 19:06 ` Andrii Nakryiko
2022-11-03 1:13 ` wangyufen
0 siblings, 2 replies; 5+ messages in thread
From: Andrii Nakryiko @ 2022-11-02 19:05 UTC (permalink / raw)
To: Wang Yufen
Cc: bpf, netdev, ast, daniel, john.fastabend, andrii, martin.lau, yhs, joe
On Thu, Oct 27, 2022 at 10:01 PM Wang Yufen <wangyufen@huawei.com> wrote:
>
> kmemleak reports this issue:
>
> unreferenced object 0xffff88817139d000 (size 2048):
> comm "test_progs", pid 33246, jiffies 4307381979 (age 45851.820s)
> hex dump (first 32 bytes):
> 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<0000000045f075f0>] kmalloc_trace+0x27/0xa0
> [<0000000098b7c90a>] __check_func_call+0x316/0x1230
> [<00000000b4c3c403>] check_helper_call+0x172e/0x4700
> [<00000000aa3875b7>] do_check+0x21d8/0x45e0
> [<000000001147357b>] do_check_common+0x767/0xaf0
> [<00000000b5a595b4>] bpf_check+0x43e3/0x5bc0
> [<0000000011e391b1>] bpf_prog_load+0xf26/0x1940
> [<0000000007f765c0>] __sys_bpf+0xd2c/0x3650
> [<00000000839815d6>] __x64_sys_bpf+0x75/0xc0
> [<00000000946ee250>] do_syscall_64+0x3b/0x90
> [<0000000000506b7f>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> The root case here is: In function prepare_func_exit(), the callee is
> not released in the abnormal scenario after "state->curframe--;". To
> fix, move "state->curframe--;" to the very bottom of the function,
> right when we free callee and reset frame[] pointer to NULL, as Andrii
> suggested.
>
> In addition, function __check_func_call() has a similar problem. In
> the abnormal scenario before "state->curframe++;", the callee is alse
> not released.
>
> Fixes: 69c087ba6225 ("bpf: Add bpf_for_each_map_elem() helper")
> Fixes: fd978bf7fd31 ("bpf: Add reference tracking to verifier")
> Signed-off-by: Wang Yufen <wangyufen@huawei.com>
> ---
This change seems to be breaking BPF selftests quite badly, please
check what's going on ([0]):
[0] https://github.com/kernel-patches/bpf/actions/runs/3379444311/jobs/5611599540
> kernel/bpf/verifier.c | 11 ++++++++---
> 1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
> index 014ee09..d28d460 100644
> --- a/kernel/bpf/verifier.c
> +++ b/kernel/bpf/verifier.c
> @@ -6736,11 +6736,11 @@ static int __check_func_call(struct bpf_verifier_env *env, struct bpf_insn *insn
> /* Transfer references to the callee */
> err = copy_reference_state(callee, caller);
> if (err)
> - return err;
> + goto err_out;
>
> err = set_callee_state_cb(env, caller, callee, *insn_idx);
> if (err)
> - return err;
> + goto err_out;
>
> clear_caller_saved_regs(env, caller->regs);
>
> @@ -6757,6 +6757,11 @@ static int __check_func_call(struct bpf_verifier_env *env, struct bpf_insn *insn
> print_verifier_state(env, callee, true);
> }
> return 0;
> +
> +err_out:
> + kfree(callee);
> + state->frame[state->curframe + 1] = NULL;
> + return err;
> }
>
> int map_set_for_each_callback_args(struct bpf_verifier_env *env,
> @@ -6969,7 +6974,6 @@ static int prepare_func_exit(struct bpf_verifier_env *env, int *insn_idx)
> return -EINVAL;
> }
>
> - state->curframe--;
> caller = state->frame[state->curframe];
> if (callee->in_callback_fn) {
> /* enforce R0 return value range [0, 1]. */
> @@ -7000,6 +7004,7 @@ static int prepare_func_exit(struct bpf_verifier_env *env, int *insn_idx)
> return err;
> }
>
> + state->curframe--;
> *insn_idx = callee->callsite + 1;
> if (env->log.level & BPF_LOG_LEVEL) {
> verbose(env, "returning from callee:\n");
> --
> 1.8.3.1
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH net v2] bpf: Fix memory leaks in __check_func_call
2022-11-02 19:05 ` Andrii Nakryiko
@ 2022-11-02 19:06 ` Andrii Nakryiko
2022-11-03 1:15 ` wangyufen
2022-11-03 1:13 ` wangyufen
1 sibling, 1 reply; 5+ messages in thread
From: Andrii Nakryiko @ 2022-11-02 19:06 UTC (permalink / raw)
To: Wang Yufen
Cc: bpf, netdev, ast, daniel, john.fastabend, andrii, martin.lau, yhs, joe
On Wed, Nov 2, 2022 at 12:05 PM Andrii Nakryiko
<andrii.nakryiko@gmail.com> wrote:
>
> On Thu, Oct 27, 2022 at 10:01 PM Wang Yufen <wangyufen@huawei.com> wrote:
> >
> > kmemleak reports this issue:
> >
> > unreferenced object 0xffff88817139d000 (size 2048):
> > comm "test_progs", pid 33246, jiffies 4307381979 (age 45851.820s)
> > hex dump (first 32 bytes):
> > 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> > backtrace:
> > [<0000000045f075f0>] kmalloc_trace+0x27/0xa0
> > [<0000000098b7c90a>] __check_func_call+0x316/0x1230
> > [<00000000b4c3c403>] check_helper_call+0x172e/0x4700
> > [<00000000aa3875b7>] do_check+0x21d8/0x45e0
> > [<000000001147357b>] do_check_common+0x767/0xaf0
> > [<00000000b5a595b4>] bpf_check+0x43e3/0x5bc0
> > [<0000000011e391b1>] bpf_prog_load+0xf26/0x1940
> > [<0000000007f765c0>] __sys_bpf+0xd2c/0x3650
> > [<00000000839815d6>] __x64_sys_bpf+0x75/0xc0
> > [<00000000946ee250>] do_syscall_64+0x3b/0x90
> > [<0000000000506b7f>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
> >
> > The root case here is: In function prepare_func_exit(), the callee is
> > not released in the abnormal scenario after "state->curframe--;". To
> > fix, move "state->curframe--;" to the very bottom of the function,
> > right when we free callee and reset frame[] pointer to NULL, as Andrii
> > suggested.
> >
> > In addition, function __check_func_call() has a similar problem. In
> > the abnormal scenario before "state->curframe++;", the callee is alse
> > not released.
> >
> > Fixes: 69c087ba6225 ("bpf: Add bpf_for_each_map_elem() helper")
> > Fixes: fd978bf7fd31 ("bpf: Add reference tracking to verifier")
> > Signed-off-by: Wang Yufen <wangyufen@huawei.com>
> > ---
>
> This change seems to be breaking BPF selftests quite badly, please
> check what's going on ([0]):
>
> [0] https://github.com/kernel-patches/bpf/actions/runs/3379444311/jobs/5611599540
>
And also please target it against bpf tree: [PATCH bpf], not net tree.
> > kernel/bpf/verifier.c | 11 ++++++++---
> > 1 file changed, 8 insertions(+), 3 deletions(-)
> >
> > diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
> > index 014ee09..d28d460 100644
> > --- a/kernel/bpf/verifier.c
> > +++ b/kernel/bpf/verifier.c
> > @@ -6736,11 +6736,11 @@ static int __check_func_call(struct bpf_verifier_env *env, struct bpf_insn *insn
> > /* Transfer references to the callee */
> > err = copy_reference_state(callee, caller);
> > if (err)
> > - return err;
> > + goto err_out;
> >
> > err = set_callee_state_cb(env, caller, callee, *insn_idx);
> > if (err)
> > - return err;
> > + goto err_out;
> >
> > clear_caller_saved_regs(env, caller->regs);
> >
> > @@ -6757,6 +6757,11 @@ static int __check_func_call(struct bpf_verifier_env *env, struct bpf_insn *insn
> > print_verifier_state(env, callee, true);
> > }
> > return 0;
> > +
> > +err_out:
> > + kfree(callee);
> > + state->frame[state->curframe + 1] = NULL;
> > + return err;
> > }
> >
> > int map_set_for_each_callback_args(struct bpf_verifier_env *env,
> > @@ -6969,7 +6974,6 @@ static int prepare_func_exit(struct bpf_verifier_env *env, int *insn_idx)
> > return -EINVAL;
> > }
> >
> > - state->curframe--;
> > caller = state->frame[state->curframe];
> > if (callee->in_callback_fn) {
> > /* enforce R0 return value range [0, 1]. */
> > @@ -7000,6 +7004,7 @@ static int prepare_func_exit(struct bpf_verifier_env *env, int *insn_idx)
> > return err;
> > }
> >
> > + state->curframe--;
> > *insn_idx = callee->callsite + 1;
> > if (env->log.level & BPF_LOG_LEVEL) {
> > verbose(env, "returning from callee:\n");
> > --
> > 1.8.3.1
> >
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH net v2] bpf: Fix memory leaks in __check_func_call
2022-11-02 19:05 ` Andrii Nakryiko
2022-11-02 19:06 ` Andrii Nakryiko
@ 2022-11-03 1:13 ` wangyufen
1 sibling, 0 replies; 5+ messages in thread
From: wangyufen @ 2022-11-03 1:13 UTC (permalink / raw)
To: Andrii Nakryiko
Cc: bpf, netdev, ast, daniel, john.fastabend, andrii, martin.lau, yhs, joe
在 2022/11/3 3:05, Andrii Nakryiko 写道:
> On Thu, Oct 27, 2022 at 10:01 PM Wang Yufen <wangyufen@huawei.com> wrote:
>> kmemleak reports this issue:
>>
>> unreferenced object 0xffff88817139d000 (size 2048):
>> comm "test_progs", pid 33246, jiffies 4307381979 (age 45851.820s)
>> hex dump (first 32 bytes):
>> 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
>> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
>> backtrace:
>> [<0000000045f075f0>] kmalloc_trace+0x27/0xa0
>> [<0000000098b7c90a>] __check_func_call+0x316/0x1230
>> [<00000000b4c3c403>] check_helper_call+0x172e/0x4700
>> [<00000000aa3875b7>] do_check+0x21d8/0x45e0
>> [<000000001147357b>] do_check_common+0x767/0xaf0
>> [<00000000b5a595b4>] bpf_check+0x43e3/0x5bc0
>> [<0000000011e391b1>] bpf_prog_load+0xf26/0x1940
>> [<0000000007f765c0>] __sys_bpf+0xd2c/0x3650
>> [<00000000839815d6>] __x64_sys_bpf+0x75/0xc0
>> [<00000000946ee250>] do_syscall_64+0x3b/0x90
>> [<0000000000506b7f>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>>
>> The root case here is: In function prepare_func_exit(), the callee is
>> not released in the abnormal scenario after "state->curframe--;". To
>> fix, move "state->curframe--;" to the very bottom of the function,
>> right when we free callee and reset frame[] pointer to NULL, as Andrii
>> suggested.
>>
>> In addition, function __check_func_call() has a similar problem. In
>> the abnormal scenario before "state->curframe++;", the callee is alse
>> not released.
>>
>> Fixes: 69c087ba6225 ("bpf: Add bpf_for_each_map_elem() helper")
>> Fixes: fd978bf7fd31 ("bpf: Add reference tracking to verifier")
>> Signed-off-by: Wang Yufen <wangyufen@huawei.com>
>> ---
> This change seems to be breaking BPF selftests quite badly, please
> check what's going on ([0]):
>
> [0] https://github.com/kernel-patches/bpf/actions/runs/3379444311/jobs/5611599540
>
>> kernel/bpf/verifier.c | 11 ++++++++---
>> 1 file changed, 8 insertions(+), 3 deletions(-)
>>
>> diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
>> index 014ee09..d28d460 100644
>> --- a/kernel/bpf/verifier.c
>> +++ b/kernel/bpf/verifier.c
>> @@ -6736,11 +6736,11 @@ static int __check_func_call(struct bpf_verifier_env *env, struct bpf_insn *insn
>> /* Transfer references to the callee */
>> err = copy_reference_state(callee, caller);
>> if (err)
>> - return err;
>> + goto err_out;
>>
>> err = set_callee_state_cb(env, caller, callee, *insn_idx);
>> if (err)
>> - return err;
>> + goto err_out;
>>
>> clear_caller_saved_regs(env, caller->regs);
>>
>> @@ -6757,6 +6757,11 @@ static int __check_func_call(struct bpf_verifier_env *env, struct bpf_insn *insn
>> print_verifier_state(env, callee, true);
>> }
>> return 0;
>> +
>> +err_out:
>> + kfree(callee);
>> + state->frame[state->curframe + 1] = NULL;
>> + return err;
>> }
>>
>> int map_set_for_each_callback_args(struct bpf_verifier_env *env,
>> @@ -6969,7 +6974,6 @@ static int prepare_func_exit(struct bpf_verifier_env *env, int *insn_idx)
>> return -EINVAL;
>> }
>>
>> - state->curframe--;
>> caller = state->frame[state->curframe];
Got the wrong “caller” here, will change to
state->frame[state->curframe - 1] in v3
>> if (callee->in_callback_fn) {
>> /* enforce R0 return value range [0, 1]. */
>> @@ -7000,6 +7004,7 @@ static int prepare_func_exit(struct bpf_verifier_env *env, int *insn_idx)
>> return err;
>> }
>>
>> + state->curframe--;
>> *insn_idx = callee->callsite + 1;
>> if (env->log.level & BPF_LOG_LEVEL) {
>> verbose(env, "returning from callee:\n");
>> --
>> 1.8.3.1
>>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH net v2] bpf: Fix memory leaks in __check_func_call
2022-11-02 19:06 ` Andrii Nakryiko
@ 2022-11-03 1:15 ` wangyufen
0 siblings, 0 replies; 5+ messages in thread
From: wangyufen @ 2022-11-03 1:15 UTC (permalink / raw)
To: Andrii Nakryiko
Cc: bpf, netdev, ast, daniel, john.fastabend, andrii, martin.lau, yhs, joe
在 2022/11/3 3:06, Andrii Nakryiko 写道:
> On Wed, Nov 2, 2022 at 12:05 PM Andrii Nakryiko
> <andrii.nakryiko@gmail.com> wrote:
>> On Thu, Oct 27, 2022 at 10:01 PM Wang Yufen <wangyufen@huawei.com> wrote:
>>> kmemleak reports this issue:
>>>
>>> unreferenced object 0xffff88817139d000 (size 2048):
>>> comm "test_progs", pid 33246, jiffies 4307381979 (age 45851.820s)
>>> hex dump (first 32 bytes):
>>> 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
>>> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
>>> backtrace:
>>> [<0000000045f075f0>] kmalloc_trace+0x27/0xa0
>>> [<0000000098b7c90a>] __check_func_call+0x316/0x1230
>>> [<00000000b4c3c403>] check_helper_call+0x172e/0x4700
>>> [<00000000aa3875b7>] do_check+0x21d8/0x45e0
>>> [<000000001147357b>] do_check_common+0x767/0xaf0
>>> [<00000000b5a595b4>] bpf_check+0x43e3/0x5bc0
>>> [<0000000011e391b1>] bpf_prog_load+0xf26/0x1940
>>> [<0000000007f765c0>] __sys_bpf+0xd2c/0x3650
>>> [<00000000839815d6>] __x64_sys_bpf+0x75/0xc0
>>> [<00000000946ee250>] do_syscall_64+0x3b/0x90
>>> [<0000000000506b7f>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>>>
>>> The root case here is: In function prepare_func_exit(), the callee is
>>> not released in the abnormal scenario after "state->curframe--;". To
>>> fix, move "state->curframe--;" to the very bottom of the function,
>>> right when we free callee and reset frame[] pointer to NULL, as Andrii
>>> suggested.
>>>
>>> In addition, function __check_func_call() has a similar problem. In
>>> the abnormal scenario before "state->curframe++;", the callee is alse
>>> not released.
>>>
>>> Fixes: 69c087ba6225 ("bpf: Add bpf_for_each_map_elem() helper")
>>> Fixes: fd978bf7fd31 ("bpf: Add reference tracking to verifier")
>>> Signed-off-by: Wang Yufen <wangyufen@huawei.com>
>>> ---
>> This change seems to be breaking BPF selftests quite badly, please
>> check what's going on ([0]):
>>
>> [0] https://github.com/kernel-patches/bpf/actions/runs/3379444311/jobs/5611599540
>>
> And also please target it against bpf tree: [PATCH bpf], not net tree.
OK， thanks！
>
>>> kernel/bpf/verifier.c | 11 ++++++++---
>>> 1 file changed, 8 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
>>> index 014ee09..d28d460 100644
>>> --- a/kernel/bpf/verifier.c
>>> +++ b/kernel/bpf/verifier.c
>>> @@ -6736,11 +6736,11 @@ static int __check_func_call(struct bpf_verifier_env *env, struct bpf_insn *insn
>>> /* Transfer references to the callee */
>>> err = copy_reference_state(callee, caller);
>>> if (err)
>>> - return err;
>>> + goto err_out;
>>>
>>> err = set_callee_state_cb(env, caller, callee, *insn_idx);
>>> if (err)
>>> - return err;
>>> + goto err_out;
>>>
>>> clear_caller_saved_regs(env, caller->regs);
>>>
>>> @@ -6757,6 +6757,11 @@ static int __check_func_call(struct bpf_verifier_env *env, struct bpf_insn *insn
>>> print_verifier_state(env, callee, true);
>>> }
>>> return 0;
>>> +
>>> +err_out:
>>> + kfree(callee);
>>> + state->frame[state->curframe + 1] = NULL;
>>> + return err;
>>> }
>>>
>>> int map_set_for_each_callback_args(struct bpf_verifier_env *env,
>>> @@ -6969,7 +6974,6 @@ static int prepare_func_exit(struct bpf_verifier_env *env, int *insn_idx)
>>> return -EINVAL;
>>> }
>>>
>>> - state->curframe--;
>>> caller = state->frame[state->curframe];
>>> if (callee->in_callback_fn) {
>>> /* enforce R0 return value range [0, 1]. */
>>> @@ -7000,6 +7004,7 @@ static int prepare_func_exit(struct bpf_verifier_env *env, int *insn_idx)
>>> return err;
>>> }
>>>
>>> + state->curframe--;
>>> *insn_idx = callee->callsite + 1;
>>> if (env->log.level & BPF_LOG_LEVEL) {
>>> verbose(env, "returning from callee:\n");
>>> --
>>> 1.8.3.1
>>>
^ permalink raw reply [flat|nested] 5+ messages in thread
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2022-10-28 5:22 [PATCH net v2] bpf: Fix memory leaks in __check_func_call Wang Yufen
2022-11-02 19:05 ` Andrii Nakryiko
2022-11-02 19:06 ` Andrii Nakryiko
2022-11-03 1:15 ` wangyufen
2022-11-03 1:13 ` wangyufen
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