2022-05-26 07:01:15

by Guo Ren

Subject: [PATCH] riscv: compat: Using seperated vdso_maps for compat_vdso_info

From: Guo Ren <[email protected]>

This is a fixup for vdso implementation which caused musl to
fail.

[ 11.600082] Run /sbin/init as init process
[ 11.628561] init[1]: unhandled signal 11 code 0x1 at
0x0000000000000000 in libc.so[ffffff8ad39000+a4000]
[ 11.629398] CPU: 0 PID: 1 Comm: init Not tainted
5.18.0-rc7-next-20220520 #1
[ 11.629462] Hardware name: riscv-virtio,qemu (DT)
[ 11.629546] epc : 00ffffff8ada1100 ra : 00ffffff8ada13c8 sp :
00ffffffc58199f0
[ 11.629586] gp : 00ffffff8ad39000 tp : 00ffffff8ade0998 t0 :
ffffffffffffffff
[ 11.629598] t1 : 00ffffffc5819fd0 t2 : 0000000000000000 s0 :
00ffffff8ade0cc0
[ 11.629610] s1 : 00ffffff8ade0cc0 a0 : 0000000000000000 a1 :
00ffffffc5819a00
[ 11.629622] a2 : 0000000000000001 a3 : 000000000000001e a4 :
00ffffffc5819b00
[ 11.629634] a5 : 00ffffffc5819b00 a6 : 0000000000000000 a7 :
0000000000000000
[ 11.629645] s2 : 00ffffff8ade0ac8 s3 : 00ffffff8ade0ec8 s4 :
00ffffff8ade0728
[ 11.629656] s5 : 00ffffff8ade0a90 s6 : 0000000000000000 s7 :
00ffffffc5819e40
[ 11.629667] s8 : 00ffffff8ade0ca0 s9 : 00ffffff8addba50 s10:
0000000000000000
[ 11.629678] s11: 0000000000000000 t3 : 0000000000000002 t4 :
0000000000000001
[ 11.629688] t5 : 0000000000020000 t6 : ffffffffffffffff
[ 11.629699] status: 0000000000004020 badaddr: 0000000000000000
cause: 000000000000000d

The last __vdso_init(&compat_vdso_info) replaces the data in normal
vdso_info. This is an obvious bug.

Reported-by: Guenter Roeck <[email protected]>
Signed-off-by: Guo Ren <[email protected]>
Signed-off-by: Guo Ren <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Heiko Stübner <[email protected]>
---
arch/riscv/kernel/vdso.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c
index 50fe4c877603..69b05b6c181b 100644
--- a/arch/riscv/kernel/vdso.c
+++ b/arch/riscv/kernel/vdso.c
@@ -206,12 +206,23 @@ static struct __vdso_info vdso_info __ro_after_init = {
};

#ifdef CONFIG_COMPAT
+static struct vm_special_mapping rv_compat_vdso_maps[] __ro_after_init = {
+ [RV_VDSO_MAP_VVAR] = {
+ .name = "[vvar]",
+ .fault = vvar_fault,
+ },
+ [RV_VDSO_MAP_VDSO] = {
+ .name = "[vdso]",
+ .mremap = vdso_mremap,
+ },
+};
+
static struct __vdso_info compat_vdso_info __ro_after_init = {
.name = "compat_vdso",
.vdso_code_start = compat_vdso_start,
.vdso_code_end = compat_vdso_end,
- .dm = &rv_vdso_maps[RV_VDSO_MAP_VVAR],
- .cm = &rv_vdso_maps[RV_VDSO_MAP_VDSO],
+ .dm = &rv_compat_vdso_maps[RV_VDSO_MAP_VVAR],
+ .cm = &rv_compat_vdso_maps[RV_VDSO_MAP_VDSO],
};
#endif

--
2.36.1

2022-05-26 18:18:35

by Palmer Dabbelt

Subject: Re: [PATCH] riscv: compat: Using seperated vdso_maps for compat_vdso_info

On Wed, 25 May 2022 17:39:39 PDT (-0700), Palmer Dabbelt wrote:
> On Wed, 25 May 2022 15:56:07 PDT (-0700), [email protected] wrote:
>> On 5/25/22 14:34, Palmer Dabbelt wrote:
>>> On Wed, 25 May 2022 14:15:03 PDT (-0700), [email protected] wrote:
>>>> On 5/25/22 09:04, [email protected] wrote:
>>>>> From: Guo Ren <[email protected]>
>>>>>
>>>>> This is a fixup for vdso implementation which caused musl to
>>>>> fail.
>>>>>
>>>>> [   11.600082] Run /sbin/init as init process
>>>>> [   11.628561] init[1]: unhandled signal 11 code 0x1 at
>>>>> 0x0000000000000000 in libc.so[ffffff8ad39000+a4000]
>>>>> [   11.629398] CPU: 0 PID: 1 Comm: init Not tainted
>>>>> 5.18.0-rc7-next-20220520 #1
>>>>> [   11.629462] Hardware name: riscv-virtio,qemu (DT)
>>>>> [   11.629546] epc : 00ffffff8ada1100 ra : 00ffffff8ada13c8 sp :
>>>>> 00ffffffc58199f0
>>>>> [   11.629586]  gp : 00ffffff8ad39000 tp : 00ffffff8ade0998 t0 :
>>>>> ffffffffffffffff
>>>>> [   11.629598]  t1 : 00ffffffc5819fd0 t2 : 0000000000000000 s0 :
>>>>> 00ffffff8ade0cc0
>>>>> [   11.629610]  s1 : 00ffffff8ade0cc0 a0 : 0000000000000000 a1 :
>>>>> 00ffffffc5819a00
>>>>> [   11.629622]  a2 : 0000000000000001 a3 : 000000000000001e a4 :
>>>>> 00ffffffc5819b00
>>>>> [   11.629634]  a5 : 00ffffffc5819b00 a6 : 0000000000000000 a7 :
>>>>> 0000000000000000
>>>>> [   11.629645]  s2 : 00ffffff8ade0ac8 s3 : 00ffffff8ade0ec8 s4 :
>>>>> 00ffffff8ade0728
>>>>> [   11.629656]  s5 : 00ffffff8ade0a90 s6 : 0000000000000000 s7 :
>>>>> 00ffffffc5819e40
>>>>> [   11.629667]  s8 : 00ffffff8ade0ca0 s9 : 00ffffff8addba50 s10:
>>>>> 0000000000000000
>>>>> [   11.629678]  s11: 0000000000000000 t3 : 0000000000000002 t4 :
>>>>> 0000000000000001
>>>>> [   11.629688]  t5 : 0000000000020000 t6 : ffffffffffffffff
>>>>> [   11.629699] status: 0000000000004020 badaddr: 0000000000000000
>>>>> cause: 000000000000000d
>>>>>
>>>>> The last __vdso_init(&compat_vdso_info) replaces the data in normal
>>>>> vdso_info. This is an obvious bug.
>>>>>
>>>>> Reported-by: Guenter Roeck <[email protected]>
>>>>> Signed-off-by: Guo Ren <[email protected]>
>>>>> Signed-off-by: Guo Ren <[email protected]>
>>>>> Cc: Palmer Dabbelt <[email protected]>
>>>>> Cc: Heiko Stübner <[email protected]>
>>>>
>>>> Tested-by: Guenter Roeck <[email protected]>
>>>
>>> Sorry I'm a bit buried right now, this is fixing the issue you pointed out earlier?
>>>
>> Yes.
>
> Awosome, I think that was the only big blocker so far.
>
> I added a musl-based userspace to my test setup, which is rv64-only
> (buildroot doesn't have rv32 musl, I thought upstream had it but maybe
> i'm misremembering). This patch fixes the bug, so I've added it to
> for-next with

Just saw the v2, so I'm using that instead.

>
> Fixes: 3092eb456375 ("riscv: compat: vdso: Add setup additional pages implementation")
>
> which I think is correct, but LMK if there's an issue.
>
> Thanks!
>
> (and also sorry I poked Geert instead of you about this one, oops ;))
>
>>
>> Thanks,
>> Guenter
>>
>>>>
>>>>> ---
>>>>>   arch/riscv/kernel/vdso.c | 15 +++++++++++++--
>>>>>   1 file changed, 13 insertions(+), 2 deletions(-)
>>>>>
>>>>> diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c
>>>>> index 50fe4c877603..69b05b6c181b 100644
>>>>> --- a/arch/riscv/kernel/vdso.c
>>>>> +++ b/arch/riscv/kernel/vdso.c
>>>>> @@ -206,12 +206,23 @@ static struct __vdso_info vdso_info __ro_after_init = {
>>>>>   };
>>>>>
>>>>>   #ifdef CONFIG_COMPAT
>>>>> +static struct vm_special_mapping rv_compat_vdso_maps[] __ro_after_init = {
>>>>> +    [RV_VDSO_MAP_VVAR] = {
>>>>> +        .name   = "[vvar]",
>>>>> +        .fault = vvar_fault,
>>>>> +    },
>>>>> +    [RV_VDSO_MAP_VDSO] = {
>>>>> +        .name   = "[vdso]",
>>>>> +        .mremap = vdso_mremap,
>>>>> +    },
>>>>> +};
>>>>> +
>>>>>   static struct __vdso_info compat_vdso_info __ro_after_init = {
>>>>>       .name = "compat_vdso",
>>>>>       .vdso_code_start = compat_vdso_start,
>>>>>       .vdso_code_end = compat_vdso_end,
>>>>> -    .dm = &rv_vdso_maps[RV_VDSO_MAP_VVAR],
>>>>> -    .cm = &rv_vdso_maps[RV_VDSO_MAP_VDSO],
>>>>> +    .dm = &rv_compat_vdso_maps[RV_VDSO_MAP_VVAR],
>>>>> +    .cm = &rv_compat_vdso_maps[RV_VDSO_MAP_VDSO],
>>>>>   };
>>>>>   #endif
>>>>>

2022-05-26 22:55:25

by Palmer Dabbelt

Subject: Re: [PATCH] riscv: compat: Using seperated vdso_maps for compat_vdso_info

On Wed, 25 May 2022 15:56:07 PDT (-0700), [email protected] wrote:
> On 5/25/22 14:34, Palmer Dabbelt wrote:
>> On Wed, 25 May 2022 14:15:03 PDT (-0700), [email protected] wrote:
>>> On 5/25/22 09:04, [email protected] wrote:
>>>> From: Guo Ren <[email protected]>
>>>>
>>>> This is a fixup for vdso implementation which caused musl to
>>>> fail.
>>>>
>>>> [   11.600082] Run /sbin/init as init process
>>>> [   11.628561] init[1]: unhandled signal 11 code 0x1 at
>>>> 0x0000000000000000 in libc.so[ffffff8ad39000+a4000]
>>>> [   11.629398] CPU: 0 PID: 1 Comm: init Not tainted
>>>> 5.18.0-rc7-next-20220520 #1
>>>> [   11.629462] Hardware name: riscv-virtio,qemu (DT)
>>>> [   11.629546] epc : 00ffffff8ada1100 ra : 00ffffff8ada13c8 sp :
>>>> 00ffffffc58199f0
>>>> [   11.629586]  gp : 00ffffff8ad39000 tp : 00ffffff8ade0998 t0 :
>>>> ffffffffffffffff
>>>> [   11.629598]  t1 : 00ffffffc5819fd0 t2 : 0000000000000000 s0 :
>>>> 00ffffff8ade0cc0
>>>> [   11.629610]  s1 : 00ffffff8ade0cc0 a0 : 0000000000000000 a1 :
>>>> 00ffffffc5819a00
>>>> [   11.629622]  a2 : 0000000000000001 a3 : 000000000000001e a4 :
>>>> 00ffffffc5819b00
>>>> [   11.629634]  a5 : 00ffffffc5819b00 a6 : 0000000000000000 a7 :
>>>> 0000000000000000
>>>> [   11.629645]  s2 : 00ffffff8ade0ac8 s3 : 00ffffff8ade0ec8 s4 :
>>>> 00ffffff8ade0728
>>>> [   11.629656]  s5 : 00ffffff8ade0a90 s6 : 0000000000000000 s7 :
>>>> 00ffffffc5819e40
>>>> [   11.629667]  s8 : 00ffffff8ade0ca0 s9 : 00ffffff8addba50 s10:
>>>> 0000000000000000
>>>> [   11.629678]  s11: 0000000000000000 t3 : 0000000000000002 t4 :
>>>> 0000000000000001
>>>> [   11.629688]  t5 : 0000000000020000 t6 : ffffffffffffffff
>>>> [   11.629699] status: 0000000000004020 badaddr: 0000000000000000
>>>> cause: 000000000000000d
>>>>
>>>> The last __vdso_init(&compat_vdso_info) replaces the data in normal
>>>> vdso_info. This is an obvious bug.
>>>>
>>>> Reported-by: Guenter Roeck <[email protected]>
>>>> Signed-off-by: Guo Ren <[email protected]>
>>>> Signed-off-by: Guo Ren <[email protected]>
>>>> Cc: Palmer Dabbelt <[email protected]>
>>>> Cc: Heiko Stübner <[email protected]>
>>>
>>> Tested-by: Guenter Roeck <[email protected]>
>>
>> Sorry I'm a bit buried right now, this is fixing the issue you pointed out earlier?
>>
> Yes.

Awosome, I think that was the only big blocker so far.

I added a musl-based userspace to my test setup, which is rv64-only
(buildroot doesn't have rv32 musl, I thought upstream had it but maybe
i'm misremembering). This patch fixes the bug, so I've added it to
for-next with

Fixes: 3092eb456375 ("riscv: compat: vdso: Add setup additional pages implementation")

which I think is correct, but LMK if there's an issue.

Thanks!

(and also sorry I poked Geert instead of you about this one, oops ;))

>
> Thanks,
> Guenter
>
>>>
>>>> ---
>>>>   arch/riscv/kernel/vdso.c | 15 +++++++++++++--
>>>>   1 file changed, 13 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c
>>>> index 50fe4c877603..69b05b6c181b 100644
>>>> --- a/arch/riscv/kernel/vdso.c
>>>> +++ b/arch/riscv/kernel/vdso.c
>>>> @@ -206,12 +206,23 @@ static struct __vdso_info vdso_info __ro_after_init = {
>>>>   };
>>>>
>>>>   #ifdef CONFIG_COMPAT
>>>> +static struct vm_special_mapping rv_compat_vdso_maps[] __ro_after_init = {
>>>> +    [RV_VDSO_MAP_VVAR] = {
>>>> +        .name   = "[vvar]",
>>>> +        .fault = vvar_fault,
>>>> +    },
>>>> +    [RV_VDSO_MAP_VDSO] = {
>>>> +        .name   = "[vdso]",
>>>> +        .mremap = vdso_mremap,
>>>> +    },
>>>> +};
>>>> +
>>>>   static struct __vdso_info compat_vdso_info __ro_after_init = {
>>>>       .name = "compat_vdso",
>>>>       .vdso_code_start = compat_vdso_start,
>>>>       .vdso_code_end = compat_vdso_end,
>>>> -    .dm = &rv_vdso_maps[RV_VDSO_MAP_VVAR],
>>>> -    .cm = &rv_vdso_maps[RV_VDSO_MAP_VDSO],
>>>> +    .dm = &rv_compat_vdso_maps[RV_VDSO_MAP_VVAR],
>>>> +    .cm = &rv_compat_vdso_maps[RV_VDSO_MAP_VDSO],
>>>>   };
>>>>   #endif
>>>>

2022-05-27 12:08:06

by Guo Ren

Subject: Re: [PATCH] riscv: compat: Using seperated vdso_maps for compat_vdso_info

On Thu, May 26, 2022 at 8:43 AM Palmer Dabbelt <[email protected]> wrote:
>
> On Wed, 25 May 2022 17:39:39 PDT (-0700), Palmer Dabbelt wrote:
> > On Wed, 25 May 2022 15:56:07 PDT (-0700), [email protected] wrote:
> >> On 5/25/22 14:34, Palmer Dabbelt wrote:
> >>> On Wed, 25 May 2022 14:15:03 PDT (-0700), [email protected] wrote:
> >>>> On 5/25/22 09:04, [email protected] wrote:
> >>>>> From: Guo Ren <[email protected]>
> >>>>>
> >>>>> This is a fixup for vdso implementation which caused musl to
> >>>>> fail.
> >>>>>
> >>>>> [ 11.600082] Run /sbin/init as init process
> >>>>> [ 11.628561] init[1]: unhandled signal 11 code 0x1 at
> >>>>> 0x0000000000000000 in libc.so[ffffff8ad39000+a4000]
> >>>>> [ 11.629398] CPU: 0 PID: 1 Comm: init Not tainted
> >>>>> 5.18.0-rc7-next-20220520 #1
> >>>>> [ 11.629462] Hardware name: riscv-virtio,qemu (DT)
> >>>>> [ 11.629546] epc : 00ffffff8ada1100 ra : 00ffffff8ada13c8 sp :
> >>>>> 00ffffffc58199f0
> >>>>> [ 11.629586] gp : 00ffffff8ad39000 tp : 00ffffff8ade0998 t0 :
> >>>>> ffffffffffffffff
> >>>>> [ 11.629598] t1 : 00ffffffc5819fd0 t2 : 0000000000000000 s0 :
> >>>>> 00ffffff8ade0cc0
> >>>>> [ 11.629610] s1 : 00ffffff8ade0cc0 a0 : 0000000000000000 a1 :
> >>>>> 00ffffffc5819a00
> >>>>> [ 11.629622] a2 : 0000000000000001 a3 : 000000000000001e a4 :
> >>>>> 00ffffffc5819b00
> >>>>> [ 11.629634] a5 : 00ffffffc5819b00 a6 : 0000000000000000 a7 :
> >>>>> 0000000000000000
> >>>>> [ 11.629645] s2 : 00ffffff8ade0ac8 s3 : 00ffffff8ade0ec8 s4 :
> >>>>> 00ffffff8ade0728
> >>>>> [ 11.629656] s5 : 00ffffff8ade0a90 s6 : 0000000000000000 s7 :
> >>>>> 00ffffffc5819e40
> >>>>> [ 11.629667] s8 : 00ffffff8ade0ca0 s9 : 00ffffff8addba50 s10:
> >>>>> 0000000000000000
> >>>>> [ 11.629678] s11: 0000000000000000 t3 : 0000000000000002 t4 :
> >>>>> 0000000000000001
> >>>>> [ 11.629688] t5 : 0000000000020000 t6 : ffffffffffffffff
> >>>>> [ 11.629699] status: 0000000000004020 badaddr: 0000000000000000
> >>>>> cause: 000000000000000d
> >>>>>
> >>>>> The last __vdso_init(&compat_vdso_info) replaces the data in normal
> >>>>> vdso_info. This is an obvious bug.
> >>>>>
> >>>>> Reported-by: Guenter Roeck <[email protected]>
> >>>>> Signed-off-by: Guo Ren <[email protected]>
> >>>>> Signed-off-by: Guo Ren <[email protected]>
> >>>>> Cc: Palmer Dabbelt <[email protected]>
> >>>>> Cc: Heiko Stübner <[email protected]>
> >>>>
> >>>> Tested-by: Guenter Roeck <[email protected]>
> >>>
> >>> Sorry I'm a bit buried right now, this is fixing the issue you pointed out earlier?
> >>>
> >> Yes.
> >
> > Awosome, I think that was the only big blocker so far.
> >
> > I added a musl-based userspace to my test setup, which is rv64-only
> > (buildroot doesn't have rv32 musl, I thought upstream had it but maybe
> > i'm misremembering). This patch fixes the bug, so I've added it to
> > for-next with
>
> Just saw the v2, so I'm using that instead.
Sorry, v2 should be abandoned. Just adding Tested-by is enough.

>
> >
> > Fixes: 3092eb456375 ("riscv: compat: vdso: Add setup additional pages implementation")
> >
> > which I think is correct, but LMK if there's an issue.
> >
> > Thanks!
> >
> > (and also sorry I poked Geert instead of you about this one, oops ;))
> >
> >>
> >> Thanks,
> >> Guenter
> >>
> >>>>
> >>>>> ---
> >>>>> arch/riscv/kernel/vdso.c | 15 +++++++++++++--
> >>>>> 1 file changed, 13 insertions(+), 2 deletions(-)
> >>>>>
> >>>>> diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c
> >>>>> index 50fe4c877603..69b05b6c181b 100644
> >>>>> --- a/arch/riscv/kernel/vdso.c
> >>>>> +++ b/arch/riscv/kernel/vdso.c
> >>>>> @@ -206,12 +206,23 @@ static struct __vdso_info vdso_info __ro_after_init = {
> >>>>> };
> >>>>>
> >>>>> #ifdef CONFIG_COMPAT
> >>>>> +static struct vm_special_mapping rv_compat_vdso_maps[] __ro_after_init = {
> >>>>> + [RV_VDSO_MAP_VVAR] = {
> >>>>> + .name = "[vvar]",
> >>>>> + .fault = vvar_fault,
> >>>>> + },
> >>>>> + [RV_VDSO_MAP_VDSO] = {
> >>>>> + .name = "[vdso]",
> >>>>> + .mremap = vdso_mremap,
> >>>>> + },
> >>>>> +};
> >>>>> +
> >>>>> static struct __vdso_info compat_vdso_info __ro_after_init = {
> >>>>> .name = "compat_vdso",
> >>>>> .vdso_code_start = compat_vdso_start,
> >>>>> .vdso_code_end = compat_vdso_end,
> >>>>> - .dm = &rv_vdso_maps[RV_VDSO_MAP_VVAR],
> >>>>> - .cm = &rv_vdso_maps[RV_VDSO_MAP_VDSO],
> >>>>> + .dm = &rv_compat_vdso_maps[RV_VDSO_MAP_VVAR],
> >>>>> + .cm = &rv_compat_vdso_maps[RV_VDSO_MAP_VDSO],
> >>>>> };
> >>>>> #endif
> >>>>>



--
Best Regards
Guo Ren

ML: https://lore.kernel.org/linux-csky/