From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: Christophe Leroy <christophe.leroy@csgroup.eu>,
linuxppc-dev@lists.ozlabs.org, mpe@ellerman.id.au
Cc: Sandipan Das <sandipan@linux.ibm.com>
Subject: Re: [PATCH v6 11/22] powerpc/book3s64/pkeys: Inherit correctly on fork.
Date: Wed, 25 Nov 2020 19:26:57 +0530 [thread overview]
Message-ID: <fd37ed84-6b46-17ed-af48-d303dd0da355@linux.ibm.com> (raw)
In-Reply-To: <38a05d5e-5009-9a00-c1fb-5dd60bba1802@csgroup.eu>
On 11/25/20 7:24 PM, Christophe Leroy wrote:
>
>
> Le 25/11/2020 à 06:16, Aneesh Kumar K.V a écrit :
>> Child thread.kuap value is inherited from the parent in
>> copy_thread_tls. We still
>> need to make sure when the child returns from a fork in the kernel we
>> start with the kernel
>> default AMR value.
>>
>> Reviewed-by: Sandipan Das <sandipan@linux.ibm.com>
>> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
>> ---
>> arch/powerpc/kernel/process.c | 11 +++++++++++
>> 1 file changed, 11 insertions(+)
>>
>> diff --git a/arch/powerpc/kernel/process.c
>> b/arch/powerpc/kernel/process.c
>> index b6b8a845e454..733680de0ba4 100644
>> --- a/arch/powerpc/kernel/process.c
>> +++ b/arch/powerpc/kernel/process.c
>> @@ -1768,6 +1768,17 @@ int copy_thread(unsigned long clone_flags,
>> unsigned long usp,
>> childregs->ppr = DEFAULT_PPR;
>> p->thread.tidr = 0;
>> +#endif
>> + /*
>> + * Run with the current AMR value of the kernel
>> + */
>> +#ifdef CONFIG_PPC_KUAP
>> + if (mmu_has_feature(MMU_FTR_KUAP))
>> + kregs->kuap = AMR_KUAP_BLOCKED;
>> +#endif
>
> Do we need that ifdef at all ?
>
> Shouldn't mmu_has_feature(MMU_FTR_KUAP) be always false and get
> optimised out when CONFIG_PPC_KUAP is not defined ?
>
>> +#ifdef CONFIG_PPC_KUEP
>> + if (mmu_has_feature(MMU_FTR_KUEP))
>> + kregs->iamr = AMR_KUEP_BLOCKED;
>
> Same ?
>
>> #endif
>> kregs->nip = ppc_function_entry(f);
>> return 0;
>>
Not really. I did hit a compile error with this patch on
mpc885_ads_defconfig and that required me to do
modified arch/powerpc/kernel/process.c
@@ -1772,11 +1772,10 @@ int copy_thread(unsigned long clone_flags,
unsigned long usp,
/*
* Run with the current AMR value of the kernel
*/
-#ifdef CONFIG_PPC_KUAP
+#ifdef CONFIG_PPC_PKEY
if (mmu_has_feature(MMU_FTR_KUAP))
- kregs->kuap = AMR_KUAP_BLOCKED;
-#endif
-#ifdef CONFIG_PPC_KUEP
+ kregs->amr = AMR_KUAP_BLOCKED;
+
if (mmu_has_feature(MMU_FTR_KUEP))
kregs->iamr = AMR_KUEP_BLOCKED;
#endif
next prev parent reply other threads:[~2020-11-25 14:24 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-25 5:16 [PATCH v6 00/22] Kernel userspace access/execution prevention with hash translation Aneesh Kumar K.V
2020-11-25 5:16 ` [PATCH v6 01/22] powerpc: Add new macro to handle NESTED_IFCLR Aneesh Kumar K.V
2020-11-25 5:16 ` [PATCH v6 02/22] KVM: PPC: BOOK3S: PR: Ignore UAMOR SPR Aneesh Kumar K.V
2020-11-25 5:16 ` [PATCH v6 03/22] powerpc/book3s64/kuap/kuep: Make KUAP and KUEP a subfeature of PPC_MEM_KEYS Aneesh Kumar K.V
2020-11-25 13:30 ` Christophe Leroy
2020-11-25 14:57 ` Aneesh Kumar K.V
2020-11-26 3:25 ` Michael Ellerman
2020-11-25 5:16 ` [PATCH v6 04/22] powerpc/book3s64/kuap/kuep: Move uamor setup to pkey init Aneesh Kumar K.V
2020-11-25 13:32 ` Christophe Leroy
2020-11-26 3:28 ` Michael Ellerman
2020-11-25 5:16 ` [PATCH v6 05/22] powerpc/book3s64/kuap: Move KUAP related function outside radix Aneesh Kumar K.V
2020-11-25 5:16 ` [PATCH v6 06/22] powerpc/book3s64/kuep: Move KUEP " Aneesh Kumar K.V
2020-11-25 5:16 ` [PATCH v6 07/22] powerpc/book3s64/kuap: Rename MMU_FTR_RADIX_KUAP to MMU_FTR_KUAP Aneesh Kumar K.V
2020-11-25 13:43 ` Christophe Leroy
2020-11-25 13:52 ` Aneesh Kumar K.V
2020-11-26 3:16 ` Michael Ellerman
2020-11-25 5:16 ` [PATCH v6 08/22] powerpc/book3s64/kuap: Use Key 3 for kernel mapping with hash translation Aneesh Kumar K.V
2020-11-25 5:16 ` [PATCH v6 09/22] powerpc/exec: Set thread.regs early during exec Aneesh Kumar K.V
2020-11-25 13:47 ` Christophe Leroy
2020-11-26 7:38 ` Aneesh Kumar K.V
2020-11-26 7:43 ` Christophe Leroy
2020-11-25 5:16 ` [PATCH v6 10/22] powerpc/book3s64/pkeys: Store/restore userspace AMR/IAMR correctly on entry and exit from kernel Aneesh Kumar K.V
2020-11-25 13:52 ` Christophe Leroy
2020-11-25 13:55 ` Aneesh Kumar K.V
2020-11-25 14:16 ` Christophe Leroy
2020-11-25 5:16 ` [PATCH v6 11/22] powerpc/book3s64/pkeys: Inherit correctly on fork Aneesh Kumar K.V
2020-11-25 13:54 ` Christophe Leroy
2020-11-25 13:56 ` Aneesh Kumar K.V [this message]
2020-11-25 5:16 ` [PATCH v6 12/22] powerpc/book3s64/pkeys: Reset userspace AMR correctly on exec Aneesh Kumar K.V
2020-11-25 5:16 ` [PATCH v6 13/22] powerpc/ptrace-view: Use pt_regs values instead of thread_struct based one Aneesh Kumar K.V
2020-11-25 5:16 ` [PATCH v6 14/22] powerpc/book3s64/pkeys: Don't update SPRN_AMR when in kernel mode Aneesh Kumar K.V
2020-11-25 5:16 ` [PATCH v6 15/22] powerpc/book3s64/kuap: Restrict access to userspace based on userspace AMR Aneesh Kumar K.V
2020-11-25 5:16 ` [PATCH v6 16/22] powerpc/book3s64/kuap: Improve error reporting with KUAP Aneesh Kumar K.V
2020-11-25 14:04 ` Christophe Leroy
2020-11-26 7:44 ` Aneesh Kumar K.V
2020-11-26 9:29 ` Michael Ellerman
2020-11-26 10:39 ` Christophe Leroy
2020-11-25 5:16 ` [PATCH v6 17/22] powerpc/book3s64/kuap: Use Key 3 to implement KUAP with hash translation Aneesh Kumar K.V
2020-11-25 5:16 ` [PATCH v6 18/22] powerpc/book3s64/kuep: Use Key 3 to implement KUEP " Aneesh Kumar K.V
2020-11-25 5:16 ` [PATCH v6 19/22] powerpc/book3s64/hash/kuap: Enable kuap on hash Aneesh Kumar K.V
2021-03-15 12:06 ` Christophe Leroy
2021-03-15 12:59 ` Aneesh Kumar K.V
2021-03-15 13:02 ` Christophe Leroy
2021-10-08 9:32 ` Christophe Leroy
2021-10-11 3:28 ` Michael Ellerman
2020-11-25 5:16 ` [PATCH v6 20/22] powerpc/book3s64/hash/kuep: Enable KUEP " Aneesh Kumar K.V
2020-11-25 5:16 ` [PATCH v6 21/22] powerpc/book3s64/hash/kup: Don't hardcode kup key Aneesh Kumar K.V
2020-11-25 5:16 ` [PATCH v6 22/22] powerpc/book3s64/pkeys: Optimize FTR_KUAP and FTR_KUEP disabled case Aneesh Kumar K.V
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