From: Jordan Niethe <jniethe5@gmail.com>
To: Balamuruhan S <bala24@linux.ibm.com>
Cc: Alistair Popple <alistair@popple.id.au>,
linuxppc-dev@lists.ozlabs.org,
Nicholas Piggin <npiggin@gmail.com>,
Daniel Axtens <dja@axtens.net>
Subject: Re: [PATCH v5 11/21] powerpc: Define and use __get_user_instr{, inatomic}()
Date: Wed, 8 Apr 2020 12:13:36 +1000 [thread overview]
Message-ID: <CACzsE9r2Mp8MMwN9=sGdtCDSWM+KY7nsv6czw4-iosRtuuJg9g@mail.gmail.com> (raw)
In-Reply-To: <fa3e7acbe5b691060dc4f9635031733ffc36f92b.camel@linux.ibm.com>
On Tue, Apr 7, 2020 at 8:48 PM Balamuruhan S <bala24@linux.ibm.com> wrote:
>
> On Mon, 2020-04-06 at 18:09 +1000, Jordan Niethe wrote:
> > Define specific __get_user_instr() and __get_user_instr_inatomic()
> > macros for reading instructions from user space.
> >
> > Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
> > ---
> > arch/powerpc/include/asm/uaccess.h | 5 +++++
> > arch/powerpc/kernel/align.c | 2 +-
> > arch/powerpc/kernel/hw_breakpoint.c | 2 +-
> > arch/powerpc/kernel/vecemu.c | 2 +-
> > 4 files changed, 8 insertions(+), 3 deletions(-)
> >
> > diff --git a/arch/powerpc/include/asm/uaccess.h
> > b/arch/powerpc/include/asm/uaccess.h
> > index 2f500debae21..c0a35e4586a5 100644
> > --- a/arch/powerpc/include/asm/uaccess.h
> > +++ b/arch/powerpc/include/asm/uaccess.h
> > @@ -105,6 +105,11 @@ static inline int __access_ok(unsigned long addr,
> > unsigned long size,
> > #define __put_user_inatomic(x, ptr) \
> > __put_user_nosleep((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
> >
> > +#define __get_user_instr(x, ptr) \
> > + __get_user_nocheck((x).val, (u32 *)(ptr), sizeof(u32), true)
> > +
> > +#define __get_user_instr_inatomic(x, ptr) \
> > + __get_user_nosleep((x).val, (u32 *)(ptr), sizeof(u32))
>
>
> should we use ppc_inst_val() ?
The __get_user() macros load a value into the given variable, so we
can not use ppc_inst_val().
>
> -- Bala
>
>
> > extern long __put_user_bad(void);
> >
> > /*
> > diff --git a/arch/powerpc/kernel/align.c b/arch/powerpc/kernel/align.c
> > index 66a6d1de7799..65cdfd41e3a1 100644
> > --- a/arch/powerpc/kernel/align.c
> > +++ b/arch/powerpc/kernel/align.c
> > @@ -304,7 +304,7 @@ int fix_alignment(struct pt_regs *regs)
> > */
> > CHECK_FULL_REGS(regs);
> >
> > - if (unlikely(__get_user(instr.val, (unsigned int __user *)regs->nip)))
> > + if (unlikely(__get_user_instr(instr, (void __user *)regs->nip)))
> > return -EFAULT;
> > if ((regs->msr & MSR_LE) != (MSR_KERNEL & MSR_LE)) {
> > /* We don't handle PPC little-endian any more... */
> > diff --git a/arch/powerpc/kernel/hw_breakpoint.c
> > b/arch/powerpc/kernel/hw_breakpoint.c
> > index 542f65ccf68b..cebab14e2788 100644
> > --- a/arch/powerpc/kernel/hw_breakpoint.c
> > +++ b/arch/powerpc/kernel/hw_breakpoint.c
> > @@ -249,7 +249,7 @@ static bool stepping_handler(struct pt_regs *regs, struct
> > perf_event *bp,
> > struct instruction_op op;
> > unsigned long addr = info->address;
> >
> > - if (__get_user_inatomic(instr.val, (unsigned int *)regs->nip))
> > + if (__get_user_instr_inatomic(instr, (void __user *)regs->nip))
> > goto fail;
> >
> > ret = analyse_instr(&op, regs, instr);
> > diff --git a/arch/powerpc/kernel/vecemu.c b/arch/powerpc/kernel/vecemu.c
> > index bbf536e10902..c82ede46d71b 100644
> > --- a/arch/powerpc/kernel/vecemu.c
> > +++ b/arch/powerpc/kernel/vecemu.c
> > @@ -266,7 +266,7 @@ int emulate_altivec(struct pt_regs *regs)
> > unsigned int va, vb, vc, vd;
> > vector128 *vrs;
> >
> > - if (get_user(instr.val, (unsigned int __user *) regs->nip))
> > + if (__get_user_instr(instr, (void __user *) regs->nip))
> > return -EFAULT;
> >
> > word = ppc_inst_val(instr);
>
next prev parent reply other threads:[~2020-04-08 2:17 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-06 8:09 [PATCH v5 00/21] Initial Prefixed Instruction support Jordan Niethe
2020-04-06 8:09 ` [PATCH v5 01/21] powerpc/xmon: Remove store_inst() for patch_instruction() Jordan Niethe
2020-04-06 8:09 ` [PATCH v5 02/21] powerpc/xmon: Move out-of-line instructions to text section Jordan Niethe
2020-04-07 6:45 ` Balamuruhan S
2020-04-09 6:11 ` Christophe Leroy
2020-04-09 7:26 ` Jordan Niethe
2020-04-06 8:09 ` [PATCH v5 03/21] powerpc: Change calling convention for create_branch() et. al Jordan Niethe
2020-04-06 10:25 ` kbuild test robot
2020-04-07 6:10 ` Balamuruhan S
2020-04-07 6:35 ` Jordan Niethe
2020-04-07 6:59 ` Balamuruhan S
2020-04-06 8:09 ` [PATCH v5 04/21] powerpc: Use a macro for creating instructions from u32s Jordan Niethe
2020-04-07 6:40 ` Balamuruhan S
2020-04-07 8:27 ` Jordan Niethe
2020-04-06 8:09 ` [PATCH v5 05/21] powerpc: Use a function for getting the instruction op code Jordan Niethe
2020-04-06 8:22 ` Christophe Leroy
2020-04-06 9:38 ` Jordan Niethe
2020-04-07 7:04 ` Balamuruhan S
2020-04-07 8:32 ` Jordan Niethe
2020-04-08 18:21 ` Segher Boessenkool
2020-04-09 4:48 ` Jordan Niethe
2020-04-06 8:09 ` [PATCH v5 06/21] powerpc: Use an accessor for instructions Jordan Niethe
2020-04-06 8:09 ` [PATCH v5 07/21] powerpc: Use a function for byte swapping instructions Jordan Niethe
2020-04-07 7:42 ` Balamuruhan S
2020-04-06 8:09 ` [PATCH v5 08/21] powerpc: Introduce functions for instruction equality Jordan Niethe
2020-04-07 7:37 ` Balamuruhan S
2020-04-06 8:09 ` [PATCH v5 09/21] powerpc: Use a datatype for instructions Jordan Niethe
2020-04-06 10:34 ` kbuild test robot
2020-04-06 10:35 ` kbuild test robot
2020-04-07 10:30 ` Balamuruhan S
2020-04-08 2:11 ` Jordan Niethe
2020-04-06 8:09 ` [PATCH v5 10/21] powerpc: Use a function for reading instructions Jordan Niethe
2020-04-07 10:42 ` Balamuruhan S
2020-04-06 8:09 ` [PATCH v5 11/21] powerpc: Define and use __get_user_instr{, inatomic}() Jordan Niethe
2020-04-07 10:48 ` Balamuruhan S
2020-04-08 2:13 ` Jordan Niethe [this message]
2020-04-06 8:09 ` [PATCH v5 12/21] powerpc: Introduce a function for reporting instruction length Jordan Niethe
2020-04-07 11:14 ` Balamuruhan S
2020-04-08 2:14 ` Jordan Niethe
2020-04-06 8:09 ` [PATCH v5 13/21] powerpc/xmon: Use a function for reading instructions Jordan Niethe
2020-04-07 11:30 ` Balamuruhan S
2020-04-08 2:18 ` Jordan Niethe
2020-04-09 5:04 ` Balamuruhan S
2020-04-09 5:14 ` Jordan Niethe
2020-04-06 8:09 ` [PATCH v5 14/21] powerpc/xmon: Move insertion of breakpoint for xol'ing Jordan Niethe
2020-04-06 8:09 ` [PATCH v5 15/21] powerpc: Make test_translate_branch() independent of instruction length Jordan Niethe
2020-04-06 8:09 ` [PATCH v5 16/21] powerpc: Enable Prefixed Instructions Jordan Niethe
2020-04-06 8:09 ` [PATCH v5 17/21] powerpc: Define new SRR1 bits for a future ISA version Jordan Niethe
2020-04-06 8:09 ` [PATCH v5 18/21] powerpc64: Add prefixed instructions to instruction data type Jordan Niethe
2020-04-06 9:52 ` Alistair Popple
2020-04-06 10:25 ` Christophe Leroy
2020-04-06 11:13 ` Jordan Niethe
2020-04-08 18:11 ` Segher Boessenkool
2020-04-08 18:43 ` Christophe Leroy
2020-04-06 10:42 ` Jordan Niethe
2020-04-07 1:39 ` Alistair Popple
2020-04-06 11:04 ` kbuild test robot
2020-04-13 12:04 ` Balamuruhan S
2020-04-15 4:40 ` Jordan Niethe
2020-04-15 8:14 ` Balamuruhan S
2020-04-06 8:09 ` [PATCH v5 19/21] powerpc: Support prefixed instructions in alignment handler Jordan Niethe
2020-04-06 8:09 ` [PATCH v5 20/21] powerpc sstep: Add support for prefixed load/stores Jordan Niethe
2020-04-06 11:29 ` kbuild test robot
2020-04-06 8:09 ` [PATCH v5 21/21] powerpc sstep: Add support for prefixed fixed-point arithmetic Jordan Niethe
2020-04-09 6:39 ` [PATCH v5 00/21] Initial Prefixed Instruction support Christophe Leroy
2020-04-09 7:28 ` Jordan Niethe
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