[DTrace-devel] [PATCH 11/12] Add support for copyinto() subroutine
Eugene Loh
eugene.loh at oracle.com
Sat Jul 23 03:38:47 UTC 2022
Reviewed-by: Eugene Loh <eugene.loh at oracle.com>
There really seems like considerable opportunity to share code between
copyinto() and bcopy().
test/unittest/funcs/copyinto/tst.copyinto.d needs results to be checked
with a .r file, as you are now doing with the related patches.
Dropping the "SECTION" comments from the tests makes sense to me, but if
we want to keep them the SECTION for
test/unittest/funcs/copyinto/err.badsize.d looks wrong.
On 7/13/22 12:18, Kris Van Hees via DTrace-devel wrote:
> The copyinto() subroutine is a near-identical copy of bcopy() other
> than that the arguments are ordered differently, and it reads from
> userspace addresses rather than kernel addresses.
>
> Signed-off-by: Kris Van Hees <kris.van.hees at oracle.com>
> ---
> libdtrace/dt_cg.c | 73 ++++++++++++++++++-
> .../err.D_PROTO_ARG.non_alloca_arg3-2.d | 23 ++++++
> .../err.D_PROTO_ARG.non_alloca_arg3.d | 23 ++++++
> .../copyinto/err.D_PROTO_ARG.non_ptr_arg3.d | 23 ++++++
> .../err.D_PROTO_ARG.non_scalar_arg1.d | 23 ++++++
> .../err.D_PROTO_ARG.non_scalar_arg2.d | 23 ++++++
> .../copyinto/err.D_PROTO_LEN.missing_arg.d | 23 ++++++
> .../copyinto/err.D_PROTO_LEN.too_few_args.d | 23 ++++++
> .../copyinto/err.D_PROTO_LEN.too_many_args.d | 23 ++++++
> test/unittest/funcs/copyinto/err.badaddr.d | 24 ++++++
> test/unittest/funcs/copyinto/err.badaddr.r | 6 ++
> test/unittest/funcs/copyinto/err.badsize.d | 25 +++++++
> test/unittest/funcs/copyinto/err.badsize.r | 6 ++
> test/unittest/funcs/copyinto/err.null_arg1.d | 24 ++++++
> test/unittest/funcs/copyinto/err.null_arg1.r | 6 ++
> test/unittest/funcs/copyinto/tst.copyinto.d | 27 +++++++
> test/unittest/funcs/tst.copyinto.d | 36 ---------
> 17 files changed, 374 insertions(+), 37 deletions(-)
> create mode 100644 test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_alloca_arg3-2.d
> create mode 100644 test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_alloca_arg3.d
> create mode 100644 test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_ptr_arg3.d
> create mode 100644 test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_scalar_arg1.d
> create mode 100644 test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_scalar_arg2.d
> create mode 100644 test/unittest/funcs/copyinto/err.D_PROTO_LEN.missing_arg.d
> create mode 100644 test/unittest/funcs/copyinto/err.D_PROTO_LEN.too_few_args.d
> create mode 100644 test/unittest/funcs/copyinto/err.D_PROTO_LEN.too_many_args.d
> create mode 100644 test/unittest/funcs/copyinto/err.badaddr.d
> create mode 100644 test/unittest/funcs/copyinto/err.badaddr.r
> create mode 100644 test/unittest/funcs/copyinto/err.badsize.d
> create mode 100644 test/unittest/funcs/copyinto/err.badsize.r
> create mode 100644 test/unittest/funcs/copyinto/err.null_arg1.d
> create mode 100644 test/unittest/funcs/copyinto/err.null_arg1.r
> create mode 100644 test/unittest/funcs/copyinto/tst.copyinto.d
> delete mode 100644 test/unittest/funcs/tst.copyinto.d
>
> diff --git a/libdtrace/dt_cg.c b/libdtrace/dt_cg.c
> index 9a4a80d0..265a6408 100644
> --- a/libdtrace/dt_cg.c
> +++ b/libdtrace/dt_cg.c
> @@ -4325,6 +4325,77 @@ dt_cg_subr_copyin(dt_node_t *dnp, dt_irlist_t *dlp, dt_regset_t *drp)
> TRACE_REGSET(" subr-copyin:End ");
> }
>
> +static void
> +dt_cg_subr_copyinto(dt_node_t *dnp, dt_irlist_t *dlp, dt_regset_t *drp)
> +{
> + dtrace_hdl_t *dtp = yypcb->pcb_hdl;
> + dt_node_t *src = dnp->dn_args;
> + dt_node_t *size = src->dn_list;
> + dt_node_t *dst = size->dn_list;
> + int maxsize = dtp->dt_options[DTRACEOPT_SCRATCHSIZE] - 8;
> + uint_t lbl_badsize = dt_irlist_label(dlp);
> + uint_t lbl_ok = dt_irlist_label(dlp);
> +
> + TRACE_REGSET(" subr-copyinto:Begin");
> +
> + /* Validate the size for the copy operation. */
> + dt_cg_node(size, dlp, drp);
> +
> + emit(dlp, BPF_BRANCH_IMM(BPF_JSLT, size->dn_reg, 0, lbl_badsize));
> + emit(dlp, BPF_BRANCH_IMM(BPF_JGT, size->dn_reg, maxsize, lbl_badsize));
> +
> + /* Validate the source pointer. */
> + dt_cg_node(src, dlp, drp);
> + if (src->dn_flags & DT_NF_ALLOCA)
> + dnerror(src, D_PROTO_ARG,
> + "copyinto( ) argument #1 is incompatible with prototype:\n"
> + "\tprototype: non-alloca pointer\n"
> + "\t argument: alloca pointer\n");
> + dt_cg_check_notnull(dlp, drp, src->dn_reg);
> +
> + /* Validate the destination pointer. */
> + dt_cg_node(dst, dlp, drp);
> + if (!(dst->dn_flags & DT_NF_ALLOCA))
> + dnerror(dst, D_PROTO_ARG,
> + "copyinto( ) argument #3 is incompatible with prototype:\n"
> + "\tprototype: alloca pointer\n"
> + "\t argument: non-alloca pointer\n");
> + /* The dst will be NULL-checked in the alloca access check below. */
> +
> + dt_cg_alloca_access_check(dlp, drp, dst->dn_reg,
> + DT_ISREG, size->dn_reg);
> + dt_cg_alloca_ptr(dlp, drp, dst->dn_reg, dst->dn_reg);
> +
> + if (dt_regset_xalloc_args(drp) == -1)
> + longjmp(yypcb->pcb_jmpbuf, EDT_NOREG);
> +
> + emit(dlp, BPF_MOV_REG(BPF_REG_1, dst->dn_reg));
> + emit(dlp, BPF_MOV_REG(BPF_REG_2, size->dn_reg));
> + emit(dlp, BPF_MOV_REG(BPF_REG_3, src->dn_reg));
> + dt_regset_xalloc(drp, BPF_REG_0);
> + emit(dlp, BPF_CALL_HELPER(dtp->dt_bpfhelper[BPF_FUNC_probe_read_user]));
> +
> + /*
> + * At this point the dst is validated, so any problem must be with
> + * the src address.
> + */
> + emit(dlp, BPF_BRANCH_IMM(BPF_JEQ, BPF_REG_0, 0, lbl_ok));
> + dt_regset_free(drp, BPF_REG_0);
> + dt_regset_free_args(drp);
> + dt_cg_probe_error(yypcb, DTRACEFLT_BADADDR, DT_ISREG, src->dn_reg);
> + emitl(dlp, lbl_badsize,
> + BPF_NOP());
> + dt_cg_probe_error(yypcb, DTRACEFLT_BADSIZE, DT_ISREG, size->dn_reg);
> + emitl(dlp, lbl_ok,
> + BPF_NOP());
> +
> + dt_regset_free(drp, src->dn_reg);
> + dt_regset_free(drp, dst->dn_reg);
> + dt_regset_free(drp, size->dn_reg);
> +
> + TRACE_REGSET(" subr-copyinto:End ");
> +}
> +
> static void
> dt_cg_subr_strchr(dt_node_t *dnp, dt_irlist_t *dlp, dt_regset_t *drp)
> {
> @@ -4805,7 +4876,7 @@ static dt_cg_subr_f *_dt_cg_subr[DIF_SUBR_MAX + 1] = {
> [DIF_SUBR_COPYOUTSTR] = NULL,
> [DIF_SUBR_ALLOCA] = &dt_cg_subr_alloca,
> [DIF_SUBR_BCOPY] = &dt_cg_subr_bcopy,
> - [DIF_SUBR_COPYINTO] = NULL,
> + [DIF_SUBR_COPYINTO] = &dt_cg_subr_copyinto,
> [DIF_SUBR_MSGDSIZE] = NULL,
> [DIF_SUBR_MSGSIZE] = NULL,
> [DIF_SUBR_GETMAJOR] = &dt_cg_subr_getmajor,
> diff --git a/test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_alloca_arg3-2.d b/test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_alloca_arg3-2.d
> new file mode 100644
> index 00000000..97dd22a5
> --- /dev/null
> +++ b/test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_alloca_arg3-2.d
> @@ -0,0 +1,23 @@
> +/*
> + * Oracle Linux DTrace.
> + * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
> + * Licensed under the Universal Permissive License v 1.0 as shown at
> + * http://oss.oracle.com/licenses/upl.
> + */
> +
> +/*
> + * ASSERTION: Argument 3 for copyinto() must be an alloca() pointer.
> + *
> + * SECTION: Actions and Subroutines/copyinto()
> + */
> +
> +BEGIN
> +{
> + copyinto(1, 2, &`max_pfn);
> + exit(1);
> +}
> +
> +ERROR
> +{
> + exit(0);
> +}
> diff --git a/test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_alloca_arg3.d b/test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_alloca_arg3.d
> new file mode 100644
> index 00000000..9ef33904
> --- /dev/null
> +++ b/test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_alloca_arg3.d
> @@ -0,0 +1,23 @@
> +/*
> + * Oracle Linux DTrace.
> + * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
> + * Licensed under the Universal Permissive License v 1.0 as shown at
> + * http://oss.oracle.com/licenses/upl.
> + */
> +
> +/*
> + * ASSERTION: Argument 3 for copyinto() must be an alloca() pointer.
> + *
> + * SECTION: Actions and Subroutines/copyinto()
> + */
> +
> +BEGIN
> +{
> + copyinto(1, 2, "");
> + exit(1);
> +}
> +
> +ERROR
> +{
> + exit(0);
> +}
> diff --git a/test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_ptr_arg3.d b/test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_ptr_arg3.d
> new file mode 100644
> index 00000000..65b41f63
> --- /dev/null
> +++ b/test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_ptr_arg3.d
> @@ -0,0 +1,23 @@
> +/*
> + * Oracle Linux DTrace.
> + * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
> + * Licensed under the Universal Permissive License v 1.0 as shown at
> + * http://oss.oracle.com/licenses/upl.
> + */
> +
> +/*
> + * ASSERTION: Argument 3 for copyinto() must be a pointer.
> + *
> + * SECTION: Actions and Subroutines/copyinto()
> + */
> +
> +BEGIN
> +{
> + copyinto(1, 2, 3);
> + exit(1);
> +}
> +
> +ERROR
> +{
> + exit(0);
> +}
> diff --git a/test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_scalar_arg1.d b/test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_scalar_arg1.d
> new file mode 100644
> index 00000000..8cdf7746
> --- /dev/null
> +++ b/test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_scalar_arg1.d
> @@ -0,0 +1,23 @@
> +/*
> + * Oracle Linux DTrace.
> + * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
> + * Licensed under the Universal Permissive License v 1.0 as shown at
> + * http://oss.oracle.com/licenses/upl.
> + */
> +
> +/*
> + * ASSERTION: Argument 1 for copyinto() must be a scalar.
> + *
> + * SECTION: Actions and Subroutines/copyinto()
> + */
> +
> +BEGIN
> +{
> + copyinto("1", 2, 3);
> + exit(1);
> +}
> +
> +ERROR
> +{
> + exit(0);
> +}
> diff --git a/test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_scalar_arg2.d b/test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_scalar_arg2.d
> new file mode 100644
> index 00000000..077f38a5
> --- /dev/null
> +++ b/test/unittest/funcs/copyinto/err.D_PROTO_ARG.non_scalar_arg2.d
> @@ -0,0 +1,23 @@
> +/*
> + * Oracle Linux DTrace.
> + * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
> + * Licensed under the Universal Permissive License v 1.0 as shown at
> + * http://oss.oracle.com/licenses/upl.
> + */
> +
> +/*
> + * ASSERTION: Argument 2 for copyinto() must be a scalar.
> + *
> + * SECTION: Actions and Subroutines/copyinto()
> + */
> +
> +BEGIN
> +{
> + copyinto(1, "2", 3);
> + exit(1);
> +}
> +
> +ERROR
> +{
> + exit(0);
> +}
> diff --git a/test/unittest/funcs/copyinto/err.D_PROTO_LEN.missing_arg.d b/test/unittest/funcs/copyinto/err.D_PROTO_LEN.missing_arg.d
> new file mode 100644
> index 00000000..3d0813f5
> --- /dev/null
> +++ b/test/unittest/funcs/copyinto/err.D_PROTO_LEN.missing_arg.d
> @@ -0,0 +1,23 @@
> +/*
> + * Oracle Linux DTrace.
> + * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
> + * Licensed under the Universal Permissive License v 1.0 as shown at
> + * http://oss.oracle.com/licenses/upl.
> + */
> +
> +/*
> + * ASSERTION: Arguments are required for copyinto().
> + *
> + * SECTION: Actions and Subroutines/copyinto()
> + */
> +
> +BEGIN
> +{
> + copyinto();
> + exit(1);
> +}
> +
> +ERROR
> +{
> + exit(0);
> +}
> diff --git a/test/unittest/funcs/copyinto/err.D_PROTO_LEN.too_few_args.d b/test/unittest/funcs/copyinto/err.D_PROTO_LEN.too_few_args.d
> new file mode 100644
> index 00000000..dc756b4d
> --- /dev/null
> +++ b/test/unittest/funcs/copyinto/err.D_PROTO_LEN.too_few_args.d
> @@ -0,0 +1,23 @@
> +/*
> + * Oracle Linux DTrace.
> + * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
> + * Licensed under the Universal Permissive License v 1.0 as shown at
> + * http://oss.oracle.com/licenses/upl.
> + */
> +
> +/*
> + * ASSERTION: Three arguments are required for copyinto().
> + *
> + * SECTION: Actions and Subroutines/copyinto()
> + */
> +
> +BEGIN
> +{
> + copyinto(1, 2);
> + exit(1);
> +}
> +
> +ERROR
> +{
> + exit(0);
> +}
> diff --git a/test/unittest/funcs/copyinto/err.D_PROTO_LEN.too_many_args.d b/test/unittest/funcs/copyinto/err.D_PROTO_LEN.too_many_args.d
> new file mode 100644
> index 00000000..eb408e6a
> --- /dev/null
> +++ b/test/unittest/funcs/copyinto/err.D_PROTO_LEN.too_many_args.d
> @@ -0,0 +1,23 @@
> +/*
> + * Oracle Linux DTrace.
> + * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
> + * Licensed under the Universal Permissive License v 1.0 as shown at
> + * http://oss.oracle.com/licenses/upl.
> + */
> +
> +/*
> + * ASSERTION: Exactly three Arguments are required for copyinto().
> + *
> + * SECTION: Actions and Subroutines/copyinto()
> + */
> +
> +BEGIN
> +{
> + copyin(1, 2, 3, 4);
> + exit(1);
> +}
> +
> +ERROR
> +{
> + exit(0);
> +}
> diff --git a/test/unittest/funcs/copyinto/err.badaddr.d b/test/unittest/funcs/copyinto/err.badaddr.d
> new file mode 100644
> index 00000000..a1d85d70
> --- /dev/null
> +++ b/test/unittest/funcs/copyinto/err.badaddr.d
> @@ -0,0 +1,24 @@
> +/*
> + * Oracle Linux DTrace.
> + * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
> + * Licensed under the Universal Permissive License v 1.0 as shown at
> + * http://oss.oracle.com/licenses/upl.
> + */
> +
> +/*
> + * ASSERTION: Using copyinto() with an invalid source address reports a fault.
> + *
> + * SECTION: Actions and Subroutines/copyinto()
> + */
> +
> +BEGIN
> +{
> + ptr = (char *)alloca(256);
> + copyinto(0x1234, 8, ptr);
> + exit(0);
> +}
> +
> +ERROR
> +{
> + exit(1);
> +}
> diff --git a/test/unittest/funcs/copyinto/err.badaddr.r b/test/unittest/funcs/copyinto/err.badaddr.r
> new file mode 100644
> index 00000000..11861e1f
> --- /dev/null
> +++ b/test/unittest/funcs/copyinto/err.badaddr.r
> @@ -0,0 +1,6 @@
> + FUNCTION:NAME
> + :ERROR
> +
> +-- @@stderr --
> +dtrace: script 'test/unittest/funcs/copyinto/err.badaddr.d' matched 2 probes
> +dtrace: error on enabled probe ID 3 (ID 1: dtrace:::BEGIN): invalid address ({ptr}) in action #1 at BPF pc NNN
> diff --git a/test/unittest/funcs/copyinto/err.badsize.d b/test/unittest/funcs/copyinto/err.badsize.d
> new file mode 100644
> index 00000000..c2b6ab18
> --- /dev/null
> +++ b/test/unittest/funcs/copyinto/err.badsize.d
> @@ -0,0 +1,25 @@
> +/*
> + * Oracle Linux DTrace.
> + * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
> + * Licensed under the Universal Permissive License v 1.0 as shown at
> + * http://oss.oracle.com/licenses/upl.
> + */
> +
> +/*
> + * ASSERTION: The copyinto() size must not exceed the allocated space.
> + *
> + * SECTION: Actions and Subroutines/copyin()
> + * User Process Tracing/copyin() and copyinstr()
> + */
> +
> +BEGIN
> +{
> + ptr = (char *)alloca(64);
> + copyinto(curthread->mm->env_start, 65, ptr);
> + exit(0);
> +}
> +
> +ERROR
> +{
> + exit(1);
> +}
> diff --git a/test/unittest/funcs/copyinto/err.badsize.r b/test/unittest/funcs/copyinto/err.badsize.r
> new file mode 100644
> index 00000000..ec4b062e
> --- /dev/null
> +++ b/test/unittest/funcs/copyinto/err.badsize.r
> @@ -0,0 +1,6 @@
> + FUNCTION:NAME
> + :ERROR
> +
> +-- @@stderr --
> +dtrace: script 'test/unittest/funcs/copyinto/err.badsize.d' matched 2 probes
> +dtrace: error on enabled probe ID 3 (ID 1: dtrace:::BEGIN): invalid size ({ptr}) in action #1 at BPF pc NNN
> diff --git a/test/unittest/funcs/copyinto/err.null_arg1.d b/test/unittest/funcs/copyinto/err.null_arg1.d
> new file mode 100644
> index 00000000..2cb302e0
> --- /dev/null
> +++ b/test/unittest/funcs/copyinto/err.null_arg1.d
> @@ -0,0 +1,24 @@
> +/*
> + * Oracle Linux DTrace.
> + * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
> + * Licensed under the Universal Permissive License v 1.0 as shown at
> + * http://oss.oracle.com/licenses/upl.
> + */
> +
> +/*
> + * ASSERTION: Using copyinto() with a NULL source address reports a fault.
> + *
> + * SECTION: Actions and Subroutines/copyinto()
> + */
> +
> +BEGIN
> +{
> + ptr = (char *)alloca(256);
> + copyinto(0, 8, ptr);
> + exit(0);
> +}
> +
> +ERROR
> +{
> + exit(1);
> +}
> diff --git a/test/unittest/funcs/copyinto/err.null_arg1.r b/test/unittest/funcs/copyinto/err.null_arg1.r
> new file mode 100644
> index 00000000..f568ee5c
> --- /dev/null
> +++ b/test/unittest/funcs/copyinto/err.null_arg1.r
> @@ -0,0 +1,6 @@
> + FUNCTION:NAME
> + :ERROR
> +
> +-- @@stderr --
> +dtrace: script 'test/unittest/funcs/copyinto/err.null_arg1.d' matched 2 probes
> +dtrace: error on enabled probe ID 3 (ID 1: dtrace:::BEGIN): invalid address ({ptr}) in action #1 at BPF pc NNN
> diff --git a/test/unittest/funcs/copyinto/tst.copyinto.d b/test/unittest/funcs/copyinto/tst.copyinto.d
> new file mode 100644
> index 00000000..55890fbd
> --- /dev/null
> +++ b/test/unittest/funcs/copyinto/tst.copyinto.d
> @@ -0,0 +1,27 @@
> +/*
> + * Oracle Linux DTrace.
> + * Copyright (c) 2006, 2022, Oracle and/or its affiliates. All rights reserved.
> + * Licensed under the Universal Permissive License v 1.0 as shown at
> + * http://oss.oracle.com/licenses/upl.
> + */
> +
> +/*
> + * ASSERTION: It is possible to read data from the envp[] userspace area.
> + *
> + * SECTION: Actions and Subroutines/copyinto()
> + */
> +
> +#pragma D option quiet
> +
> +BEGIN
> +{
> + ptr = (char *)alloca(256);
> + copyinto(curthread->mm->env_start, 256, ptr);
> + printf("envp[0] = \"%s\"", stringof(ptr));
> + exit(0);
> +}
> +
> +ERROR
> +{
> + exit(1);
> +}
> diff --git a/test/unittest/funcs/tst.copyinto.d b/test/unittest/funcs/tst.copyinto.d
> deleted file mode 100644
> index b7abfce0..00000000
> --- a/test/unittest/funcs/tst.copyinto.d
> +++ /dev/null
> @@ -1,36 +0,0 @@
> -/*
> - * Oracle Linux DTrace.
> - * Copyright (c) 2006, 2020, Oracle and/or its affiliates. All rights reserved.
> - * Licensed under the Universal Permissive License v 1.0 as shown at
> - * http://oss.oracle.com/licenses/upl.
> - */
> -/* @@xfail: dtv2 */
> -
> -/*
> - * ASSERTION:
> - * test copyinto by copying the first string of the user's
> - * environment.
> - *
> - * SECTION: Actions and Subroutines/copyinto()
> - *
> - */
> -
> -#pragma D option quiet
> -
> -BEGIN
> -/curpsinfo->pr_dmodel == PR_MODEL_ILP32/
> -{
> - envp = alloca(sizeof(uint32_t));
> - copyinto(curpsinfo->pr_envp, sizeof(uint32_t), envp);
> - printf("envp[0] = \"%s\"", copyinstr(*(uint32_t *)envp));
> - exit(0);
> -}
> -
> -BEGIN
> -/curpsinfo->pr_dmodel == PR_MODEL_LP64/
> -{
> - envp = alloca(sizeof(uint64_t));
> - copyinto(curpsinfo->pr_envp, sizeof(uint64_t), envp);
> - printf("envp[0] = \"%s\"", copyinstr(*(uint64_t *)envp));
> - exit(0);
> -}
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