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linux(4): Deduplicate linux_copyout_auxargs()

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Export default MINSIGSTKSZ value for the x86 until we do not preserve AVX
registers in the signal context.

Differential Revision:	https://reviews.freebsd.org/D39644
MFC after:		1 month
This commit is contained in:
Dmitry Chagin 2023-04-22 22:16:02 +03:00
parent 8561d0b2ec
commit 7d8c983983
9 changed files with 96 additions and 204 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sys/amd64/linux/linux.h
View File

@ -90,7 +90,7 @@ typedef struct {
/*
* Miscellaneous
*/
#define LINUX_AT_COUNT 20 /* Count of used aux entry types. */
#define LINUX_AT_COUNT 21 /* Count of used aux entry types. */
struct l___sysctl_args
{

54
sys/amd64/linux/linux_sysvec.c
View File

@ -207,52 +207,14 @@ linux_set_fork_retval(struct thread *td)
frame->tf_rax = 0;
}
static int
linux_copyout_auxargs(struct image_params *imgp, uintptr_t base)
void
linux64_arch_copyout_auxargs(struct image_params *imgp, Elf_Auxinfo **pos)
{
Elf_Auxargs *args;
Elf_Auxinfo *argarray, *pos;
struct proc *p;
int error, issetugid;
p = imgp->proc;
args = (Elf64_Auxargs *)imgp->auxargs;
argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,
M_WAITOK | M_ZERO);
issetugid = p->p_flag & P_SUGID ? 1 : 0;
AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, linux_vdso_base);
AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
AUXARGS_ENTRY(pos, AT_BASE, args->base);
AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary);
AUXARGS_ENTRY(pos, LINUX_AT_HWCAP2, 0);
if (imgp->execpathp != 0)
AUXARGS_ENTRY_PTR(pos, LINUX_AT_EXECFN, imgp->execpathp);
if (args->execfd != -1)
AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
AUXARGS_ENTRY(pos, AT_NULL, 0);
free(imgp->auxargs, M_TEMP);
imgp->auxargs = NULL;
KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs"));
error = copyout(argarray, (void *)base,
sizeof(*argarray) * LINUX_AT_COUNT);
free(argarray, M_TEMP);
return (error);
AUXARGS_ENTRY((*pos), LINUX_AT_SYSINFO_EHDR, linux_vdso_base);
AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP, cpu_feature);
AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP2, 0);
AUXARGS_ENTRY((*pos), LINUX_AT_PLATFORM, PTROUT(linux_platform));
}
/*
@ -623,7 +585,7 @@ struct sysentvec elf_linux_sysvec = {
.sv_psstrings = LINUX_PS_STRINGS_LA48,
.sv_psstringssz = sizeof(struct ps_strings),
.sv_stackprot = VM_PROT_ALL,
.sv_copyout_auxargs = linux_copyout_auxargs,
.sv_copyout_auxargs = __linuxN(copyout_auxargs),
.sv_copyout_strings = __linuxN(copyout_strings),
.sv_setregs = linux_exec_setregs,
.sv_fixlimit = NULL,
@ -638,6 +600,8 @@ struct sysentvec elf_linux_sysvec = {
.sv_schedtail = linux_schedtail,
.sv_thread_detach = linux_thread_detach,
.sv_trap = linux_vsyscall,
.sv_hwcap = NULL,
.sv_hwcap2 = NULL,
.sv_onexec = linux_on_exec_vmspace,
.sv_onexit = linux_on_exit,
.sv_ontdexit = linux_thread_dtor,

2
sys/amd64/linux32/linux.h
View File

@ -103,7 +103,7 @@ typedef struct {
/*
* Miscellaneous
*/
#define LINUX_AT_COUNT 21 /* Count of used aux entry types.
#define LINUX_AT_COUNT 22 /* Count of used aux entry types.
* Keep this synchronized with
* linux_fixup_elf() code.
*/

64
sys/amd64/linux32/linux32_sysvec.c
View File

@ -139,61 +139,15 @@ LINUX_VDSO_SYM_INTPTR(kern_tsc_selector);
LINUX_VDSO_SYM_INTPTR(kern_cpu_selector);
LINUX_VDSO_SYM_CHAR(linux_platform);
static int
linux_copyout_auxargs(struct image_params *imgp, uintptr_t base)
void
linux32_arch_copyout_auxargs(struct image_params *imgp, Elf_Auxinfo **pos)
{
Elf32_Auxargs *args;
Elf32_Auxinfo *argarray, *pos;
int error, issetugid;
args = (Elf32_Auxargs *)imgp->auxargs;
argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,
M_WAITOK | M_ZERO);
issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0;
AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, __kernel_vsyscall);
AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, linux_vdso_base);
AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
/*
* Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0,
* as it has appeared in the 2.4.0-rc7 first time.
* Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK),
* glibc falls back to the hard-coded CLK_TCK value when aux entry
* is not present.
* Also see linux_times() implementation.
*/
if (linux_kernver(curthread) >= LINUX_KERNVER_2004000)
AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
AUXARGS_ENTRY(pos, AT_BASE, args->base);
AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, PTROUT(imgp->canary));
AUXARGS_ENTRY(pos, LINUX_AT_HWCAP2, 0);
if (imgp->execpathp != 0)
AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, PTROUT(imgp->execpathp));
if (args->execfd != -1)
AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
AUXARGS_ENTRY(pos, AT_NULL, 0);
free(imgp->auxargs, M_TEMP);
imgp->auxargs = NULL;
KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs"));
error = copyout(argarray, (void *)base,
sizeof(*argarray) * LINUX_AT_COUNT);
free(argarray, M_TEMP);
return (error);
AUXARGS_ENTRY((*pos), LINUX_AT_SYSINFO, __kernel_vsyscall);
AUXARGS_ENTRY((*pos), LINUX_AT_SYSINFO_EHDR, linux_vdso_base);
AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP, cpu_feature);
AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP2, 0);
AUXARGS_ENTRY((*pos), LINUX_AT_PLATFORM, PTROUT(linux_platform));
}
static void
@ -848,7 +802,7 @@ struct sysentvec elf_linux_sysvec = {
.sv_psstrings = LINUX32_PS_STRINGS,
.sv_psstringssz = sizeof(struct linux32_ps_strings),
.sv_stackprot = VM_PROT_ALL,
.sv_copyout_auxargs = linux_copyout_auxargs,
.sv_copyout_auxargs = __linuxN(copyout_auxargs),
.sv_copyout_strings = linux_copyout_strings,
.sv_setregs = linux_exec_setregs,
.sv_fixlimit = linux32_fixlimit,
@ -863,6 +817,8 @@ struct sysentvec elf_linux_sysvec = {
.sv_schedtail = linux_schedtail,
.sv_thread_detach = linux_thread_detach,
.sv_trap = NULL,
.sv_hwcap = NULL,
.sv_hwcap2 = NULL,
.sv_onexec = linux_on_exec_vmspace,
.sv_onexit = linux_on_exit,
.sv_ontdexit = linux_thread_dtor,

56
sys/arm64/linux/linux_sysvec.c
View File

@ -115,7 +115,6 @@ LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
/* DTrace probes */
LIN_SDT_PROBE_DEFINE0(sysvec, linux_exec_setregs, todo);
LIN_SDT_PROBE_DEFINE0(sysvec, linux_copyout_auxargs, todo);
LINUX_VDSO_SYM_CHAR(linux_platform);
LINUX_VDSO_SYM_INTPTR(kern_timekeep_base);
@ -162,55 +161,14 @@ linux_set_syscall_retval(struct thread *td, int error)
}
}
static int
linux_copyout_auxargs(struct image_params *imgp, uintptr_t base)
void
linux64_arch_copyout_auxargs(struct image_params *imgp, Elf_Auxinfo **pos)
{
Elf_Auxargs *args;
Elf_Auxinfo *argarray, *pos;
struct proc *p;
int error, issetugid;
LIN_SDT_PROBE0(sysvec, linux_copyout_auxargs, todo);
p = imgp->proc;
args = (Elf64_Auxargs *)imgp->auxargs;
argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,
M_WAITOK | M_ZERO);
issetugid = p->p_flag & P_SUGID ? 1 : 0;
AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, linux_vdso_base);
AUXARGS_ENTRY(pos, LINUX_AT_MINSIGSTKSZ, LINUX_MINSIGSTKSZ);
AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, *imgp->sysent->sv_hwcap);
AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
AUXARGS_ENTRY(pos, AT_BASE, args->base);
AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary);
AUXARGS_ENTRY(pos, LINUX_AT_HWCAP2, *imgp->sysent->sv_hwcap2);
if (imgp->execpathp != 0)
AUXARGS_ENTRY_PTR(pos, LINUX_AT_EXECFN, imgp->execpathp);
if (args->execfd != -1)
AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
AUXARGS_ENTRY(pos, AT_NULL, 0);
free(imgp->auxargs, M_TEMP);
imgp->auxargs = NULL;
KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs"));
error = copyout(argarray, (void *)base,
sizeof(*argarray) * LINUX_AT_COUNT);
free(argarray, M_TEMP);
return (error);
AUXARGS_ENTRY((*pos), LINUX_AT_SYSINFO_EHDR, linux_vdso_base);
AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP, *imgp->sysent->sv_hwcap);
AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP2, *imgp->sysent->sv_hwcap2);
AUXARGS_ENTRY((*pos), LINUX_AT_PLATFORM, PTROUT(linux_platform));
}
/*
@ -425,7 +383,7 @@ struct sysentvec elf_linux_sysvec = {
.sv_psstrings = LINUX_PS_STRINGS,
.sv_psstringssz = sizeof(struct ps_strings),
.sv_stackprot = VM_PROT_READ | VM_PROT_WRITE,
.sv_copyout_auxargs = linux_copyout_auxargs,
.sv_copyout_auxargs = __linuxN(copyout_auxargs),
.sv_copyout_strings = __linuxN(copyout_strings),
.sv_setregs = linux_exec_setregs,
.sv_fixlimit = NULL,

54
sys/compat/linux/linux_elf.c
View File

@ -488,3 +488,57 @@ linux_trans_osrel(const Elf_Note *note, int32_t *osrel)
return (true);
}
int
__linuxN(copyout_auxargs)(struct image_params *imgp, uintptr_t base)
{
Elf_Auxargs *args;
Elf_Auxinfo *aarray, *pos;
struct proc *p;
int error, issetugid;
p = imgp->proc;
issetugid = p->p_flag & P_SUGID ? 1 : 0;
args = imgp->auxargs;
aarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,
M_WAITOK | M_ZERO);
__linuxN(arch_copyout_auxargs)(imgp, &pos);
/*
* Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0,
* as it has appeared in the 2.4.0-rc7 first time.
* Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK),
* glibc falls back to the hard-coded CLK_TCK value when aux entry
* is not present.
* Also see linux_times() implementation.
*/
if (linux_kernver(curthread) >= LINUX_KERNVER_2004000)
AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
AUXARGS_ENTRY(pos, AT_BASE, args->base);
AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary);
if (imgp->execpathp != 0)
AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, PTROUT(imgp->execpathp));
if (args->execfd != -1)
AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
AUXARGS_ENTRY(pos, LINUX_AT_MINSIGSTKSZ, LINUX_MINSIGSTKSZ);
AUXARGS_ENTRY(pos, AT_NULL, 0);
free(imgp->auxargs, M_TEMP);
imgp->auxargs = NULL;
KASSERT(pos - aarray <= LINUX_AT_COUNT, ("Too many auxargs"));
error = copyout(aarray, PTRIN(base), sizeof(*aarray) * LINUX_AT_COUNT);
free(aarray, M_TEMP);
return (error);
}

2
sys/compat/linux/linux_elf.h
View File

@ -42,6 +42,8 @@ struct note_info_list;
void __linuxN(prepare_notes)(struct thread *, struct note_info_list *,
size_t *);
void __linuxN(arch_copyout_auxargs)(struct image_params *, Elf_Auxinfo **);
int __linuxN(copyout_auxargs)(struct image_params *, uintptr_t);
int __linuxN(copyout_strings)(struct image_params *, uintptr_t *);
bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel);

2
sys/i386/linux/linux.h
View File

@ -95,7 +95,7 @@ typedef struct {
/*
* Miscellaneous
*/
#define LINUX_AT_COUNT 20 /* Count of used aux entry types.
#define LINUX_AT_COUNT 21 /* Count of used aux entry types.
* Keep this synchronized with
* linux_fixup_elf() code.
*/

64
sys/i386/linux/linux_sysvec.c
View File

@ -138,60 +138,14 @@ linux_fixup(uintptr_t *stack_base, struct image_params *imgp)
return (0);
}
static int
linux_copyout_auxargs(struct image_params *imgp, uintptr_t base)
void
linux32_arch_copyout_auxargs(struct image_params *imgp, Elf_Auxinfo **pos)
{
Elf32_Auxargs *args;
Elf32_Auxinfo *argarray, *pos;
int error, issetugid;
issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0;
args = (Elf32_Auxargs *)imgp->auxargs;
argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,
M_WAITOK | M_ZERO);
AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, linux_vdso_base);
AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, __kernel_vsyscall);
AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
/*
* Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0,
* as it has appeared in the 2.4.0-rc7 first time.
* Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK),
* glibc falls back to the hard-coded CLK_TCK value when aux entry
* is not present.
* Also see linux_times() implementation.
*/
if (linux_kernver(curthread) >= LINUX_KERNVER_2004000)
AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
AUXARGS_ENTRY(pos, AT_BASE, args->base);
AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary);
if (imgp->execpathp != 0)
AUXARGS_ENTRY_PTR(pos, LINUX_AT_EXECFN, imgp->execpathp);
if (args->execfd != -1)
AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
AUXARGS_ENTRY(pos, AT_NULL, 0);
free(imgp->auxargs, M_TEMP);
imgp->auxargs = NULL;
KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs"));
error = copyout(argarray, (void *)base,
sizeof(*argarray) * LINUX_AT_COUNT);
free(argarray, M_TEMP);
return (error);
AUXARGS_ENTRY((*pos), LINUX_AT_SYSINFO_EHDR, linux_vdso_base);
AUXARGS_ENTRY((*pos), LINUX_AT_SYSINFO, __kernel_vsyscall);
AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP, cpu_feature);
AUXARGS_ENTRY((*pos), LINUX_AT_PLATFORM, PTROUT(linux_platform));
}
static void
@ -650,6 +604,8 @@ struct sysentvec linux_sysvec = {
.sv_schedtail = linux_schedtail,
.sv_thread_detach = linux_thread_detach,
.sv_trap = NULL,
.sv_hwcap = NULL,
.sv_hwcap2 = NULL,
.sv_onexec = linux_on_exec_vmspace,
.sv_onexit = linux_on_exit,
.sv_ontdexit = linux_thread_dtor,
@ -678,7 +634,7 @@ struct sysentvec elf_linux_sysvec = {
.sv_psstrings = LINUX_PS_STRINGS,
.sv_psstringssz = sizeof(struct ps_strings),
.sv_stackprot = VM_PROT_ALL,
.sv_copyout_auxargs = linux_copyout_auxargs,
.sv_copyout_auxargs = __linuxN(copyout_auxargs),
.sv_copyout_strings = __linuxN(copyout_strings),
.sv_setregs = linux_exec_setregs,
.sv_fixlimit = NULL,
@ -693,6 +649,8 @@ struct sysentvec elf_linux_sysvec = {
.sv_schedtail = linux_schedtail,
.sv_thread_detach = linux_thread_detach,
.sv_trap = NULL,
.sv_hwcap = NULL,
.sv_hwcap2 = NULL,
.sv_onexec = linux_on_exec_vmspace,
.sv_onexit = linux_on_exit,
.sv_ontdexit = linux_thread_dtor,