Differential D22401 Diff 64541 head/sys/amd64/linux/linux_sysvec.c

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head/sys/amd64/linux/linux_sysvec.c

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static char *linux_shared_page_mapping;		static char *linux_shared_page_mapping;
extern char _binary_linux_locore_o_start;		extern char _binary_linux_locore_o_start;
extern char _binary_linux_locore_o_end;		extern char _binary_linux_locore_o_end;

extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];		extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];

SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);		SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);

static register_t * linux_copyout_strings(struct image_params *imgp);		static int linux_copyout_strings(struct image_params *imgp,
		register_t **stack_base);
static int linux_fixup_elf(register_t **stack_base,		static int linux_fixup_elf(register_t **stack_base,
struct image_params *iparams);		struct image_params *iparams);
static bool linux_trans_osrel(const Elf_Note note, int32_t osrel);		static bool linux_trans_osrel(const Elf_Note note, int32_t osrel);
static void linux_vdso_install(void *param);		static void linux_vdso_install(void *param);
static void linux_vdso_deinstall(void *param);		static void linux_vdso_deinstall(void *param);
static void linux_set_syscall_retval(struct thread *td, int error);		static void linux_set_syscall_retval(struct thread *td, int error);
static int linux_fetch_syscall_args(struct thread *td);		static int linux_fetch_syscall_args(struct thread *td);
static void linux_exec_setregs(struct thread td, struct image_params imgp,		static void linux_exec_setregs(struct thread td, struct image_params imgp,
▲ Show 20 Lines • Show All 109 Lines • ▼ Show 20 Lines	if (error != EJUSTRETURN)
frame->tf_r10 = frame->tf_rcx;		frame->tf_r10 = frame->tf_rcx;

cpu_set_syscall_retval(td, error);		cpu_set_syscall_retval(td, error);

/* Restore all registers. */		/* Restore all registers. */
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);		set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
}		}

static void		static int
linux_copyout_auxargs(struct image_params imgp, u_long base)		linux_copyout_auxargs(struct image_params imgp, u_long base)
{		{
Elf_Auxargs *args;		Elf_Auxargs *args;
Elf_Auxinfo argarray, pos;		Elf_Auxinfo argarray, pos;
u_long auxlen;		u_long auxlen;
struct proc *p;		struct proc *p;
int issetugid;		int error, issetugid;

p = imgp->proc;		p = imgp->proc;
args = (Elf64_Auxargs *)imgp->auxargs;		args = (Elf64_Auxargs *)imgp->auxargs;
argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,		argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,
M_WAITOK \| M_ZERO);		M_WAITOK \| M_ZERO);

issetugid = p->p_flag & P_SUGID ? 1 : 0;		issetugid = p->p_flag & P_SUGID ? 1 : 0;
AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR,		AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR,
Show All 21 Lines	linux_copyout_auxargs(struct image_params imgp, u_long base)
AUXARGS_ENTRY(pos, AT_NULL, 0);		AUXARGS_ENTRY(pos, AT_NULL, 0);

free(imgp->auxargs, M_TEMP);		free(imgp->auxargs, M_TEMP);
imgp->auxargs = NULL;		imgp->auxargs = NULL;
KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs"));		KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs"));

auxlen = sizeof(argarray) (pos - argarray);		auxlen = sizeof(argarray) (pos - argarray);
*base -= auxlen;		*base -= auxlen;
copyout(argarray, (void )base, auxlen);		error = copyout(argarray, (void )base, auxlen);
free(argarray, M_TEMP);		free(argarray, M_TEMP);
		return (error);
}		}

static int		static int
linux_fixup_elf(register_t *stack_base, struct image_params imgp)		linux_fixup_elf(register_t *stack_base, struct image_params imgp)
{		{
Elf_Addr *base;		Elf_Addr *base;

base = (Elf64_Addr )stack_base;		base = (Elf64_Addr )stack_base;
base--;		base--;
if (suword(base, (uint64_t)imgp->args->argc) == -1)		if (suword(base, (uint64_t)imgp->args->argc) == -1)
return (EFAULT);		return (EFAULT);

stack_base = (register_t )base;		stack_base = (register_t )base;
return (0);		return (0);
}		}

/*		/*
* Copy strings out to the new process address space, constructing new arg		* Copy strings out to the new process address space, constructing new arg
* and env vector tables. Return a pointer to the base so that it can be used		* and env vector tables. Return a pointer to the base so that it can be used
* as the initial stack pointer.		* as the initial stack pointer.
*/		*/
static register_t *		static int
linux_copyout_strings(struct image_params *imgp)		linux_copyout_strings(struct image_params imgp, register_t *stack_base)
{		{
int argc, envc;		int argc, envc, error;
char **vectp;		char **vectp;
char stringp, destp;		char stringp, destp;
register_t *stack_base;
struct ps_strings *arginfo;		struct ps_strings *arginfo;
char canary[LINUX_AT_RANDOM_LEN];		char canary[LINUX_AT_RANDOM_LEN];
size_t execpath_len;		size_t execpath_len;
struct proc *p;		struct proc *p;

/* Calculate string base and vector table pointers. */		/* Calculate string base and vector table pointers. */
if (imgp->execpath != NULL && imgp->auxargs != NULL)		if (imgp->execpath != NULL && imgp->auxargs != NULL)
execpath_len = strlen(imgp->execpath) + 1;		execpath_len = strlen(imgp->execpath) + 1;
else		else
execpath_len = 0;		execpath_len = 0;

p = imgp->proc;		p = imgp->proc;
arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;		arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
destp = (caddr_t)arginfo - SPARE_USRSPACE -		destp = (caddr_t)arginfo - SPARE_USRSPACE -
roundup(sizeof(canary), sizeof(char *)) -		roundup(sizeof(canary), sizeof(char *)) -
roundup(execpath_len, sizeof(char *)) -		roundup(execpath_len, sizeof(char *)) -
roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *));		roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *));

if (execpath_len != 0) {		if (execpath_len != 0) {
imgp->execpathp = (uintptr_t)arginfo - execpath_len;		imgp->execpathp = (uintptr_t)arginfo - execpath_len;
copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len);		error = copyout(imgp->execpath, (void *)imgp->execpathp,
		execpath_len);
		if (error != 0)
		return (error);
}		}

/* Prepare the canary for SSP. */		/* Prepare the canary for SSP. */
arc4rand(canary, sizeof(canary), 0);		arc4rand(canary, sizeof(canary), 0);
imgp->canary = (uintptr_t)arginfo -		imgp->canary = (uintptr_t)arginfo -
roundup(execpath_len, sizeof(char *)) -		roundup(execpath_len, sizeof(char *)) -
roundup(sizeof(canary), sizeof(char *));		roundup(sizeof(canary), sizeof(char *));
copyout(canary, (void *)imgp->canary, sizeof(canary));		error = copyout(canary, (void *)imgp->canary, sizeof(canary));
		if (error != 0)
		return (error);

vectp = (char **)destp;		vectp = (char **)destp;

/*		/*
* Starting with 2.24, glibc depends on a 16-byte stack alignment.		* Starting with 2.24, glibc depends on a 16-byte stack alignment.
* One "long argc" will be prepended later.		* One "long argc" will be prepended later.
*/		*/
vectp = (char **)((((uintptr_t)vectp + 8) & ~0xF) - 8);		vectp = (char **)((((uintptr_t)vectp + 8) & ~0xF) - 8);

if (imgp->auxargs)		if (imgp->auxargs) {
imgp->sysent->sv_copyout_auxargs(imgp, (u_long *)&vectp);		error = imgp->sysent->sv_copyout_auxargs(imgp,
		(u_long *)&vectp);
		if (error != 0)
		return (error);
		}

/*		/*
* Allocate room for the argv[] and env vectors including the		* Allocate room for the argv[] and env vectors including the
* terminating NULL pointers.		* terminating NULL pointers.
*/		*/
vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;		vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;

/* vectp also becomes our initial stack base. */		/* vectp also becomes our initial stack base. */
stack_base = (register_t *)vectp;		stack_base = (register_t )vectp;

stringp = imgp->args->begin_argv;		stringp = imgp->args->begin_argv;
argc = imgp->args->argc;		argc = imgp->args->argc;
envc = imgp->args->envc;		envc = imgp->args->envc;

/* Copy out strings - arguments and environment. */		/* Copy out strings - arguments and environment. */
copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);		error = copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
		if (error != 0)
		return (error);

/* Fill in "ps_strings" struct for ps, w, etc. */		/* Fill in "ps_strings" struct for ps, w, etc. */
suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp);		if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 \|\|
suword(&arginfo->ps_nargvstr, argc);		suword(&arginfo->ps_nargvstr, argc) != 0)
		return (EFAULT);

/* Fill in argument portion of vector table. */		/* Fill in argument portion of vector table. */
for (; argc > 0; --argc) {		for (; argc > 0; --argc) {
suword(vectp++, (long)(intptr_t)destp);		if (suword(vectp++, (long)(intptr_t)destp) != 0)
		return (EFAULT);
while (*stringp++ != 0)		while (*stringp++ != 0)
destp++;		destp++;
destp++;		destp++;
}		}

/* A null vector table pointer separates the argp's from the envp's. */		/* A null vector table pointer separates the argp's from the envp's. */
suword(vectp++, 0);		if (suword(vectp++, 0) != 0)
		return (EFAULT);

suword(&arginfo->ps_envstr, (long)(intptr_t)vectp);		if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 \|\|
suword(&arginfo->ps_nenvstr, envc);		suword(&arginfo->ps_nenvstr, envc) != 0)
		return (EFAULT);

/* Fill in environment portion of vector table. */		/* Fill in environment portion of vector table. */
for (; envc > 0; --envc) {		for (; envc > 0; --envc) {
suword(vectp++, (long)(intptr_t)destp);		if (suword(vectp++, (long)(intptr_t)destp) != 0)
		return (EFAULT);
while (*stringp++ != 0)		while (*stringp++ != 0)
destp++;		destp++;
destp++;		destp++;
}		}

/* The end of the vector table is a null pointer. */		/* The end of the vector table is a null pointer. */
suword(vectp, 0);		if (suword(vectp, 0) != 0)
return (stack_base);		return (EFAULT);

		return (0);
}		}

/*		/*
* Reset registers to default values on exec.		* Reset registers to default values on exec.
*/		*/
static void		static void
linux_exec_setregs(struct thread td, struct image_params imgp, u_long stack)		linux_exec_setregs(struct thread td, struct image_params imgp, u_long stack)
{		{
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