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- /*-
- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
- *
- * Copyright (c) 1994-1996 Søren Schmidt
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #include <sys/param.h>
- #include <sys/systm.h>
- #include <sys/exec.h>
- #include <sys/fcntl.h>
- #include <sys/imgact.h>
- #include <sys/imgact_aout.h>
- #include <sys/imgact_elf.h>
- #include <sys/kernel.h>
- #include <sys/lock.h>
- #include <sys/malloc.h>
- #include <sys/module.h>
- #include <sys/mutex.h>
- #include <sys/proc.h>
- #include <sys/signalvar.h>
- #include <sys/syscallsubr.h>
- #include <sys/sysctl.h>
- #include <sys/sysent.h>
- #include <sys/sysproto.h>
- #include <sys/vnode.h>
- #include <vm/vm.h>
- #include <vm/pmap.h>
- #include <vm/vm_extern.h>
- #include <vm/vm_map.h>
- #include <vm/vm_object.h>
- #include <vm/vm_page.h>
- #include <vm/vm_param.h>
- #include <machine/cpu.h>
- #include <machine/cputypes.h>
- #include <machine/md_var.h>
- #include <machine/pcb.h>
- #include <machine/trap.h>
- #include <i386/linux/linux.h>
- #include <i386/linux/linux_proto.h>
- #include <compat/linux/linux_emul.h>
- #include <compat/linux/linux_ioctl.h>
- #include <compat/linux/linux_mib.h>
- #include <compat/linux/linux_misc.h>
- #include <compat/linux/linux_signal.h>
- #include <compat/linux/linux_util.h>
- #include <compat/linux/linux_vdso.h>
- MODULE_VERSION(linux, 1);
- #define LINUX_PS_STRINGS (LINUX_USRSTACK - sizeof(struct ps_strings))
- static int linux_szsigcode;
- static vm_object_t linux_shared_page_obj;
- static char *linux_shared_page_mapping;
- extern char _binary_linux_locore_o_start;
- extern char _binary_linux_locore_o_end;
- extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
- SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
- static int linux_fixup(uintptr_t *stack_base,
- struct image_params *iparams);
- static int linux_fixup_elf(uintptr_t *stack_base,
- struct image_params *iparams);
- static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
- static void linux_exec_setregs(struct thread *td,
- struct image_params *imgp, uintptr_t stack);
- static int linux_copyout_strings(struct image_params *imgp,
- uintptr_t *stack_base);
- static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel);
- static void linux_vdso_install(void *param);
- static void linux_vdso_deinstall(void *param);
- static int linux_szplatform;
- const char *linux_kplatform;
- #define LINUX_T_UNKNOWN 255
- static int _bsd_to_linux_trapcode[] = {
- LINUX_T_UNKNOWN, /* 0 */
- 6, /* 1 T_PRIVINFLT */
- LINUX_T_UNKNOWN, /* 2 */
- 3, /* 3 T_BPTFLT */
- LINUX_T_UNKNOWN, /* 4 */
- LINUX_T_UNKNOWN, /* 5 */
- 16, /* 6 T_ARITHTRAP */
- 254, /* 7 T_ASTFLT */
- LINUX_T_UNKNOWN, /* 8 */
- 13, /* 9 T_PROTFLT */
- 1, /* 10 T_TRCTRAP */
- LINUX_T_UNKNOWN, /* 11 */
- 14, /* 12 T_PAGEFLT */
- LINUX_T_UNKNOWN, /* 13 */
- 17, /* 14 T_ALIGNFLT */
- LINUX_T_UNKNOWN, /* 15 */
- LINUX_T_UNKNOWN, /* 16 */
- LINUX_T_UNKNOWN, /* 17 */
- 0, /* 18 T_DIVIDE */
- 2, /* 19 T_NMI */
- 4, /* 20 T_OFLOW */
- 5, /* 21 T_BOUND */
- 7, /* 22 T_DNA */
- 8, /* 23 T_DOUBLEFLT */
- 9, /* 24 T_FPOPFLT */
- 10, /* 25 T_TSSFLT */
- 11, /* 26 T_SEGNPFLT */
- 12, /* 27 T_STKFLT */
- 18, /* 28 T_MCHK */
- 19, /* 29 T_XMMFLT */
- 15 /* 30 T_RESERVED */
- };
- #define bsd_to_linux_trapcode(code) \
- ((code)<nitems(_bsd_to_linux_trapcode)? \
- _bsd_to_linux_trapcode[(code)]: \
- LINUX_T_UNKNOWN)
- LINUX_VDSO_SYM_INTPTR(linux_sigcode);
- LINUX_VDSO_SYM_INTPTR(linux_rt_sigcode);
- LINUX_VDSO_SYM_INTPTR(linux_vsyscall);
- /*
- * If FreeBSD & Linux have a difference of opinion about what a trap
- * means, deal with it here.
- *
- * MPSAFE
- */
- static int
- linux_translate_traps(int signal, int trap_code)
- {
- if (signal != SIGBUS)
- return (signal);
- switch (trap_code) {
- case T_PROTFLT:
- case T_TSSFLT:
- case T_DOUBLEFLT:
- case T_PAGEFLT:
- return (SIGSEGV);
- default:
- return (signal);
- }
- }
- static int
- linux_fixup(uintptr_t *stack_base, struct image_params *imgp)
- {
- register_t *base, *argv, *envp;
- base = (register_t *)*stack_base;
- argv = base;
- envp = base + (imgp->args->argc + 1);
- base--;
- suword(base, (intptr_t)envp);
- base--;
- suword(base, (intptr_t)argv);
- base--;
- suword(base, imgp->args->argc);
- *stack_base = (uintptr_t)base;
- return (0);
- }
- static int
- linux_copyout_auxargs(struct image_params *imgp, uintptr_t base)
- {
- struct proc *p;
- Elf32_Auxargs *args;
- Elf32_Auxinfo *argarray, *pos;
- Elf32_Addr *uplatform;
- struct ps_strings *arginfo;
- int error, issetugid;
- p = imgp->proc;
- issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0;
- arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
- uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szplatform);
- 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,
- imgp->proc->p_sysent->sv_shared_page_base);
- AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, linux_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(uplatform));
- 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);
- }
- static int
- linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp)
- {
- register_t *base;
- base = (register_t *)*stack_base;
- base--;
- if (suword(base, (register_t)imgp->args->argc) == -1)
- return (EFAULT);
- *stack_base = (uintptr_t)base;
- return (0);
- }
- /*
- * Copied from kern/kern_exec.c
- */
- static int
- linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
- {
- int argc, envc, error;
- char **vectp;
- char *stringp;
- uintptr_t destp, ustringp;
- struct ps_strings *arginfo;
- char canary[LINUX_AT_RANDOM_LEN];
- size_t execpath_len;
- struct proc *p;
- /* Calculate string base and vector table pointers. */
- p = imgp->proc;
- if (imgp->execpath != NULL && imgp->auxargs != NULL)
- execpath_len = strlen(imgp->execpath) + 1;
- else
- execpath_len = 0;
- arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
- destp = (uintptr_t)arginfo;
- /* Install LINUX_PLATFORM. */
- destp -= linux_szplatform;
- destp = rounddown2(destp, sizeof(void *));
- error = copyout(linux_kplatform, (void *)destp, linux_szplatform);
- if (error != 0)
- return (error);
- if (execpath_len != 0) {
- destp -= execpath_len;
- destp = rounddown2(destp, sizeof(void *));
- imgp->execpathp = (void *)destp;
- error = copyout(imgp->execpath, imgp->execpathp, execpath_len);
- if (error != 0)
- return (error);
- }
- /* Prepare the canary for SSP. */
- arc4rand(canary, sizeof(canary), 0);
- destp -= roundup(sizeof(canary), sizeof(void *));
- imgp->canary = (void *)destp;
- error = copyout(canary, imgp->canary, sizeof(canary));
- if (error != 0)
- return (error);
- /* Allocate room for the argument and environment strings. */
- destp -= ARG_MAX - imgp->args->stringspace;
- destp = rounddown2(destp, sizeof(void *));
- ustringp = destp;
- if (imgp->auxargs) {
- /*
- * Allocate room on the stack for the ELF auxargs
- * array. It has LINUX_AT_COUNT entries.
- */
- destp -= LINUX_AT_COUNT * sizeof(Elf32_Auxinfo);
- destp = rounddown2(destp, sizeof(void *));
- }
- vectp = (char **)destp;
- /*
- * Allocate room for the argv[] and env vectors including the
- * terminating NULL pointers.
- */
- vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;
- /* vectp also becomes our initial stack base. */
- *stack_base = (uintptr_t)vectp;
- stringp = imgp->args->begin_argv;
- argc = imgp->args->argc;
- envc = imgp->args->envc;
- /* Copy out strings - arguments and environment. */
- error = copyout(stringp, (void *)ustringp,
- ARG_MAX - imgp->args->stringspace);
- if (error != 0)
- return (error);
- /* Fill in "ps_strings" struct for ps, w, etc. */
- if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 ||
- suword(&arginfo->ps_nargvstr, argc) != 0)
- return (EFAULT);
- /* Fill in argument portion of vector table. */
- for (; argc > 0; --argc) {
- if (suword(vectp++, ustringp) != 0)
- return (EFAULT);
- while (*stringp++ != 0)
- ustringp++;
- ustringp++;
- }
- /* A null vector table pointer separates the argp's from the envp's. */
- if (suword(vectp++, 0) != 0)
- return (EFAULT);
- if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 ||
- suword(&arginfo->ps_nenvstr, envc) != 0)
- return (EFAULT);
- /* Fill in environment portion of vector table. */
- for (; envc > 0; --envc) {
- if (suword(vectp++, ustringp) != 0)
- return (EFAULT);
- while (*stringp++ != 0)
- ustringp++;
- ustringp++;
- }
- /* The end of the vector table is a null pointer. */
- if (suword(vectp, 0) != 0)
- return (EFAULT);
- if (imgp->auxargs) {
- vectp++;
- error = imgp->sysent->sv_copyout_auxargs(imgp,
- (uintptr_t)vectp);
- if (error != 0)
- return (error);
- }
- return (0);
- }
- static void
- linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
- {
- struct thread *td = curthread;
- struct proc *p = td->td_proc;
- struct sigacts *psp;
- struct trapframe *regs;
- struct l_rt_sigframe *fp, frame;
- int sig, code;
- int oonstack;
- sig = ksi->ksi_signo;
- code = ksi->ksi_code;
- PROC_LOCK_ASSERT(p, MA_OWNED);
- psp = p->p_sigacts;
- mtx_assert(&psp->ps_mtx, MA_OWNED);
- regs = td->td_frame;
- oonstack = sigonstack(regs->tf_esp);
- /* Allocate space for the signal handler context. */
- if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
- SIGISMEMBER(psp->ps_sigonstack, sig)) {
- fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
- td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe));
- } else
- fp = (struct l_rt_sigframe *)regs->tf_esp - 1;
- mtx_unlock(&psp->ps_mtx);
- /* Build the argument list for the signal handler. */
- sig = bsd_to_linux_signal(sig);
- bzero(&frame, sizeof(frame));
- frame.sf_handler = catcher;
- frame.sf_sig = sig;
- frame.sf_siginfo = &fp->sf_si;
- frame.sf_ucontext = &fp->sf_sc;
- /* Fill in POSIX parts. */
- ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig);
- /* Build the signal context to be used by sigreturn. */
- frame.sf_sc.uc_flags = 0; /* XXX ??? */
- frame.sf_sc.uc_link = NULL; /* XXX ??? */
- frame.sf_sc.uc_stack.ss_sp = td->td_sigstk.ss_sp;
- frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
- frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
- ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
- PROC_UNLOCK(p);
- bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask);
- frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask;
- frame.sf_sc.uc_mcontext.sc_gs = rgs();
- frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs;
- frame.sf_sc.uc_mcontext.sc_es = regs->tf_es;
- frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds;
- frame.sf_sc.uc_mcontext.sc_edi = regs->tf_edi;
- frame.sf_sc.uc_mcontext.sc_esi = regs->tf_esi;
- frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_ebp;
- frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_ebx;
- frame.sf_sc.uc_mcontext.sc_esp = regs->tf_esp;
- frame.sf_sc.uc_mcontext.sc_edx = regs->tf_edx;
- frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_ecx;
- frame.sf_sc.uc_mcontext.sc_eax = regs->tf_eax;
- frame.sf_sc.uc_mcontext.sc_eip = regs->tf_eip;
- frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs;
- frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags;
- frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp;
- frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss;
- frame.sf_sc.uc_mcontext.sc_err = regs->tf_err;
- frame.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr;
- frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
- if (copyout(&frame, fp, sizeof(frame)) != 0) {
- /*
- * Process has trashed its stack; give it an illegal
- * instruction to halt it in its tracks.
- */
- PROC_LOCK(p);
- sigexit(td, SIGILL);
- }
- /* Build context to run handler in. */
- regs->tf_esp = (int)fp;
- regs->tf_eip = linux_rt_sigcode;
- regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D);
- regs->tf_cs = _ucodesel;
- regs->tf_ds = _udatasel;
- regs->tf_es = _udatasel;
- regs->tf_fs = _udatasel;
- regs->tf_ss = _udatasel;
- PROC_LOCK(p);
- mtx_lock(&psp->ps_mtx);
- }
- /*
- * Send an interrupt to process.
- *
- * Stack is set up to allow sigcode stored
- * in u. to call routine, followed by kcall
- * to sigreturn routine below. After sigreturn
- * resets the signal mask, the stack, and the
- * frame pointer, it returns to the user
- * specified pc, psl.
- */
- static void
- linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
- {
- struct thread *td = curthread;
- struct proc *p = td->td_proc;
- struct sigacts *psp;
- struct trapframe *regs;
- struct l_sigframe *fp, frame;
- l_sigset_t lmask;
- int sig, code;
- int oonstack;
- PROC_LOCK_ASSERT(p, MA_OWNED);
- psp = p->p_sigacts;
- sig = ksi->ksi_signo;
- code = ksi->ksi_code;
- mtx_assert(&psp->ps_mtx, MA_OWNED);
- if (SIGISMEMBER(psp->ps_siginfo, sig)) {
- /* Signal handler installed with SA_SIGINFO. */
- linux_rt_sendsig(catcher, ksi, mask);
- return;
- }
- regs = td->td_frame;
- oonstack = sigonstack(regs->tf_esp);
- /* Allocate space for the signal handler context. */
- if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
- SIGISMEMBER(psp->ps_sigonstack, sig)) {
- fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
- td->td_sigstk.ss_size - sizeof(struct l_sigframe));
- } else
- fp = (struct l_sigframe *)regs->tf_esp - 1;
- mtx_unlock(&psp->ps_mtx);
- PROC_UNLOCK(p);
- /* Build the argument list for the signal handler. */
- sig = bsd_to_linux_signal(sig);
- bzero(&frame, sizeof(frame));
- frame.sf_handler = catcher;
- frame.sf_sig = sig;
- bsd_to_linux_sigset(mask, &lmask);
- /* Build the signal context to be used by sigreturn. */
- frame.sf_sc.sc_mask = lmask.__mask;
- frame.sf_sc.sc_gs = rgs();
- frame.sf_sc.sc_fs = regs->tf_fs;
- frame.sf_sc.sc_es = regs->tf_es;
- frame.sf_sc.sc_ds = regs->tf_ds;
- frame.sf_sc.sc_edi = regs->tf_edi;
- frame.sf_sc.sc_esi = regs->tf_esi;
- frame.sf_sc.sc_ebp = regs->tf_ebp;
- frame.sf_sc.sc_ebx = regs->tf_ebx;
- frame.sf_sc.sc_esp = regs->tf_esp;
- frame.sf_sc.sc_edx = regs->tf_edx;
- frame.sf_sc.sc_ecx = regs->tf_ecx;
- frame.sf_sc.sc_eax = regs->tf_eax;
- frame.sf_sc.sc_eip = regs->tf_eip;
- frame.sf_sc.sc_cs = regs->tf_cs;
- frame.sf_sc.sc_eflags = regs->tf_eflags;
- frame.sf_sc.sc_esp_at_signal = regs->tf_esp;
- frame.sf_sc.sc_ss = regs->tf_ss;
- frame.sf_sc.sc_err = regs->tf_err;
- frame.sf_sc.sc_cr2 = (register_t)ksi->ksi_addr;
- frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno);
- frame.sf_extramask[0] = lmask.__mask;
- if (copyout(&frame, fp, sizeof(frame)) != 0) {
- /*
- * Process has trashed its stack; give it an illegal
- * instruction to halt it in its tracks.
- */
- PROC_LOCK(p);
- sigexit(td, SIGILL);
- }
- /* Build context to run handler in. */
- regs->tf_esp = (int)fp;
- regs->tf_eip = linux_sigcode;
- regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D);
- regs->tf_cs = _ucodesel;
- regs->tf_ds = _udatasel;
- regs->tf_es = _udatasel;
- regs->tf_fs = _udatasel;
- regs->tf_ss = _udatasel;
- PROC_LOCK(p);
- mtx_lock(&psp->ps_mtx);
- }
- /*
- * System call to cleanup state after a signal
- * has been taken. Reset signal mask and
- * stack state from context left by sendsig (above).
- * Return to previous pc and psl as specified by
- * context left by sendsig. Check carefully to
- * make sure that the user has not modified the
- * psl to gain improper privileges or to cause
- * a machine fault.
- */
- int
- linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args)
- {
- struct l_sigframe frame;
- struct trapframe *regs;
- l_sigset_t lmask;
- sigset_t bmask;
- int eflags;
- ksiginfo_t ksi;
- regs = td->td_frame;
- /*
- * The trampoline code hands us the sigframe.
- * It is unsafe to keep track of it ourselves, in the event that a
- * program jumps out of a signal handler.
- */
- if (copyin(args->sfp, &frame, sizeof(frame)) != 0)
- return (EFAULT);
- /* Check for security violations. */
- #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
- eflags = frame.sf_sc.sc_eflags;
- if (!EFLAGS_SECURE(eflags, regs->tf_eflags))
- return (EINVAL);
- /*
- * Don't allow users to load a valid privileged %cs. Let the
- * hardware check for invalid selectors, excess privilege in
- * other selectors, invalid %eip's and invalid %esp's.
- */
- #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
- if (!CS_SECURE(frame.sf_sc.sc_cs)) {
- ksiginfo_init_trap(&ksi);
- ksi.ksi_signo = SIGBUS;
- ksi.ksi_code = BUS_OBJERR;
- ksi.ksi_trapno = T_PROTFLT;
- ksi.ksi_addr = (void *)regs->tf_eip;
- trapsignal(td, &ksi);
- return (EINVAL);
- }
- lmask.__mask = frame.sf_sc.sc_mask;
- linux_to_bsd_sigset(&lmask, &bmask);
- kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
- /* Restore signal context. */
- /* %gs was restored by the trampoline. */
- regs->tf_fs = frame.sf_sc.sc_fs;
- regs->tf_es = frame.sf_sc.sc_es;
- regs->tf_ds = frame.sf_sc.sc_ds;
- regs->tf_edi = frame.sf_sc.sc_edi;
- regs->tf_esi = frame.sf_sc.sc_esi;
- regs->tf_ebp = frame.sf_sc.sc_ebp;
- regs->tf_ebx = frame.sf_sc.sc_ebx;
- regs->tf_edx = frame.sf_sc.sc_edx;
- regs->tf_ecx = frame.sf_sc.sc_ecx;
- regs->tf_eax = frame.sf_sc.sc_eax;
- regs->tf_eip = frame.sf_sc.sc_eip;
- regs->tf_cs = frame.sf_sc.sc_cs;
- regs->tf_eflags = eflags;
- regs->tf_esp = frame.sf_sc.sc_esp_at_signal;
- regs->tf_ss = frame.sf_sc.sc_ss;
- return (EJUSTRETURN);
- }
- /*
- * System call to cleanup state after a signal
- * has been taken. Reset signal mask and
- * stack state from context left by rt_sendsig (above).
- * Return to previous pc and psl as specified by
- * context left by sendsig. Check carefully to
- * make sure that the user has not modified the
- * psl to gain improper privileges or to cause
- * a machine fault.
- */
- int
- linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
- {
- struct l_ucontext uc;
- struct l_sigcontext *context;
- sigset_t bmask;
- l_stack_t *lss;
- stack_t ss;
- struct trapframe *regs;
- int eflags;
- ksiginfo_t ksi;
- regs = td->td_frame;
- /*
- * The trampoline code hands us the ucontext.
- * It is unsafe to keep track of it ourselves, in the event that a
- * program jumps out of a signal handler.
- */
- if (copyin(args->ucp, &uc, sizeof(uc)) != 0)
- return (EFAULT);
- context = &uc.uc_mcontext;
- /* Check for security violations. */
- #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
- eflags = context->sc_eflags;
- if (!EFLAGS_SECURE(eflags, regs->tf_eflags))
- return (EINVAL);
- /*
- * Don't allow users to load a valid privileged %cs. Let the
- * hardware check for invalid selectors, excess privilege in
- * other selectors, invalid %eip's and invalid %esp's.
- */
- #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
- if (!CS_SECURE(context->sc_cs)) {
- ksiginfo_init_trap(&ksi);
- ksi.ksi_signo = SIGBUS;
- ksi.ksi_code = BUS_OBJERR;
- ksi.ksi_trapno = T_PROTFLT;
- ksi.ksi_addr = (void *)regs->tf_eip;
- trapsignal(td, &ksi);
- return (EINVAL);
- }
- linux_to_bsd_sigset(&uc.uc_sigmask, &bmask);
- kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
- /* Restore signal context. */
- /* %gs was restored by the trampoline. */
- regs->tf_fs = context->sc_fs;
- regs->tf_es = context->sc_es;
- regs->tf_ds = context->sc_ds;
- regs->tf_edi = context->sc_edi;
- regs->tf_esi = context->sc_esi;
- regs->tf_ebp = context->sc_ebp;
- regs->tf_ebx = context->sc_ebx;
- regs->tf_edx = context->sc_edx;
- regs->tf_ecx = context->sc_ecx;
- regs->tf_eax = context->sc_eax;
- regs->tf_eip = context->sc_eip;
- regs->tf_cs = context->sc_cs;
- regs->tf_eflags = eflags;
- regs->tf_esp = context->sc_esp_at_signal;
- regs->tf_ss = context->sc_ss;
- /* Call sigaltstack & ignore results. */
- lss = &uc.uc_stack;
- ss.ss_sp = lss->ss_sp;
- ss.ss_size = lss->ss_size;
- ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags);
- (void)kern_sigaltstack(td, &ss, NULL);
- return (EJUSTRETURN);
- }
- static int
- linux_fetch_syscall_args(struct thread *td)
- {
- struct proc *p;
- struct trapframe *frame;
- struct syscall_args *sa;
- p = td->td_proc;
- frame = td->td_frame;
- sa = &td->td_sa;
- sa->code = frame->tf_eax;
- sa->args[0] = frame->tf_ebx;
- sa->args[1] = frame->tf_ecx;
- sa->args[2] = frame->tf_edx;
- sa->args[3] = frame->tf_esi;
- sa->args[4] = frame->tf_edi;
- sa->args[5] = frame->tf_ebp; /* Unconfirmed */
- if (sa->code >= p->p_sysent->sv_size)
- /* nosys */
- sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1];
- else
- sa->callp = &p->p_sysent->sv_table[sa->code];
- td->td_retval[0] = 0;
- td->td_retval[1] = frame->tf_edx;
- return (0);
- }
- static void
- linux_set_syscall_retval(struct thread *td, int error)
- {
- struct trapframe *frame = td->td_frame;
- cpu_set_syscall_retval(td, error);
- if (__predict_false(error != 0)) {
- if (error != ERESTART && error != EJUSTRETURN)
- frame->tf_eax = bsd_to_linux_errno(error);
- }
- }
- /*
- * exec_setregs may initialize some registers differently than Linux
- * does, thus potentially confusing Linux binaries. If necessary, we
- * override the exec_setregs default(s) here.
- */
- static void
- linux_exec_setregs(struct thread *td, struct image_params *imgp,
- uintptr_t stack)
- {
- struct pcb *pcb = td->td_pcb;
- exec_setregs(td, imgp, stack);
- /* Linux sets %gs to 0, we default to _udatasel. */
- pcb->pcb_gs = 0;
- load_gs(0);
- pcb->pcb_initial_npxcw = __LINUX_NPXCW__;
- }
- static void
- linux_get_machine(const char **dst)
- {
- switch (cpu_class) {
- case CPUCLASS_686:
- *dst = "i686";
- break;
- case CPUCLASS_586:
- *dst = "i586";
- break;
- case CPUCLASS_486:
- *dst = "i486";
- break;
- default:
- *dst = "i386";
- }
- }
- struct sysentvec linux_sysvec = {
- .sv_size = LINUX_SYS_MAXSYSCALL,
- .sv_table = linux_sysent,
- .sv_transtrap = linux_translate_traps,
- .sv_fixup = linux_fixup,
- .sv_sendsig = linux_sendsig,
- .sv_sigcode = &_binary_linux_locore_o_start,
- .sv_szsigcode = &linux_szsigcode,
- .sv_name = "Linux a.out",
- .sv_coredump = NULL,
- .sv_imgact_try = linux_exec_imgact_try,
- .sv_minsigstksz = LINUX_MINSIGSTKSZ,
- .sv_minuser = VM_MIN_ADDRESS,
- .sv_maxuser = VM_MAXUSER_ADDRESS,
- .sv_usrstack = LINUX_USRSTACK,
- .sv_psstrings = PS_STRINGS,
- .sv_stackprot = VM_PROT_ALL,
- .sv_copyout_strings = exec_copyout_strings,
- .sv_setregs = linux_exec_setregs,
- .sv_fixlimit = NULL,
- .sv_maxssiz = NULL,
- .sv_flags = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32,
- .sv_set_syscall_retval = linux_set_syscall_retval,
- .sv_fetch_syscall_args = linux_fetch_syscall_args,
- .sv_syscallnames = NULL,
- .sv_shared_page_base = LINUX_SHAREDPAGE,
- .sv_shared_page_len = PAGE_SIZE,
- .sv_schedtail = linux_schedtail,
- .sv_thread_detach = linux_thread_detach,
- .sv_trap = NULL,
- .sv_onexec = linux_on_exec,
- .sv_onexit = linux_on_exit,
- .sv_ontdexit = linux_thread_dtor,
- };
- INIT_SYSENTVEC(aout_sysvec, &linux_sysvec);
- struct sysentvec elf_linux_sysvec = {
- .sv_size = LINUX_SYS_MAXSYSCALL,
- .sv_table = linux_sysent,
- .sv_transtrap = linux_translate_traps,
- .sv_fixup = linux_fixup_elf,
- .sv_sendsig = linux_sendsig,
- .sv_sigcode = &_binary_linux_locore_o_start,
- .sv_szsigcode = &linux_szsigcode,
- .sv_name = "Linux ELF32",
- .sv_coredump = elf32_coredump,
- .sv_imgact_try = linux_exec_imgact_try,
- .sv_minsigstksz = LINUX_MINSIGSTKSZ,
- .sv_minuser = VM_MIN_ADDRESS,
- .sv_maxuser = VM_MAXUSER_ADDRESS,
- .sv_usrstack = LINUX_USRSTACK,
- .sv_psstrings = LINUX_PS_STRINGS,
- .sv_stackprot = VM_PROT_ALL,
- .sv_copyout_auxargs = linux_copyout_auxargs,
- .sv_copyout_strings = linux_copyout_strings,
- .sv_setregs = linux_exec_setregs,
- .sv_fixlimit = NULL,
- .sv_maxssiz = NULL,
- .sv_flags = SV_ABI_LINUX | SV_IA32 | SV_ILP32 | SV_SHP,
- .sv_set_syscall_retval = linux_set_syscall_retval,
- .sv_fetch_syscall_args = linux_fetch_syscall_args,
- .sv_syscallnames = NULL,
- .sv_shared_page_base = LINUX_SHAREDPAGE,
- .sv_shared_page_len = PAGE_SIZE,
- .sv_schedtail = linux_schedtail,
- .sv_thread_detach = linux_thread_detach,
- .sv_trap = NULL,
- .sv_onexec = linux_on_exec,
- .sv_onexit = linux_on_exit,
- .sv_ontdexit = linux_thread_dtor,
- };
- static void
- linux_vdso_install(void *param)
- {
- linux_szsigcode = (&_binary_linux_locore_o_end -
- &_binary_linux_locore_o_start);
- if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len)
- panic("Linux invalid vdso size\n");
- __elfN(linux_vdso_fixup)(&elf_linux_sysvec);
- linux_shared_page_obj = __elfN(linux_shared_page_init)
- (&linux_shared_page_mapping);
- __elfN(linux_vdso_reloc)(&elf_linux_sysvec);
- bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping,
- linux_szsigcode);
- elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj;
- }
- SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY,
- linux_vdso_install, NULL);
- static void
- linux_vdso_deinstall(void *param)
- {
- __elfN(linux_shared_page_fini)(linux_shared_page_obj);
- }
- SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
- linux_vdso_deinstall, NULL);
- static char GNU_ABI_VENDOR[] = "GNU";
- static int GNULINUX_ABI_DESC = 0;
- static bool
- linux_trans_osrel(const Elf_Note *note, int32_t *osrel)
- {
- const Elf32_Word *desc;
- uintptr_t p;
- p = (uintptr_t)(note + 1);
- p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
- desc = (const Elf32_Word *)p;
- if (desc[0] != GNULINUX_ABI_DESC)
- return (false);
- /*
- * For Linux we encode osrel using the Linux convention of
- * (version << 16) | (major << 8) | (minor)
- * See macro in linux_mib.h
- */
- *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]);
- return (true);
- }
- static Elf_Brandnote linux_brandnote = {
- .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
- .hdr.n_descsz = 16, /* XXX at least 16 */
- .hdr.n_type = 1,
- .vendor = GNU_ABI_VENDOR,
- .flags = BN_TRANSLATE_OSREL,
- .trans_osrel = linux_trans_osrel
- };
- static Elf32_Brandinfo linux_brand = {
- .brand = ELFOSABI_LINUX,
- .machine = EM_386,
- .compat_3_brand = "Linux",
- .emul_path = linux_emul_path,
- .interp_path = "/lib/ld-linux.so.1",
- .sysvec = &elf_linux_sysvec,
- .interp_newpath = NULL,
- .brand_note = &linux_brandnote,
- .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
- };
- static Elf32_Brandinfo linux_glibc2brand = {
- .brand = ELFOSABI_LINUX,
- .machine = EM_386,
- .compat_3_brand = "Linux",
- .emul_path = linux_emul_path,
- .interp_path = "/lib/ld-linux.so.2",
- .sysvec = &elf_linux_sysvec,
- .interp_newpath = NULL,
- .brand_note = &linux_brandnote,
- .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
- };
- static Elf32_Brandinfo linux_muslbrand = {
- .brand = ELFOSABI_LINUX,
- .machine = EM_386,
- .compat_3_brand = "Linux",
- .emul_path = linux_emul_path,
- .interp_path = "/lib/ld-musl-i386.so.1",
- .sysvec = &elf_linux_sysvec,
- .interp_newpath = NULL,
- .brand_note = &linux_brandnote,
- .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
- };
- Elf32_Brandinfo *linux_brandlist[] = {
- &linux_brand,
- &linux_glibc2brand,
- &linux_muslbrand,
- NULL
- };
- static int
- linux_elf_modevent(module_t mod, int type, void *data)
- {
- Elf32_Brandinfo **brandinfo;
- int error;
- struct linux_ioctl_handler **lihp;
- error = 0;
- switch(type) {
- case MOD_LOAD:
- for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
- ++brandinfo)
- if (elf32_insert_brand_entry(*brandinfo) < 0)
- error = EINVAL;
- if (error == 0) {
- SET_FOREACH(lihp, linux_ioctl_handler_set)
- linux_ioctl_register_handler(*lihp);
- LIST_INIT(&futex_list);
- mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF);
- linux_get_machine(&linux_kplatform);
- linux_szplatform = roundup(strlen(linux_kplatform) + 1,
- sizeof(char *));
- linux_dev_shm_create();
- linux_osd_jail_register();
- stclohz = (stathz ? stathz : hz);
- if (bootverbose)
- printf("Linux ELF exec handler installed\n");
- } else
- printf("cannot insert Linux ELF brand handler\n");
- break;
- case MOD_UNLOAD:
- for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
- ++brandinfo)
- if (elf32_brand_inuse(*brandinfo))
- error = EBUSY;
- if (error == 0) {
- for (brandinfo = &linux_brandlist[0];
- *brandinfo != NULL; ++brandinfo)
- if (elf32_remove_brand_entry(*brandinfo) < 0)
- error = EINVAL;
- }
- if (error == 0) {
- SET_FOREACH(lihp, linux_ioctl_handler_set)
- linux_ioctl_unregister_handler(*lihp);
- mtx_destroy(&futex_mtx);
- linux_dev_shm_destroy();
- linux_osd_jail_deregister();
- if (bootverbose)
- printf("Linux ELF exec handler removed\n");
- } else
- printf("Could not deinstall ELF interpreter entry\n");
- break;
- default:
- return (EOPNOTSUPP);
- }
- return (error);
- }
- static moduledata_t linux_elf_mod = {
- "linuxelf",
- linux_elf_modevent,
- 0
- };
- DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
- FEATURE(linux, "Linux 32bit support");
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