v4.19.13 snapshot.
diff --git a/arch/x86/ia32/Makefile b/arch/x86/ia32/Makefile
new file mode 100644
index 0000000..cd4339b
--- /dev/null
+++ b/arch/x86/ia32/Makefile
@@ -0,0 +1,10 @@
+#
+# Makefile for the ia32 kernel emulation subsystem.
+#
+
+obj-$(CONFIG_IA32_EMULATION) := sys_ia32.o ia32_signal.o
+
+obj-$(CONFIG_IA32_AOUT) += ia32_aout.o
+
+audit-class-$(CONFIG_AUDIT) := audit.o
+obj-$(CONFIG_IA32_EMULATION) += $(audit-class-y)
diff --git a/arch/x86/ia32/audit.c b/arch/x86/ia32/audit.c
new file mode 100644
index 0000000..3d21eab
--- /dev/null
+++ b/arch/x86/ia32/audit.c
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <asm/unistd_32.h>
+
+unsigned ia32_dir_class[] = {
+#include <asm-generic/audit_dir_write.h>
+~0U
+};
+
+unsigned ia32_chattr_class[] = {
+#include <asm-generic/audit_change_attr.h>
+~0U
+};
+
+unsigned ia32_write_class[] = {
+#include <asm-generic/audit_write.h>
+~0U
+};
+
+unsigned ia32_read_class[] = {
+#include <asm-generic/audit_read.h>
+~0U
+};
+
+unsigned ia32_signal_class[] = {
+#include <asm-generic/audit_signal.h>
+~0U
+};
+
+int ia32_classify_syscall(unsigned syscall)
+{
+ switch (syscall) {
+ case __NR_open:
+ return 2;
+ case __NR_openat:
+ return 3;
+ case __NR_socketcall:
+ return 4;
+ case __NR_execve:
+ case __NR_execveat:
+ return 5;
+ default:
+ return 1;
+ }
+}
diff --git a/arch/x86/ia32/ia32_aout.c b/arch/x86/ia32/ia32_aout.c
new file mode 100644
index 0000000..8e02b30
--- /dev/null
+++ b/arch/x86/ia32/ia32_aout.c
@@ -0,0 +1,487 @@
+/*
+ * a.out loader for x86-64
+ *
+ * Copyright (C) 1991, 1992, 1996 Linus Torvalds
+ * Hacked together by Andi Kleen
+ */
+
+#include <linux/module.h>
+
+#include <linux/time.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/a.out.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/stat.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/binfmts.h>
+#include <linux/personality.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/perf_event.h>
+#include <linux/sched/task_stack.h>
+
+#include <linux/uaccess.h>
+#include <asm/pgalloc.h>
+#include <asm/cacheflush.h>
+#include <asm/user32.h>
+#include <asm/ia32.h>
+
+#undef WARN_OLD
+
+static int load_aout_binary(struct linux_binprm *);
+static int load_aout_library(struct file *);
+
+#ifdef CONFIG_COREDUMP
+static int aout_core_dump(struct coredump_params *);
+
+static unsigned long get_dr(int n)
+{
+ struct perf_event *bp = current->thread.ptrace_bps[n];
+ return bp ? bp->hw.info.address : 0;
+}
+
+/*
+ * fill in the user structure for a core dump..
+ */
+static void dump_thread32(struct pt_regs *regs, struct user32 *dump)
+{
+ u32 fs, gs;
+ memset(dump, 0, sizeof(*dump));
+
+/* changed the size calculations - should hopefully work better. lbt */
+ dump->magic = CMAGIC;
+ dump->start_code = 0;
+ dump->start_stack = regs->sp & ~(PAGE_SIZE - 1);
+ dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
+ dump->u_dsize = ((unsigned long)
+ (current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT;
+ dump->u_dsize -= dump->u_tsize;
+ dump->u_debugreg[0] = get_dr(0);
+ dump->u_debugreg[1] = get_dr(1);
+ dump->u_debugreg[2] = get_dr(2);
+ dump->u_debugreg[3] = get_dr(3);
+ dump->u_debugreg[6] = current->thread.debugreg6;
+ dump->u_debugreg[7] = current->thread.ptrace_dr7;
+
+ if (dump->start_stack < 0xc0000000) {
+ unsigned long tmp;
+
+ tmp = (unsigned long) (0xc0000000 - dump->start_stack);
+ dump->u_ssize = tmp >> PAGE_SHIFT;
+ }
+
+ dump->regs.ebx = regs->bx;
+ dump->regs.ecx = regs->cx;
+ dump->regs.edx = regs->dx;
+ dump->regs.esi = regs->si;
+ dump->regs.edi = regs->di;
+ dump->regs.ebp = regs->bp;
+ dump->regs.eax = regs->ax;
+ dump->regs.ds = current->thread.ds;
+ dump->regs.es = current->thread.es;
+ savesegment(fs, fs);
+ dump->regs.fs = fs;
+ savesegment(gs, gs);
+ dump->regs.gs = gs;
+ dump->regs.orig_eax = regs->orig_ax;
+ dump->regs.eip = regs->ip;
+ dump->regs.cs = regs->cs;
+ dump->regs.eflags = regs->flags;
+ dump->regs.esp = regs->sp;
+ dump->regs.ss = regs->ss;
+
+#if 1 /* FIXME */
+ dump->u_fpvalid = 0;
+#else
+ dump->u_fpvalid = dump_fpu(regs, &dump->i387);
+#endif
+}
+
+#endif
+
+static struct linux_binfmt aout_format = {
+ .module = THIS_MODULE,
+ .load_binary = load_aout_binary,
+ .load_shlib = load_aout_library,
+#ifdef CONFIG_COREDUMP
+ .core_dump = aout_core_dump,
+#endif
+ .min_coredump = PAGE_SIZE
+};
+
+static int set_brk(unsigned long start, unsigned long end)
+{
+ start = PAGE_ALIGN(start);
+ end = PAGE_ALIGN(end);
+ if (end <= start)
+ return 0;
+ return vm_brk(start, end - start);
+}
+
+#ifdef CONFIG_COREDUMP
+/*
+ * These are the only things you should do on a core-file: use only these
+ * macros to write out all the necessary info.
+ */
+
+#include <linux/coredump.h>
+
+#define START_DATA(u) (u.u_tsize << PAGE_SHIFT)
+#define START_STACK(u) (u.start_stack)
+
+/*
+ * Routine writes a core dump image in the current directory.
+ * Currently only a stub-function.
+ *
+ * Note that setuid/setgid files won't make a core-dump if the uid/gid
+ * changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable"
+ * field, which also makes sure the core-dumps won't be recursive if the
+ * dumping of the process results in another error..
+ */
+
+static int aout_core_dump(struct coredump_params *cprm)
+{
+ mm_segment_t fs;
+ int has_dumped = 0;
+ unsigned long dump_start, dump_size;
+ struct user32 dump;
+
+ fs = get_fs();
+ set_fs(KERNEL_DS);
+ has_dumped = 1;
+ strncpy(dump.u_comm, current->comm, sizeof(current->comm));
+ dump.u_ar0 = offsetof(struct user32, regs);
+ dump.signal = cprm->siginfo->si_signo;
+ dump_thread32(cprm->regs, &dump);
+
+ /*
+ * If the size of the dump file exceeds the rlimit, then see
+ * what would happen if we wrote the stack, but not the data
+ * area.
+ */
+ if ((dump.u_dsize + dump.u_ssize + 1) * PAGE_SIZE > cprm->limit)
+ dump.u_dsize = 0;
+
+ /* Make sure we have enough room to write the stack and data areas. */
+ if ((dump.u_ssize + 1) * PAGE_SIZE > cprm->limit)
+ dump.u_ssize = 0;
+
+ /* make sure we actually have a data and stack area to dump */
+ set_fs(USER_DS);
+ if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_DATA(dump),
+ dump.u_dsize << PAGE_SHIFT))
+ dump.u_dsize = 0;
+ if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_STACK(dump),
+ dump.u_ssize << PAGE_SHIFT))
+ dump.u_ssize = 0;
+
+ set_fs(KERNEL_DS);
+ /* struct user */
+ if (!dump_emit(cprm, &dump, sizeof(dump)))
+ goto end_coredump;
+ /* Now dump all of the user data. Include malloced stuff as well */
+ if (!dump_skip(cprm, PAGE_SIZE - sizeof(dump)))
+ goto end_coredump;
+ /* now we start writing out the user space info */
+ set_fs(USER_DS);
+ /* Dump the data area */
+ if (dump.u_dsize != 0) {
+ dump_start = START_DATA(dump);
+ dump_size = dump.u_dsize << PAGE_SHIFT;
+ if (!dump_emit(cprm, (void *)dump_start, dump_size))
+ goto end_coredump;
+ }
+ /* Now prepare to dump the stack area */
+ if (dump.u_ssize != 0) {
+ dump_start = START_STACK(dump);
+ dump_size = dump.u_ssize << PAGE_SHIFT;
+ if (!dump_emit(cprm, (void *)dump_start, dump_size))
+ goto end_coredump;
+ }
+end_coredump:
+ set_fs(fs);
+ return has_dumped;
+}
+#endif
+
+/*
+ * create_aout_tables() parses the env- and arg-strings in new user
+ * memory and creates the pointer tables from them, and puts their
+ * addresses on the "stack", returning the new stack pointer value.
+ */
+static u32 __user *create_aout_tables(char __user *p, struct linux_binprm *bprm)
+{
+ u32 __user *argv, *envp, *sp;
+ int argc = bprm->argc, envc = bprm->envc;
+
+ sp = (u32 __user *) ((-(unsigned long)sizeof(u32)) & (unsigned long) p);
+ sp -= envc+1;
+ envp = sp;
+ sp -= argc+1;
+ argv = sp;
+ put_user((unsigned long) envp, --sp);
+ put_user((unsigned long) argv, --sp);
+ put_user(argc, --sp);
+ current->mm->arg_start = (unsigned long) p;
+ while (argc-- > 0) {
+ char c;
+
+ put_user((u32)(unsigned long)p, argv++);
+ do {
+ get_user(c, p++);
+ } while (c);
+ }
+ put_user(0, argv);
+ current->mm->arg_end = current->mm->env_start = (unsigned long) p;
+ while (envc-- > 0) {
+ char c;
+
+ put_user((u32)(unsigned long)p, envp++);
+ do {
+ get_user(c, p++);
+ } while (c);
+ }
+ put_user(0, envp);
+ current->mm->env_end = (unsigned long) p;
+ return sp;
+}
+
+/*
+ * These are the functions used to load a.out style executables and shared
+ * libraries. There is no binary dependent code anywhere else.
+ */
+static int load_aout_binary(struct linux_binprm *bprm)
+{
+ unsigned long error, fd_offset, rlim;
+ struct pt_regs *regs = current_pt_regs();
+ struct exec ex;
+ int retval;
+
+ ex = *((struct exec *) bprm->buf); /* exec-header */
+ if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
+ N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
+ N_TRSIZE(ex) || N_DRSIZE(ex) ||
+ i_size_read(file_inode(bprm->file)) <
+ ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
+ return -ENOEXEC;
+ }
+
+ fd_offset = N_TXTOFF(ex);
+
+ /* Check initial limits. This avoids letting people circumvent
+ * size limits imposed on them by creating programs with large
+ * arrays in the data or bss.
+ */
+ rlim = rlimit(RLIMIT_DATA);
+ if (rlim >= RLIM_INFINITY)
+ rlim = ~0;
+ if (ex.a_data + ex.a_bss > rlim)
+ return -ENOMEM;
+
+ /* Flush all traces of the currently running executable */
+ retval = flush_old_exec(bprm);
+ if (retval)
+ return retval;
+
+ /* OK, This is the point of no return */
+ set_personality(PER_LINUX);
+ set_personality_ia32(false);
+
+ setup_new_exec(bprm);
+
+ regs->cs = __USER32_CS;
+ regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
+ regs->r13 = regs->r14 = regs->r15 = 0;
+
+ current->mm->end_code = ex.a_text +
+ (current->mm->start_code = N_TXTADDR(ex));
+ current->mm->end_data = ex.a_data +
+ (current->mm->start_data = N_DATADDR(ex));
+ current->mm->brk = ex.a_bss +
+ (current->mm->start_brk = N_BSSADDR(ex));
+
+ retval = setup_arg_pages(bprm, IA32_STACK_TOP, EXSTACK_DEFAULT);
+ if (retval < 0)
+ return retval;
+
+ install_exec_creds(bprm);
+
+ if (N_MAGIC(ex) == OMAGIC) {
+ unsigned long text_addr, map_size;
+
+ text_addr = N_TXTADDR(ex);
+ map_size = ex.a_text+ex.a_data;
+
+ error = vm_brk(text_addr & PAGE_MASK, map_size);
+
+ if (error)
+ return error;
+
+ error = read_code(bprm->file, text_addr, 32,
+ ex.a_text + ex.a_data);
+ if ((signed long)error < 0)
+ return error;
+ } else {
+#ifdef WARN_OLD
+ static unsigned long error_time, error_time2;
+ if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
+ (N_MAGIC(ex) != NMAGIC) &&
+ time_after(jiffies, error_time2 + 5*HZ)) {
+ printk(KERN_NOTICE "executable not page aligned\n");
+ error_time2 = jiffies;
+ }
+
+ if ((fd_offset & ~PAGE_MASK) != 0 &&
+ time_after(jiffies, error_time + 5*HZ)) {
+ printk(KERN_WARNING
+ "fd_offset is not page aligned. Please convert "
+ "program: %pD\n",
+ bprm->file);
+ error_time = jiffies;
+ }
+#endif
+
+ if (!bprm->file->f_op->mmap || (fd_offset & ~PAGE_MASK) != 0) {
+ error = vm_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
+ if (error)
+ return error;
+
+ read_code(bprm->file, N_TXTADDR(ex), fd_offset,
+ ex.a_text+ex.a_data);
+ goto beyond_if;
+ }
+
+ error = vm_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
+ PROT_READ | PROT_EXEC,
+ MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE |
+ MAP_EXECUTABLE | MAP_32BIT,
+ fd_offset);
+
+ if (error != N_TXTADDR(ex))
+ return error;
+
+ error = vm_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
+ PROT_READ | PROT_WRITE | PROT_EXEC,
+ MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE |
+ MAP_EXECUTABLE | MAP_32BIT,
+ fd_offset + ex.a_text);
+ if (error != N_DATADDR(ex))
+ return error;
+ }
+
+beyond_if:
+ error = set_brk(current->mm->start_brk, current->mm->brk);
+ if (error)
+ return error;
+
+ set_binfmt(&aout_format);
+
+ current->mm->start_stack =
+ (unsigned long)create_aout_tables((char __user *)bprm->p, bprm);
+ /* start thread */
+ loadsegment(fs, 0);
+ loadsegment(ds, __USER32_DS);
+ loadsegment(es, __USER32_DS);
+ load_gs_index(0);
+ (regs)->ip = ex.a_entry;
+ (regs)->sp = current->mm->start_stack;
+ (regs)->flags = 0x200;
+ (regs)->cs = __USER32_CS;
+ (regs)->ss = __USER32_DS;
+ regs->r8 = regs->r9 = regs->r10 = regs->r11 =
+ regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
+ set_fs(USER_DS);
+ return 0;
+}
+
+static int load_aout_library(struct file *file)
+{
+ unsigned long bss, start_addr, len, error;
+ int retval;
+ struct exec ex;
+ loff_t pos = 0;
+
+ retval = -ENOEXEC;
+ error = kernel_read(file, &ex, sizeof(ex), &pos);
+ if (error != sizeof(ex))
+ goto out;
+
+ /* We come in here for the regular a.out style of shared libraries */
+ if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) ||
+ N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) ||
+ i_size_read(file_inode(file)) <
+ ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
+ goto out;
+ }
+
+ if (N_FLAGS(ex))
+ goto out;
+
+ /* For QMAGIC, the starting address is 0x20 into the page. We mask
+ this off to get the starting address for the page */
+
+ start_addr = ex.a_entry & 0xfffff000;
+
+ if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
+#ifdef WARN_OLD
+ static unsigned long error_time;
+ if (time_after(jiffies, error_time + 5*HZ)) {
+ printk(KERN_WARNING
+ "N_TXTOFF is not page aligned. Please convert "
+ "library: %pD\n",
+ file);
+ error_time = jiffies;
+ }
+#endif
+ retval = vm_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
+ if (retval)
+ goto out;
+
+ read_code(file, start_addr, N_TXTOFF(ex),
+ ex.a_text + ex.a_data);
+ retval = 0;
+ goto out;
+ }
+ /* Now use mmap to map the library into memory. */
+ error = vm_mmap(file, start_addr, ex.a_text + ex.a_data,
+ PROT_READ | PROT_WRITE | PROT_EXEC,
+ MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_32BIT,
+ N_TXTOFF(ex));
+ retval = error;
+ if (error != start_addr)
+ goto out;
+
+ len = PAGE_ALIGN(ex.a_text + ex.a_data);
+ bss = ex.a_text + ex.a_data + ex.a_bss;
+ if (bss > len) {
+ retval = vm_brk(start_addr + len, bss - len);
+ if (retval)
+ goto out;
+ }
+ retval = 0;
+out:
+ return retval;
+}
+
+static int __init init_aout_binfmt(void)
+{
+ register_binfmt(&aout_format);
+ return 0;
+}
+
+static void __exit exit_aout_binfmt(void)
+{
+ unregister_binfmt(&aout_format);
+}
+
+module_init(init_aout_binfmt);
+module_exit(exit_aout_binfmt);
+MODULE_LICENSE("GPL");
diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
new file mode 100644
index 0000000..86b1341
--- /dev/null
+++ b/arch/x86/ia32/ia32_signal.c
@@ -0,0 +1,406 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/arch/x86_64/ia32/ia32_signal.c
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
+ * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
+ * 2000-12-* x86-64 compatibility mode signal handling by Andi Kleen
+ */
+
+#include <linux/sched.h>
+#include <linux/sched/task_stack.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/wait.h>
+#include <linux/unistd.h>
+#include <linux/stddef.h>
+#include <linux/personality.h>
+#include <linux/compat.h>
+#include <linux/binfmts.h>
+#include <asm/ucontext.h>
+#include <linux/uaccess.h>
+#include <asm/fpu/internal.h>
+#include <asm/fpu/signal.h>
+#include <asm/ptrace.h>
+#include <asm/ia32_unistd.h>
+#include <asm/user32.h>
+#include <uapi/asm/sigcontext.h>
+#include <asm/proto.h>
+#include <asm/vdso.h>
+#include <asm/sigframe.h>
+#include <asm/sighandling.h>
+#include <asm/smap.h>
+
+/*
+ * Do a signal return; undo the signal stack.
+ */
+#define loadsegment_gs(v) load_gs_index(v)
+#define loadsegment_fs(v) loadsegment(fs, v)
+#define loadsegment_ds(v) loadsegment(ds, v)
+#define loadsegment_es(v) loadsegment(es, v)
+
+#define get_user_seg(seg) ({ unsigned int v; savesegment(seg, v); v; })
+#define set_user_seg(seg, v) loadsegment_##seg(v)
+
+#define COPY(x) { \
+ get_user_ex(regs->x, &sc->x); \
+}
+
+#define GET_SEG(seg) ({ \
+ unsigned short tmp; \
+ get_user_ex(tmp, &sc->seg); \
+ tmp; \
+})
+
+#define COPY_SEG_CPL3(seg) do { \
+ regs->seg = GET_SEG(seg) | 3; \
+} while (0)
+
+#define RELOAD_SEG(seg) { \
+ unsigned int pre = GET_SEG(seg); \
+ unsigned int cur = get_user_seg(seg); \
+ pre |= 3; \
+ if (pre != cur) \
+ set_user_seg(seg, pre); \
+}
+
+static int ia32_restore_sigcontext(struct pt_regs *regs,
+ struct sigcontext_32 __user *sc)
+{
+ unsigned int tmpflags, err = 0;
+ void __user *buf;
+ u32 tmp;
+
+ /* Always make any pending restarted system calls return -EINTR */
+ current->restart_block.fn = do_no_restart_syscall;
+
+ get_user_try {
+ /*
+ * Reload fs and gs if they have changed in the signal
+ * handler. This does not handle long fs/gs base changes in
+ * the handler, but does not clobber them at least in the
+ * normal case.
+ */
+ RELOAD_SEG(gs);
+ RELOAD_SEG(fs);
+ RELOAD_SEG(ds);
+ RELOAD_SEG(es);
+
+ COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
+ COPY(dx); COPY(cx); COPY(ip); COPY(ax);
+ /* Don't touch extended registers */
+
+ COPY_SEG_CPL3(cs);
+ COPY_SEG_CPL3(ss);
+
+ get_user_ex(tmpflags, &sc->flags);
+ regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
+ /* disable syscall checks */
+ regs->orig_ax = -1;
+
+ get_user_ex(tmp, &sc->fpstate);
+ buf = compat_ptr(tmp);
+ } get_user_catch(err);
+
+ err |= fpu__restore_sig(buf, 1);
+
+ force_iret();
+
+ return err;
+}
+
+asmlinkage long sys32_sigreturn(void)
+{
+ struct pt_regs *regs = current_pt_regs();
+ struct sigframe_ia32 __user *frame = (struct sigframe_ia32 __user *)(regs->sp-8);
+ sigset_t set;
+
+ if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+ goto badframe;
+ if (__get_user(set.sig[0], &frame->sc.oldmask)
+ || (_COMPAT_NSIG_WORDS > 1
+ && __copy_from_user((((char *) &set.sig) + 4),
+ &frame->extramask,
+ sizeof(frame->extramask))))
+ goto badframe;
+
+ set_current_blocked(&set);
+
+ if (ia32_restore_sigcontext(regs, &frame->sc))
+ goto badframe;
+ return regs->ax;
+
+badframe:
+ signal_fault(regs, frame, "32bit sigreturn");
+ return 0;
+}
+
+asmlinkage long sys32_rt_sigreturn(void)
+{
+ struct pt_regs *regs = current_pt_regs();
+ struct rt_sigframe_ia32 __user *frame;
+ sigset_t set;
+
+ frame = (struct rt_sigframe_ia32 __user *)(regs->sp - 4);
+
+ if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+ goto badframe;
+ if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
+ goto badframe;
+
+ set_current_blocked(&set);
+
+ if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext))
+ goto badframe;
+
+ if (compat_restore_altstack(&frame->uc.uc_stack))
+ goto badframe;
+
+ return regs->ax;
+
+badframe:
+ signal_fault(regs, frame, "32bit rt sigreturn");
+ return 0;
+}
+
+/*
+ * Set up a signal frame.
+ */
+
+static int ia32_setup_sigcontext(struct sigcontext_32 __user *sc,
+ void __user *fpstate,
+ struct pt_regs *regs, unsigned int mask)
+{
+ int err = 0;
+
+ put_user_try {
+ put_user_ex(get_user_seg(gs), (unsigned int __user *)&sc->gs);
+ put_user_ex(get_user_seg(fs), (unsigned int __user *)&sc->fs);
+ put_user_ex(get_user_seg(ds), (unsigned int __user *)&sc->ds);
+ put_user_ex(get_user_seg(es), (unsigned int __user *)&sc->es);
+
+ put_user_ex(regs->di, &sc->di);
+ put_user_ex(regs->si, &sc->si);
+ put_user_ex(regs->bp, &sc->bp);
+ put_user_ex(regs->sp, &sc->sp);
+ put_user_ex(regs->bx, &sc->bx);
+ put_user_ex(regs->dx, &sc->dx);
+ put_user_ex(regs->cx, &sc->cx);
+ put_user_ex(regs->ax, &sc->ax);
+ put_user_ex(current->thread.trap_nr, &sc->trapno);
+ put_user_ex(current->thread.error_code, &sc->err);
+ put_user_ex(regs->ip, &sc->ip);
+ put_user_ex(regs->cs, (unsigned int __user *)&sc->cs);
+ put_user_ex(regs->flags, &sc->flags);
+ put_user_ex(regs->sp, &sc->sp_at_signal);
+ put_user_ex(regs->ss, (unsigned int __user *)&sc->ss);
+
+ put_user_ex(ptr_to_compat(fpstate), &sc->fpstate);
+
+ /* non-iBCS2 extensions.. */
+ put_user_ex(mask, &sc->oldmask);
+ put_user_ex(current->thread.cr2, &sc->cr2);
+ } put_user_catch(err);
+
+ return err;
+}
+
+/*
+ * Determine which stack to use..
+ */
+static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
+ size_t frame_size,
+ void __user **fpstate)
+{
+ struct fpu *fpu = ¤t->thread.fpu;
+ unsigned long sp;
+
+ /* Default to using normal stack */
+ sp = regs->sp;
+
+ /* This is the X/Open sanctioned signal stack switching. */
+ if (ksig->ka.sa.sa_flags & SA_ONSTACK)
+ sp = sigsp(sp, ksig);
+ /* This is the legacy signal stack switching. */
+ else if (regs->ss != __USER32_DS &&
+ !(ksig->ka.sa.sa_flags & SA_RESTORER) &&
+ ksig->ka.sa.sa_restorer)
+ sp = (unsigned long) ksig->ka.sa.sa_restorer;
+
+ if (fpu->initialized) {
+ unsigned long fx_aligned, math_size;
+
+ sp = fpu__alloc_mathframe(sp, 1, &fx_aligned, &math_size);
+ *fpstate = (struct _fpstate_32 __user *) sp;
+ if (copy_fpstate_to_sigframe(*fpstate, (void __user *)fx_aligned,
+ math_size) < 0)
+ return (void __user *) -1L;
+ }
+
+ sp -= frame_size;
+ /* Align the stack pointer according to the i386 ABI,
+ * i.e. so that on function entry ((sp + 4) & 15) == 0. */
+ sp = ((sp + 4) & -16ul) - 4;
+ return (void __user *) sp;
+}
+
+int ia32_setup_frame(int sig, struct ksignal *ksig,
+ compat_sigset_t *set, struct pt_regs *regs)
+{
+ struct sigframe_ia32 __user *frame;
+ void __user *restorer;
+ int err = 0;
+ void __user *fpstate = NULL;
+
+ /* copy_to_user optimizes that into a single 8 byte store */
+ static const struct {
+ u16 poplmovl;
+ u32 val;
+ u16 int80;
+ } __attribute__((packed)) code = {
+ 0xb858, /* popl %eax ; movl $...,%eax */
+ __NR_ia32_sigreturn,
+ 0x80cd, /* int $0x80 */
+ };
+
+ frame = get_sigframe(ksig, regs, sizeof(*frame), &fpstate);
+
+ if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+ return -EFAULT;
+
+ if (__put_user(sig, &frame->sig))
+ return -EFAULT;
+
+ if (ia32_setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
+ return -EFAULT;
+
+ if (_COMPAT_NSIG_WORDS > 1) {
+ if (__copy_to_user(frame->extramask, &set->sig[1],
+ sizeof(frame->extramask)))
+ return -EFAULT;
+ }
+
+ if (ksig->ka.sa.sa_flags & SA_RESTORER) {
+ restorer = ksig->ka.sa.sa_restorer;
+ } else {
+ /* Return stub is in 32bit vsyscall page */
+ if (current->mm->context.vdso)
+ restorer = current->mm->context.vdso +
+ vdso_image_32.sym___kernel_sigreturn;
+ else
+ restorer = &frame->retcode;
+ }
+
+ put_user_try {
+ put_user_ex(ptr_to_compat(restorer), &frame->pretcode);
+
+ /*
+ * These are actually not used anymore, but left because some
+ * gdb versions depend on them as a marker.
+ */
+ put_user_ex(*((u64 *)&code), (u64 __user *)frame->retcode);
+ } put_user_catch(err);
+
+ if (err)
+ return -EFAULT;
+
+ /* Set up registers for signal handler */
+ regs->sp = (unsigned long) frame;
+ regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
+
+ /* Make -mregparm=3 work */
+ regs->ax = sig;
+ regs->dx = 0;
+ regs->cx = 0;
+
+ loadsegment(ds, __USER32_DS);
+ loadsegment(es, __USER32_DS);
+
+ regs->cs = __USER32_CS;
+ regs->ss = __USER32_DS;
+
+ return 0;
+}
+
+int ia32_setup_rt_frame(int sig, struct ksignal *ksig,
+ compat_sigset_t *set, struct pt_regs *regs)
+{
+ struct rt_sigframe_ia32 __user *frame;
+ void __user *restorer;
+ int err = 0;
+ void __user *fpstate = NULL;
+
+ /* __copy_to_user optimizes that into a single 8 byte store */
+ static const struct {
+ u8 movl;
+ u32 val;
+ u16 int80;
+ u8 pad;
+ } __attribute__((packed)) code = {
+ 0xb8,
+ __NR_ia32_rt_sigreturn,
+ 0x80cd,
+ 0,
+ };
+
+ frame = get_sigframe(ksig, regs, sizeof(*frame), &fpstate);
+
+ if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+ return -EFAULT;
+
+ put_user_try {
+ put_user_ex(sig, &frame->sig);
+ put_user_ex(ptr_to_compat(&frame->info), &frame->pinfo);
+ put_user_ex(ptr_to_compat(&frame->uc), &frame->puc);
+
+ /* Create the ucontext. */
+ if (boot_cpu_has(X86_FEATURE_XSAVE))
+ put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
+ else
+ put_user_ex(0, &frame->uc.uc_flags);
+ put_user_ex(0, &frame->uc.uc_link);
+ compat_save_altstack_ex(&frame->uc.uc_stack, regs->sp);
+
+ if (ksig->ka.sa.sa_flags & SA_RESTORER)
+ restorer = ksig->ka.sa.sa_restorer;
+ else
+ restorer = current->mm->context.vdso +
+ vdso_image_32.sym___kernel_rt_sigreturn;
+ put_user_ex(ptr_to_compat(restorer), &frame->pretcode);
+
+ /*
+ * Not actually used anymore, but left because some gdb
+ * versions need it.
+ */
+ put_user_ex(*((u64 *)&code), (u64 __user *)frame->retcode);
+ } put_user_catch(err);
+
+ err |= __copy_siginfo_to_user32(&frame->info, &ksig->info, false);
+ err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
+ regs, set->sig[0]);
+ err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+
+ if (err)
+ return -EFAULT;
+
+ /* Set up registers for signal handler */
+ regs->sp = (unsigned long) frame;
+ regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
+
+ /* Make -mregparm=3 work */
+ regs->ax = sig;
+ regs->dx = (unsigned long) &frame->info;
+ regs->cx = (unsigned long) &frame->uc;
+
+ loadsegment(ds, __USER32_DS);
+ loadsegment(es, __USER32_DS);
+
+ regs->cs = __USER32_CS;
+ regs->ss = __USER32_DS;
+
+ return 0;
+}
diff --git a/arch/x86/ia32/sys_ia32.c b/arch/x86/ia32/sys_ia32.c
new file mode 100644
index 0000000..11ef7b7
--- /dev/null
+++ b/arch/x86/ia32/sys_ia32.c
@@ -0,0 +1,242 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on
+ * sys_sparc32
+ *
+ * Copyright (C) 2000 VA Linux Co
+ * Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
+ * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
+ * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 2000 Hewlett-Packard Co.
+ * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 2000,2001,2002 Andi Kleen, SuSE Labs (x86-64 port)
+ *
+ * These routines maintain argument size conversion between 32bit and 64bit
+ * environment. In 2.5 most of this should be moved to a generic directory.
+ *
+ * This file assumes that there is a hole at the end of user address space.
+ *
+ * Some of the functions are LE specific currently. These are
+ * hopefully all marked. This should be fixed.
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/signal.h>
+#include <linux/syscalls.h>
+#include <linux/times.h>
+#include <linux/utsname.h>
+#include <linux/mm.h>
+#include <linux/uio.h>
+#include <linux/poll.h>
+#include <linux/personality.h>
+#include <linux/stat.h>
+#include <linux/rwsem.h>
+#include <linux/compat.h>
+#include <linux/vfs.h>
+#include <linux/ptrace.h>
+#include <linux/highuid.h>
+#include <linux/sysctl.h>
+#include <linux/slab.h>
+#include <linux/sched/task.h>
+#include <asm/mman.h>
+#include <asm/types.h>
+#include <linux/uaccess.h>
+#include <linux/atomic.h>
+#include <asm/vgtod.h>
+#include <asm/ia32.h>
+
+#define AA(__x) ((unsigned long)(__x))
+
+
+COMPAT_SYSCALL_DEFINE3(x86_truncate64, const char __user *, filename,
+ unsigned long, offset_low, unsigned long, offset_high)
+{
+ return ksys_truncate(filename,
+ ((loff_t) offset_high << 32) | offset_low);
+}
+
+COMPAT_SYSCALL_DEFINE3(x86_ftruncate64, unsigned int, fd,
+ unsigned long, offset_low, unsigned long, offset_high)
+{
+ return ksys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
+}
+
+/*
+ * Another set for IA32/LFS -- x86_64 struct stat is different due to
+ * support for 64bit inode numbers.
+ */
+static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat)
+{
+ typeof(ubuf->st_uid) uid = 0;
+ typeof(ubuf->st_gid) gid = 0;
+ SET_UID(uid, from_kuid_munged(current_user_ns(), stat->uid));
+ SET_GID(gid, from_kgid_munged(current_user_ns(), stat->gid));
+ if (!access_ok(VERIFY_WRITE, ubuf, sizeof(struct stat64)) ||
+ __put_user(huge_encode_dev(stat->dev), &ubuf->st_dev) ||
+ __put_user(stat->ino, &ubuf->__st_ino) ||
+ __put_user(stat->ino, &ubuf->st_ino) ||
+ __put_user(stat->mode, &ubuf->st_mode) ||
+ __put_user(stat->nlink, &ubuf->st_nlink) ||
+ __put_user(uid, &ubuf->st_uid) ||
+ __put_user(gid, &ubuf->st_gid) ||
+ __put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev) ||
+ __put_user(stat->size, &ubuf->st_size) ||
+ __put_user(stat->atime.tv_sec, &ubuf->st_atime) ||
+ __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec) ||
+ __put_user(stat->mtime.tv_sec, &ubuf->st_mtime) ||
+ __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
+ __put_user(stat->ctime.tv_sec, &ubuf->st_ctime) ||
+ __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
+ __put_user(stat->blksize, &ubuf->st_blksize) ||
+ __put_user(stat->blocks, &ubuf->st_blocks))
+ return -EFAULT;
+ return 0;
+}
+
+COMPAT_SYSCALL_DEFINE2(x86_stat64, const char __user *, filename,
+ struct stat64 __user *, statbuf)
+{
+ struct kstat stat;
+ int ret = vfs_stat(filename, &stat);
+
+ if (!ret)
+ ret = cp_stat64(statbuf, &stat);
+ return ret;
+}
+
+COMPAT_SYSCALL_DEFINE2(x86_lstat64, const char __user *, filename,
+ struct stat64 __user *, statbuf)
+{
+ struct kstat stat;
+ int ret = vfs_lstat(filename, &stat);
+ if (!ret)
+ ret = cp_stat64(statbuf, &stat);
+ return ret;
+}
+
+COMPAT_SYSCALL_DEFINE2(x86_fstat64, unsigned int, fd,
+ struct stat64 __user *, statbuf)
+{
+ struct kstat stat;
+ int ret = vfs_fstat(fd, &stat);
+ if (!ret)
+ ret = cp_stat64(statbuf, &stat);
+ return ret;
+}
+
+COMPAT_SYSCALL_DEFINE4(x86_fstatat, unsigned int, dfd,
+ const char __user *, filename,
+ struct stat64 __user *, statbuf, int, flag)
+{
+ struct kstat stat;
+ int error;
+
+ error = vfs_fstatat(dfd, filename, &stat, flag);
+ if (error)
+ return error;
+ return cp_stat64(statbuf, &stat);
+}
+
+/*
+ * Linux/i386 didn't use to be able to handle more than
+ * 4 system call parameters, so these system calls used a memory
+ * block for parameter passing..
+ */
+
+struct mmap_arg_struct32 {
+ unsigned int addr;
+ unsigned int len;
+ unsigned int prot;
+ unsigned int flags;
+ unsigned int fd;
+ unsigned int offset;
+};
+
+COMPAT_SYSCALL_DEFINE1(x86_mmap, struct mmap_arg_struct32 __user *, arg)
+{
+ struct mmap_arg_struct32 a;
+
+ if (copy_from_user(&a, arg, sizeof(a)))
+ return -EFAULT;
+
+ if (a.offset & ~PAGE_MASK)
+ return -EINVAL;
+
+ return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
+ a.offset>>PAGE_SHIFT);
+}
+
+/* warning: next two assume little endian */
+COMPAT_SYSCALL_DEFINE5(x86_pread, unsigned int, fd, char __user *, ubuf,
+ u32, count, u32, poslo, u32, poshi)
+{
+ return ksys_pread64(fd, ubuf, count,
+ ((loff_t)AA(poshi) << 32) | AA(poslo));
+}
+
+COMPAT_SYSCALL_DEFINE5(x86_pwrite, unsigned int, fd, const char __user *, ubuf,
+ u32, count, u32, poslo, u32, poshi)
+{
+ return ksys_pwrite64(fd, ubuf, count,
+ ((loff_t)AA(poshi) << 32) | AA(poslo));
+}
+
+
+/*
+ * Some system calls that need sign extended arguments. This could be
+ * done by a generic wrapper.
+ */
+COMPAT_SYSCALL_DEFINE6(x86_fadvise64_64, int, fd, __u32, offset_low,
+ __u32, offset_high, __u32, len_low, __u32, len_high,
+ int, advice)
+{
+ return ksys_fadvise64_64(fd,
+ (((u64)offset_high)<<32) | offset_low,
+ (((u64)len_high)<<32) | len_low,
+ advice);
+}
+
+COMPAT_SYSCALL_DEFINE4(x86_readahead, int, fd, unsigned int, off_lo,
+ unsigned int, off_hi, size_t, count)
+{
+ return ksys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
+}
+
+COMPAT_SYSCALL_DEFINE6(x86_sync_file_range, int, fd, unsigned int, off_low,
+ unsigned int, off_hi, unsigned int, n_low,
+ unsigned int, n_hi, int, flags)
+{
+ return ksys_sync_file_range(fd,
+ ((u64)off_hi << 32) | off_low,
+ ((u64)n_hi << 32) | n_low, flags);
+}
+
+COMPAT_SYSCALL_DEFINE5(x86_fadvise64, int, fd, unsigned int, offset_lo,
+ unsigned int, offset_hi, size_t, len, int, advice)
+{
+ return ksys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
+ len, advice);
+}
+
+COMPAT_SYSCALL_DEFINE6(x86_fallocate, int, fd, int, mode,
+ unsigned int, offset_lo, unsigned int, offset_hi,
+ unsigned int, len_lo, unsigned int, len_hi)
+{
+ return ksys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
+ ((u64)len_hi << 32) | len_lo);
+}
+
+/*
+ * The 32-bit clone ABI is CONFIG_CLONE_BACKWARDS
+ */
+COMPAT_SYSCALL_DEFINE5(x86_clone, unsigned long, clone_flags,
+ unsigned long, newsp, int __user *, parent_tidptr,
+ unsigned long, tls_val, int __user *, child_tidptr)
+{
+ return _do_fork(clone_flags, newsp, 0, parent_tidptr, child_tidptr,
+ tls_val);
+}