Re: [PATCH] x86: Deprecate a.out support

Linus Torvalds
2019-03-10T22:48:28Z

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On Sun, Mar 10, 2019 at 2:37 PM Matt Turner <mattst88@gmail.com> wrote:
>
> I'm not aware of a reason to keep a.out support on alpha.

Hmm. I was looking at removing a.out support entirely, but it's
actually fairly incestuous on alpha.

For example, arch/alpha/boot/tools/objstrip.c very much has some a.out
support in it. Maybe it can just be removed entirely.

There's also an a.out.h include in arch/alpha/kernel/binfmt_loader.c.

Finally, note that CONFIG_OSF4_COMPAT also no longer makes sense
without a.out support.

So this attached patch does not compile on alpha, but it's been many
many years since I had an alpha to test with, so I'm stuck.

Matt, can you fill in the details and complete this patch?

Linus

[-- Attachment #2: patch.diff --]
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arch/alpha/Kconfig | 1 -
arch/alpha/kernel/osf_sys.c | 30 ----
arch/m68k/Kconfig | 1 -
arch/x86/Kconfig | 7 -
arch/x86/ia32/Makefile | 2 -
arch/x86/ia32/ia32_aout.c | 330 ------------------------------------------
fs/Kconfig.binfmt | 33 -----
fs/Makefile | 1 -
fs/binfmt_aout.c | 343 --------------------------------------------
include/linux/a.out.h | 18 ---
10 files changed, 766 deletions(-)

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 584a6e114853..9b9770b45f36 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -10,7 +10,6 @@ config ALPHA
select FORCE_PCI if !ALPHA_JENSEN
select PCI_DOMAINS if PCI
select PCI_SYSCALL if PCI
- select HAVE_AOUT
select HAVE_IDE
select HAVE_OPROFILE
select HAVE_PCSPKR_PLATFORM
diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index bf497b8b0ec6..09a0746c9681 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -1342,45 +1342,15 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
return addr;
}

-#ifdef CONFIG_OSF4_COMPAT
-/* Clear top 32 bits of iov_len in the user's buffer for
- compatibility with old versions of OSF/1 where iov_len
- was defined as int. */
-static int
-osf_fix_iov_len(const struct iovec __user *iov, unsigned long count)
-{
- unsigned long i;
-
- for (i = 0 ; i < count ; i++) {
- int __user *iov_len_high = (int __user *)&iov[i].iov_len + 1;
-
- if (put_user(0, iov_len_high))
- return -EFAULT;
- }
- return 0;
-}
-#endif
-
SYSCALL_DEFINE3(osf_readv, unsigned long, fd,
const struct iovec __user *, vector, unsigned long, count)
{
-#ifdef CONFIG_OSF4_COMPAT
- if (unlikely(personality(current->personality) == PER_OSF4))
- if (osf_fix_iov_len(vector, count))
- return -EFAULT;
-#endif
-
return sys_readv(fd, vector, count);
}

SYSCALL_DEFINE3(osf_writev, unsigned long, fd,
const struct iovec __user *, vector, unsigned long, count)
{
-#ifdef CONFIG_OSF4_COMPAT
- if (unlikely(personality(current->personality) == PER_OSF4))
- if (osf_fix_iov_len(vector, count))
- return -EFAULT;
-#endif
return sys_writev(fd, vector, count);
}

diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index b54206408f91..65d263c60669 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -8,7 +8,6 @@ config M68K
select ARCH_NO_COHERENT_DMA_MMAP if !MMU
select ARCH_NO_PREEMPT if !COLDFIRE
select HAVE_IDE
- select HAVE_AOUT if MMU
select HAVE_DEBUG_BUGVERBOSE
select GENERIC_IRQ_SHOW
select GENERIC_ATOMIC64
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c1f9b3cf437c..4a9438e4fba6 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2836,13 +2836,6 @@ config IA32_EMULATION
64-bit kernel. You should likely turn this on, unless you're
100% sure that you don't have any 32-bit programs left.

-config IA32_AOUT
- tristate "IA32 a.out support"
- depends on IA32_EMULATION
- depends on BROKEN
- ---help---
- Support old a.out binaries in the 32bit emulation.
-
config X86_X32
bool "x32 ABI for 64-bit mode"
depends on X86_64
diff --git a/arch/x86/ia32/Makefile b/arch/x86/ia32/Makefile
index cd4339bae066..b98fedaa7642 100644
--- a/arch/x86/ia32/Makefile
+++ b/arch/x86/ia32/Makefile
@@ -4,7 +4,5 @@

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/ia32_aout.c b/arch/x86/ia32/ia32_aout.c
deleted file mode 100644
index 3c135084e1eb..000000000000
--- a/arch/x86/ia32/ia32_aout.c
+++ /dev/null
@@ -1,330 +0,0 @@
-/*
- * 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 *);
-
-static struct linux_binfmt aout_format = {
- .module = THIS_MODULE,
- .load_binary = load_aout_binary,
- .load_shlib = load_aout_library,
-};
-
-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);
-}
-
-
-/*
- * 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/fs/Kconfig.binfmt b/fs/Kconfig.binfmt
index b795f8da81f3..b4dfd2a92d95 100644
--- a/fs/Kconfig.binfmt
+++ b/fs/Kconfig.binfmt
@@ -109,39 +109,6 @@ config BINFMT_SHARED_FLAT
help
Support FLAT shared libraries

-config HAVE_AOUT
- def_bool n
-
-config BINFMT_AOUT
- tristate "Kernel support for a.out and ECOFF binaries"
- depends on HAVE_AOUT
- ---help---
- A.out (Assembler.OUTput) is a set of formats for libraries and
- executables used in the earliest versions of UNIX. Linux used
- the a.out formats QMAGIC and ZMAGIC until they were replaced
- with the ELF format.
-
- The conversion to ELF started in 1995. This option is primarily
- provided for historical interest and for the benefit of those
- who need to run binaries from that era.
-
- Most people should answer N here. If you think you may have
- occasional use for this format, enable module support above
- and answer M here to compile this support as a module called
- binfmt_aout.
-
- If any crucial components of your system (such as /sbin/init
- or /lib/ld.so) are still in a.out format, you will have to
- say Y here.
-
-config OSF4_COMPAT
- bool "OSF/1 v4 readv/writev compatibility"
- depends on ALPHA && BINFMT_AOUT
- help
- Say Y if you are using OSF/1 binaries (like Netscape and Acrobat)
- with v4 shared libraries freely available from Compaq. If you're
- going to use shared libraries from Tru64 version 5.0 or later, say N.
-
config BINFMT_EM86
tristate "Kernel support for Linux/Intel ELF binaries"
depends on ALPHA
diff --git a/fs/Makefile b/fs/Makefile
index 7bff9abecfa4..0105e3496259 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -36,7 +36,6 @@ obj-$(CONFIG_FS_DAX) += dax.o
obj-$(CONFIG_FS_ENCRYPTION) += crypto/
obj-$(CONFIG_FILE_LOCKING) += locks.o
obj-$(CONFIG_COMPAT) += compat.o compat_ioctl.o
-obj-$(CONFIG_BINFMT_AOUT) += binfmt_aout.o
obj-$(CONFIG_BINFMT_EM86) += binfmt_em86.o
obj-$(CONFIG_BINFMT_MISC) += binfmt_misc.o
obj-$(CONFIG_BINFMT_SCRIPT) += binfmt_script.o
diff --git a/fs/binfmt_aout.c b/fs/binfmt_aout.c
deleted file mode 100644
index 1fefd87eb4b4..000000000000
--- a/fs/binfmt_aout.c
+++ /dev/null
@@ -1,343 +0,0 @@
-/*
- * linux/fs/binfmt_aout.c
- *
- * Copyright (C) 1991, 1992, 1996 Linus Torvalds
- */
-
-#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/coredump.h>
-#include <linux/slab.h>
-#include <linux/sched/task_stack.h>
-
-#include <linux/uaccess.h>
-#include <asm/cacheflush.h>
-
-static int load_aout_binary(struct linux_binprm *);
-static int load_aout_library(struct file*);
-
-static struct linux_binfmt aout_format = {
- .module = THIS_MODULE,
- .load_binary = load_aout_binary,
- .load_shlib = load_aout_library,
-};
-
-#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
-
-static int set_brk(unsigned long start, unsigned long end)
-{
- start = PAGE_ALIGN(start);
- end = PAGE_ALIGN(end);
- if (end > start)
- return vm_brk(start, end - start);
- return 0;
-}
-
-/*
- * 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 unsigned long __user *create_aout_tables(char __user *p, struct linux_binprm * bprm)
-{
- char __user * __user *argv;
- char __user * __user *envp;
- unsigned long __user *sp;
- int argc = bprm->argc;
- int envc = bprm->envc;
-
- sp = (void __user *)((-(unsigned long)sizeof(char *)) & (unsigned long) p);
-#ifdef __alpha__
-/* whee.. test-programs are so much fun. */
- put_user(0, --sp);
- put_user(0, --sp);
- if (bprm->loader) {
- put_user(0, --sp);
- put_user(1003, --sp);
- put_user(bprm->loader, --sp);
- put_user(1002, --sp);
- }
- put_user(bprm->exec, --sp);
- put_user(1001, --sp);
-#endif
- sp -= envc+1;
- envp = (char __user * __user *) sp;
- sp -= argc+1;
- argv = (char __user * __user *) sp;
-#ifndef __alpha__
- put_user((unsigned long) envp,--sp);
- put_user((unsigned long) argv,--sp);
-#endif
- put_user(argc,--sp);
- current->mm->arg_start = (unsigned long) p;
- while (argc-->0) {
- char c;
- put_user(p,argv++);
- do {
- get_user(c,p++);
- } while (c);
- }
- put_user(NULL,argv);
- current->mm->arg_end = current->mm->env_start = (unsigned long) p;
- while (envc-->0) {
- char c;
- put_user(p,envp++);
- do {
- get_user(c,p++);
- } while (c);
- }
- put_user(NULL,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)
-{
- struct pt_regs *regs = current_pt_regs();
- struct exec ex;
- unsigned long error;
- unsigned long fd_offset;
- unsigned long rlim;
- 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;
- }
-
- /*
- * Requires a mmap handler. This prevents people from using a.out
- * as part of an exploit attack against /proc-related vulnerabilities.
- */
- if (!bprm->file->f_op->mmap)
- 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 */
-#ifdef __alpha__
- SET_AOUT_PERSONALITY(bprm, ex);
-#else
- set_personality(PER_LINUX);
-#endif
- setup_new_exec(bprm);
-
- 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, STACK_TOP, EXSTACK_DEFAULT);
- if (retval < 0)
- return retval;
-
- install_exec_creds(bprm);
-
- if (N_MAGIC(ex) == OMAGIC) {
- unsigned long text_addr, map_size;
- loff_t pos;
-
- text_addr = N_TXTADDR(ex);
-
-#ifdef __alpha__
- pos = fd_offset;
- map_size = ex.a_text+ex.a_data + PAGE_SIZE - 1;
-#else
- pos = 32;
- map_size = ex.a_text+ex.a_data;
-#endif
- error = vm_brk(text_addr & PAGE_MASK, map_size);
- if (error)
- return error;
-
- error = read_code(bprm->file, text_addr, pos,
- ex.a_text+ex.a_data);
- if ((signed long)error < 0)
- return error;
- } else {
- if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
- (N_MAGIC(ex) != NMAGIC) && printk_ratelimit())
- {
- printk(KERN_NOTICE "executable not page aligned\n");
- }
-
- if ((fd_offset & ~PAGE_MASK) != 0 && printk_ratelimit())
- {
- printk(KERN_WARNING
- "fd_offset is not page aligned. Please convert program: %pD\n",
- bprm->file);
- }
-
- 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,
- 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,
- fd_offset + ex.a_text);
- if (error != N_DATADDR(ex))
- return error;
- }
-beyond_if:
- set_binfmt(&aout_format);
-
- retval = set_brk(current->mm->start_brk, current->mm->brk);
- if (retval < 0)
- return retval;
-
- current->mm->start_stack =
- (unsigned long) create_aout_tables((char __user *) bprm->p, bprm);
-#ifdef __alpha__
- regs->gp = ex.a_gpvalue;
-#endif
- finalize_exec(bprm);
- start_thread(regs, ex.a_entry, current->mm->start_stack);
- return 0;
-}
-
-static int load_aout_library(struct file *file)
-{
- struct inode * inode;
- unsigned long bss, start_addr, len;
- unsigned long error;
- int retval;
- struct exec ex;
- loff_t pos = 0;
-
- inode = file_inode(file);
-
- 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(inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
- goto out;
- }
-
- /*
- * Requires a mmap handler. This prevents people from using a.out
- * as part of an exploit attack against /proc-related vulnerabilities.
- */
- if (!file->f_op->mmap)
- 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) {
- if (printk_ratelimit())
- {
- printk(KERN_WARNING
- "N_TXTOFF is not page aligned. Please convert library: %pD\n",
- file);
- }
- 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,
- 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);
-}
-
-core_initcall(init_aout_binfmt);
-module_exit(exit_aout_binfmt);
-MODULE_LICENSE("GPL");
diff --git a/include/linux/a.out.h b/include/linux/a.out.h
deleted file mode 100644
index 600cf45645c6..000000000000
--- a/include/linux/a.out.h
+++ /dev/null
@@ -1,18 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __A_OUT_GNU_H__
-#define __A_OUT_GNU_H__
-
-#include <uapi/linux/a.out.h>
-
-#ifndef __ASSEMBLY__
-#ifdef linux
-#include <asm/page.h>
-#if defined(__i386__) || defined(__mc68000__)
-#else
-#ifndef SEGMENT_SIZE
-#define SEGMENT_SIZE PAGE_SIZE
-#endif
-#endif
-#endif
-#endif /*__ASSEMBLY__ */
-#endif /* __A_OUT_GNU_H__ */