我注意到可执行文件的大小变得比armhf 上的大。我查看了 - 现在的最小值int main (int argc, char **argv) {return 0;}（在 gcc -Wall mini.c -o mini; strip mini 之后）约为 67 KB，其中约 64 KB 被零填充。
我怀疑编译器本身不应该受到指责，因为如果你得到 mini.o，那么它的大小约为 1200 字节。
完全是这样的：
root@orangepizero2w:~/test# cat mini.c
int main (int argc, char **argv) {
return 0;
}
root@orangepizero2w:~/test# gcc -o mini mini.c
root@orangepizero2w:~/test# strip mini
root@orangepizero2w:~/test# ls -l mini
-rwxr-xr-x 1 root root 67592 ноя 15 13:29 mini
root@orangepizero2w:~/test# ldd mini
linux-vdso.so.1 (0x0000ffff9157f000)
libc.so.6 => /lib/aarch64-linux-gnu/libc.so.6 (0x0000ffff91370000)
/lib/ld-linux-aarch64.so.1 (0x0000ffff91542000)
root@orangepizero2w:~/test# gcc -c -o mini.o mini.c
root@orangepizero2w:~/test# ls -l
итого 76
-rwxr-xr-x 1 root root 67592 ноя 15 13:29 mini
-rw-r--r-- 1 root root 50 ноя 15 13:21 mini.c
-rw-r--r-- 1 root root 1272 ноя 15 13:30 mini.o
root@orangepizero2w:~/test#
问题：为什么？最重要的是——为什么？而在没有无条件预留64KB的情况下之前又是如何工作的呢？
更新：我试图查看 objdump，但我对此一无所知：
Разделы:
Idx Name Разм VMA LMA Фа смещ. Выр. Флаги
0 .interp 0000001b 0000000000000238 0000000000000238 00000238 2**0 CONTENTS, ALLOC, LOAD, READONLY, DATA
1 .note.gnu.build-id 00000024 0000000000000254 0000000000000254 00000254 2**2 CONTENTS, ALLOC, LOAD, READONLY, DATA
2 .note.ABI-tag 00000020 0000000000000278 0000000000000278 00000278 2**2 CONTENTS, ALLOC, LOAD, READONLY, DATA
3 .gnu.hash 0000001c 0000000000000298 0000000000000298 00000298 2**3 CONTENTS, ALLOC, LOAD, READONLY, DATA
4 .dynsym 000000d8 00000000000002b8 00000000000002b8 000002b8 2**3 CONTENTS, ALLOC, LOAD, READONLY, DATA
5 .dynstr 0000008d 0000000000000390 0000000000000390 00000390 2**0 CONTENTS, ALLOC, LOAD, READONLY, DATA
6 .gnu.version 00000012 000000000000041e 000000000000041e 0000041e 2**1 CONTENTS, ALLOC, LOAD, READONLY, DATA
7 .gnu.version_r 00000030 0000000000000430 0000000000000430 00000430 2**3 CONTENTS, ALLOC, LOAD, READONLY, DATA
8 .rela.dyn 000000c0 0000000000000460 0000000000000460 00000460 2**3 CONTENTS, ALLOC, LOAD, READONLY, DATA
9 .rela.plt 00000060 0000000000000520 0000000000000520 00000520 2**3 CONTENTS, ALLOC, LOAD, READONLY, DATA
10 .init 00000018 0000000000000580 0000000000000580 00000580 2**2 CONTENTS, ALLOC, LOAD, READONLY, CODE
11 .plt 00000060 00000000000005a0 00000000000005a0 000005a0 2**4 CONTENTS, ALLOC, LOAD, READONLY, CODE
12 .text 0000012c 0000000000000600 0000000000000600 00000600 2**6 CONTENTS, ALLOC, LOAD, READONLY, CODE
13 .fini 00000014 000000000000072c 000000000000072c 0000072c 2**2 CONTENTS, ALLOC, LOAD, READONLY, CODE
14 .rodata 00000004 0000000000000740 0000000000000740 00000740 2**2 CONTENTS, ALLOC, LOAD, READONLY, DATA
15 .eh_frame_hdr 0000003c 0000000000000744 0000000000000744 00000744 2**2 CONTENTS, ALLOC, LOAD, READONLY, DATA
16 .eh_frame 000000a4 0000000000000780 0000000000000780 00000780 2**3 CONTENTS, ALLOC, LOAD, READONLY, DATA
17 .init_array 00000008 000000000001fdc8 000000000001fdc8 0000fdc8 2**3 CONTENTS, ALLOC, LOAD, DATA
18 .fini_array 00000008 000000000001fdd0 000000000001fdd0 0000fdd0 2**3 CONTENTS, ALLOC, LOAD, DATA
19 .dynamic 000001e0 000000000001fdd8 000000000001fdd8 0000fdd8 2**3 CONTENTS, ALLOC, LOAD, DATA
20 .got 00000030 000000000001ffb8 000000000001ffb8 0000ffb8 2**3 CONTENTS, ALLOC, LOAD, DATA
21 .got.plt 00000038 000000000001ffe8 000000000001ffe8 0000ffe8 2**3 CONTENTS, ALLOC, LOAD, DATA
22 .data 00000010 0000000000020020 0000000000020020 00010020 2**3 CONTENTS, ALLOC, LOAD, DATA
23 .bss 00000008 0000000000020030 0000000000020030 00010030 2**0 ALLOC
24 .comment 0000001f 0000000000000000 0000000000000000 00010030 2**0 CONTENTS, READONLY
在第 16 节和第 17 节之间有一块 64 KB 的空东西（更准确地说，据我所知，62884 字节）——与问题标题相同的漏洞。
编译器生成的链接器脚本（抱歉，我无法将代码隐藏在剧透下）：
используется внутренний сценарий компоновщика:
==================================================
/* Script for -pie -z combreloc */
/* Copyright (C) 2014-2023 Free Software Foundation, Inc.
Copying and distribution of this script, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved. */
OUTPUT_FORMAT("elf64-littleaarch64", "elf64-bigaarch64",
"elf64-littleaarch64")
OUTPUT_ARCH(aarch64)
ENTRY(_start)
SEARCH_DIR("=/usr/local/lib/aarch64-linux-gnu"); SEARCH_DIR("=/lib/aarch64-linux-gnu"); SEARCH_DIR("=/usr/lib/aarch64-linux-gnu"); SEARCH_DIR("=/usr/local/lib"); SEARCH_DIR("=/lib"); SEARCH_DIR("=/usr/lib"); SEARCH_DIR("=/usr/aarch64-linux-gnu/lib");
SECTIONS
{
/* Read-only sections, merged into text segment: */
PROVIDE (__executable_start = SEGMENT_START("text-segment", 0)); . = SEGMENT_START("text-segment", 0) + SIZEOF_HEADERS;
.interp : { *(.interp) }
.note.gnu.build-id : { *(.note.gnu.build-id) }
.hash : { *(.hash) }
.gnu.hash : { *(.gnu.hash) }
.dynsym : { *(.dynsym) }
.dynstr : { *(.dynstr) }
.gnu.version : { *(.gnu.version) }
.gnu.version_d : { *(.gnu.version_d) }
.gnu.version_r : { *(.gnu.version_r) }
.rela.dyn :
{
*(.rela.init)
*(.rela.text .rela.text.* .rela.gnu.linkonce.t.*)
*(.rela.fini)
*(.rela.rodata .rela.rodata.* .rela.gnu.linkonce.r.*)
*(.rela.data .rela.data.* .rela.gnu.linkonce.d.*)
*(.rela.tdata .rela.tdata.* .rela.gnu.linkonce.td.*)
*(.rela.tbss .rela.tbss.* .rela.gnu.linkonce.tb.*)
*(.rela.ctors)
*(.rela.dtors)
*(.rela.got)
*(.rela.bss .rela.bss.* .rela.gnu.linkonce.b.*)
*(.rela.ifunc)
}
.rela.plt :
{
*(.rela.plt)
*(.rela.iplt)
}
.init :
{
KEEP (*(SORT_NONE(.init)))
} =0x1f2003d5
.plt : ALIGN(16) { *(.plt) *(.iplt) }
.text :
{
*(.text.unlikely .text.*_unlikely .text.unlikely.*)
*(.text.exit .text.exit.*)
*(.text.startup .text.startup.*)
*(.text.hot .text.hot.*)
*(SORT(.text.sorted.*))
*(.text .stub .text.* .gnu.linkonce.t.*)
/* .gnu.warning sections are handled specially by elf.em. */
*(.gnu.warning)
} =0x1f2003d5
.fini :
{
KEEP (*(SORT_NONE(.fini)))
} =0x1f2003d5
PROVIDE (__etext = .);
PROVIDE (_etext = .);
PROVIDE (etext = .);
.rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
.rodata1 : { *(.rodata1) }
.eh_frame_hdr : { *(.eh_frame_hdr) *(.eh_frame_entry .eh_frame_entry.*) }
.eh_frame : ONLY_IF_RO { KEEP (*(.eh_frame)) *(.eh_frame.*) }
.sframe : ONLY_IF_RO { *(.sframe) *(.sframe.*) }
.gcc_except_table : ONLY_IF_RO { *(.gcc_except_table .gcc_except_table.*) }
.gnu_extab : ONLY_IF_RO { *(.gnu_extab*) }
/* These sections are generated by the Sun/Oracle C++ compiler. */
.exception_ranges : ONLY_IF_RO { *(.exception_ranges*) }
/* Adjust the address for the data segment. We want to adjust up to
the same address within the page on the next page up. */
. = DATA_SEGMENT_ALIGN (CONSTANT (MAXPAGESIZE), CONSTANT (COMMONPAGESIZE));
/* Exception handling */
.eh_frame : ONLY_IF_RW { KEEP (*(.eh_frame)) *(.eh_frame.*) }
.sframe : ONLY_IF_RW { *(.sframe) *(.sframe.*) }
.gnu_extab : ONLY_IF_RW { *(.gnu_extab) }
.gcc_except_table : ONLY_IF_RW { *(.gcc_except_table .gcc_except_table.*) }
.exception_ranges : ONLY_IF_RW { *(.exception_ranges*) }
/* Thread Local Storage sections */
.tdata :
{
PROVIDE_HIDDEN (__tdata_start = .);
*(.tdata .tdata.* .gnu.linkonce.td.*)
}
.tbss : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
.preinit_array :
{
PROVIDE_HIDDEN (__preinit_array_start = .);
KEEP (*(.preinit_array))
PROVIDE_HIDDEN (__preinit_array_end = .);
}
.init_array :
{
PROVIDE_HIDDEN (__init_array_start = .);
KEEP (*(SORT_BY_INIT_PRIORITY(.init_array.*) SORT_BY_INIT_PRIORITY(.ctors.*)))
KEEP (*(.init_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .ctors))
PROVIDE_HIDDEN (__init_array_end = .);
}
.fini_array :
{
PROVIDE_HIDDEN (__fini_array_start = .);
KEEP (*(SORT_BY_INIT_PRIORITY(.fini_array.*) SORT_BY_INIT_PRIORITY(.dtors.*)))
KEEP (*(.fini_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .dtors))
PROVIDE_HIDDEN (__fini_array_end = .);
}
.ctors :
{
/* gcc uses crtbegin.o to find the start of
the constructors, so we make sure it is
first. Because this is a wildcard, it
doesn't matter if the user does not
actually link against crtbegin.o; the
linker won't look for a file to match a
wildcard. The wildcard also means that it
doesn't matter which directory crtbegin.o
is in. */
KEEP (*crtbegin.o(.ctors))
KEEP (*crtbegin?.o(.ctors))
/* We don't want to include the .ctor section from
the crtend.o file until after the sorted ctors.
The .ctor section from the crtend file contains the
end of ctors marker and it must be last */
KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .ctors))
KEEP (*(SORT(.ctors.*)))
KEEP (*(.ctors))
}
.dtors :
{
KEEP (*crtbegin.o(.dtors))
KEEP (*crtbegin?.o(.dtors))
KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors))
KEEP (*(SORT(.dtors.*)))
KEEP (*(.dtors))
}
.jcr : { KEEP (*(.jcr)) }
.data.rel.ro : { *(.data.rel.ro.local* .gnu.linkonce.d.rel.ro.local.*) *(.data.rel.ro .data.rel.ro.* .gnu.linkonce.d.rel.ro.*) }
.dynamic : { *(.dynamic) }
.got : { *(.got) *(.igot) }
. = DATA_SEGMENT_RELRO_END (24, .);
.got.plt : { *(.got.plt) *(.igot.plt) }
.data :
{
PROVIDE (__data_start = .);
*(.data .data.* .gnu.linkonce.d.*)
SORT(CONSTRUCTORS)
}
.data1 : { *(.data1) }
_edata = .; PROVIDE (edata = .);
. = .;
__bss_start = .;
__bss_start__ = .;
.bss :
{
*(.dynbss)
*(.bss .bss.* .gnu.linkonce.b.*)
*(COMMON)
/* Align here to ensure that the .bss section occupies space up to
_end. Align after .bss to ensure correct alignment even if the
.bss section disappears because there are no input sections.
FIXME: Why do we need it? When there is no .bss section, we do not
pad the .data section. */
. = ALIGN(. != 0 ? 64 / 8 : 1);
}
_bss_end__ = .; __bss_end__ = .;
. = ALIGN(64 / 8);
. = SEGMENT_START("ldata-segment", .);
. = ALIGN(64 / 8);
__end__ = .;
_end = .; PROVIDE (end = .);
. = DATA_SEGMENT_END (.);
/* Stabs debugging sections. */
.stab 0 : { *(.stab) }
.stabstr 0 : { *(.stabstr) }
.stab.excl 0 : { *(.stab.excl) }
.stab.exclstr 0 : { *(.stab.exclstr) }
.stab.index 0 : { *(.stab.index) }
.stab.indexstr 0 : { *(.stab.indexstr) }
.comment 0 : { *(.comment) }
.gnu.build.attributes : { *(.gnu.build.attributes .gnu.build.attributes.*) }
/* DWARF debug sections.
Symbols in the DWARF debugging sections are relative to the beginning
of the section so we begin them at 0. */
/* DWARF 1. */
.debug 0 : { *(.debug) }
.line 0 : { *(.line) }
/* GNU DWARF 1 extensions. */
.debug_srcinfo 0 : { *(.debug_srcinfo) }
.debug_sfnames 0 : { *(.debug_sfnames) }
/* DWARF 1.1 and DWARF 2. */
.debug_aranges 0 : { *(.debug_aranges) }
.debug_pubnames 0 : { *(.debug_pubnames) }
/* DWARF 2. */
.debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) }
.debug_abbrev 0 : { *(.debug_abbrev) }
.debug_line 0 : { *(.debug_line .debug_line.* .debug_line_end) }
.debug_frame 0 : { *(.debug_frame) }
.debug_str 0 : { *(.debug_str) }
.debug_loc 0 : { *(.debug_loc) }
.debug_macinfo 0 : { *(.debug_macinfo) }
/* SGI/MIPS DWARF 2 extensions. */
.debug_weaknames 0 : { *(.debug_weaknames) }
.debug_funcnames 0 : { *(.debug_funcnames) }
.debug_typenames 0 : { *(.debug_typenames) }
.debug_varnames 0 : { *(.debug_varnames) }
/* DWARF 3. */
.debug_pubtypes 0 : { *(.debug_pubtypes) }
.debug_ranges 0 : { *(.debug_ranges) }
/* DWARF 5. */
.debug_addr 0 : { *(.debug_addr) }
.debug_line_str 0 : { *(.debug_line_str) }
.debug_loclists 0 : { *(.debug_loclists) }
.debug_macro 0 : { *(.debug_macro) }
.debug_names 0 : { *(.debug_names) }
.debug_rnglists 0 : { *(.debug_rnglists) }
.debug_str_offsets 0 : { *(.debug_str_offsets) }
.debug_sup 0 : { *(.debug_sup) }
.ARM.attributes 0 : { KEEP (*(.ARM.attributes)) KEEP (*(.gnu.attributes)) }
.note.gnu.arm.ident 0 : { KEEP (*(.note.gnu.arm.ident)) }
/DISCARD/ : { *(.note.GNU-stack) *(.gnu_debuglink) *(.gnu.lto_*) }
}
==================================================