LOAD segment with RWX permissions, Linker add writable attribute after use align in section - linker

Question

My binutils version:
GNU ld (GNU Binutils) 2.39
and there is a new warn 'LOAD segment with RWX permissions'
here is the linker script
OUTPUT_ARCH( "riscv" )
ENTRY( _start )
MEMORY
{
/* Fake ROM area */
rom (rxa) : ORIGIN = 0x80000000, LENGTH = 512K
ram (wxa) : ORIGIN = 0x80080000, LENGTH = 512K
}
SECTIONS
{
.init :
{
_text = .;
KEEP (*(SORT_NONE(.init)))
} >rom AT>rom
.text :
{
*(.text.unlikely .text.unlikely.*)
*(.text.startup .text.startup.*)
*(.text .text.*)
*(.gnu.linkonce.t.*)
} >rom AT>rom
.fini :
{
KEEP (*(SORT_NONE(.fini)))
_etext = .;
} >rom AT>rom
.rodata.align :
{
. = ALIGN(4);
_rodata = .;
} >rom AT>rom
.rodata.start :
{
_rodata_lma = LOADADDR(.rodata.start);
} >rom AT>rom
.rodata :
{
*(.rdata)
*(.rodata .rodata.*)
*(.gnu.linkonce.r.*)
. = ALIGN(4);
_erodata = .;
} >rom AT>rom
.data.align :
{
. = ALIGN(4);
_data = .;
} >ram AT>rom
.data.start :
{
_data_lma = LOADADDR(.data.start);
} >ram AT>rom
.data :
{
*(.data .data.*)
*(.gnu.linkonce.d.*)
. = ALIGN(8);
PROVIDE( __global_pointer$ = . + 0x800 );
*(.sdata .sdata.*)
*(.sdata2 .sdata2.*)
*(.gnu.linkonce.s.*)
. = ALIGN(8);
*(.srodata.cst16)
*(.srodata.cst8)
*(.srodata.cst4)
*(.srodata.cst2)
*(.srodata .srodata.*)
. = ALIGN(4);
_edata = .;
} >ram AT>rom
.bss.align :
{
. = ALIGN(4);
_bss = .;
} >ram AT>rom
.bss.start :
{
_bss_lma = LOADADDR(.bss.start);
} >ram AT>rom
.bss :
{
*(.sbss*)
*(.gnu.linkonce.sb.*)
*(.bss .bss.*)
*(.gnu.linkonce.b.*)
*(COMMON)
. = ALIGN(4);
_ebss = .;
} >ram AT>rom
. = ALIGN(8);
_end = .;
.stack :
{
. = ALIGN(16);
. += __stack_size;
_stack_top = .;
} >ram AT>ram
}
I found that if I change the rodata.align section as below, the problem can fix.
.rodata.align ALIGN(4):
{
_rodata = .;
} >rom AT>rom
readelf -Sl original.elf
There are 24 section headers, starting at offset 0x29a08:
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .init PROGBITS 80000000 001000 000076 00 AX 0 0 1
[ 2] .text PROGBITS 80000100 001100 00b6f2 00 AX 0 0 256
[ 3] .rodata.align NOBITS 8000b7f2 00c7f2 000002 00 WA 0 0 1
[ 4] .rodata PROGBITS 8000b7f4 00c7f4 0009c4 00 A 0 0 4
[ 5] .data.align PROGBITS 80080000 00e9d0 000000 00 WA 0 0 1
[ 6] .data PROGBITS 80080000 00e000 0009d0 00 WA 0 0 8
[ 7] .bss.align NOBITS 800809d0 000000 000000 00 WA 0 0 1
[ 8] .bss NOBITS 800809d0 00e9d0 011e08 00 WA 0 0 16
[ 9] .stack NOBITS 800927d8 00f7d8 000134 00 WA 0 0 1
[10] .comment PROGBITS 00000000 00e9d0 00002d 01 MS 0 0 1
[11] .riscv.attributes RISCV_ATTRIBUTE 00000000 00e9fd 00002f 00 0 0 1
[12] .debug_info PROGBITS 00000000 00ea2c 003a54 00 0 0 1
[13] .debug_abbrev PROGBITS 00000000 012480 0010bc 00 0 0 1
[14] .debug_loclists PROGBITS 00000000 01353c 0097da 00 0 0 1
[15] .debug_aranges PROGBITS 00000000 01cd16 000178 00 0 0 1
[16] .debug_rnglists PROGBITS 00000000 01ce8e 001154 00 0 0 1
[17] .debug_line PROGBITS 00000000 01dfe2 007949 00 0 0 1
[18] .debug_str PROGBITS 00000000 02592b 0008ed 01 MS 0 0 1
[19] .debug_line_str PROGBITS 00000000 026218 000388 01 MS 0 0 1
[20] .debug_frame PROGBITS 00000000 0265a0 000288 00 0 0 4
[21] .symtab SYMTAB 00000000 026828 002020 10 22 343 4
[22] .strtab STRTAB 00000000 028848 0010bf 00 0 0 1
[23] .shstrtab STRTAB 00000000 029907 0000fe 00 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
L (link order), O (extra OS processing required), G (group), T (TLS),
C (compressed), x (unknown), o (OS specific), E (exclude),
D (mbind), p (processor specific)
Elf file type is EXEC (Executable file)
Entry point 0x80000000
There are 4 program headers, starting at offset 52
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
RISCV_ATTRIBUT 0x00e9fd 0x00000000 0x00000000 0x0002f 0x00000 R 0x1
LOAD 0x001000 0x80000000 0x80000000 0x0c1b8 0x0c1b8 RWE 0x1000
LOAD 0x00e000 0x80080000 0x8000c1b8 0x009d0 0x127d8 RW 0x1000
LOAD 0x0007d8 0x800927d8 0x800927d8 0x00000 0x00134 RW 0x1000
Section to Segment mapping:
Segment Sections...
00 .riscv.attributes
01 .init .text .rodata.align .rodata
02 .data .bss.align .bss
03 .stack
readelf -Sl modify.elf
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .init PROGBITS 80000000 001000 000076 00 AX 0 0 1
[ 2] .text PROGBITS 80000100 001100 00b6f2 00 AX 0 0 256
[ 3] .rodata PROGBITS 8000b7f4 00c7f4 0009c4 00 A 0 0 4
[ 4] .data.align PROGBITS 80080000 00e9d0 000000 00 WA 0 0 1
[ 5] .data PROGBITS 80080000 00e000 0009d0 00 WA 0 0 8
[ 6] .bss.align NOBITS 800809d0 000000 000000 00 WA 0 0 1
[ 7] .bss NOBITS 800809d0 00e9d0 011e08 00 WA 0 0 16
[ 8] .stack NOBITS 800927d8 00f7d8 000134 00 WA 0 0 1
[ 9] .comment PROGBITS 00000000 00e9d0 00002d 01 MS 0 0 1
[10] .riscv.attributes RISCV_ATTRIBUTE 00000000 00e9fd 00002f 00 0 0 1
[11] .debug_info PROGBITS 00000000 00ea2c 003a54 00 0 0 1
[12] .debug_abbrev PROGBITS 00000000 012480 0010bc 00 0 0 1
[13] .debug_loclists PROGBITS 00000000 01353c 0097da 00 0 0 1
[14] .debug_aranges PROGBITS 00000000 01cd16 000178 00 0 0 1
[15] .debug_rnglists PROGBITS 00000000 01ce8e 001154 00 0 0 1
[16] .debug_line PROGBITS 00000000 01dfe2 007949 00 0 0 1
[17] .debug_str PROGBITS 00000000 02592b 0008ed 01 MS 0 0 1
[18] .debug_line_str PROGBITS 00000000 026218 000388 01 MS 0 0 1
[19] .debug_frame PROGBITS 00000000 0265a0 000288 00 0 0 4
[20] .symtab SYMTAB 00000000 026828 002010 10 21 342 4
[21] .strtab STRTAB 00000000 028838 0010bf 00 0 0 1
[22] .shstrtab STRTAB 00000000 0298f7 0000f0 00 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
L (link order), O (extra OS processing required), G (group), T (TLS),
C (compressed), x (unknown), o (OS specific), E (exclude),
D (mbind), p (processor specific)
Elf file type is EXEC (Executable file)
Entry point 0x80000000
There are 4 program headers, starting at offset 52
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
RISCV_ATTRIBUT 0x00e9fd 0x00000000 0x00000000 0x0002f 0x00000 R 0x1
LOAD 0x001000 0x80000000 0x80000000 0x0c1b8 0x0c1b8 R E 0x1000
LOAD 0x00e000 0x80080000 0x8000c1b8 0x009d0 0x127d8 RW 0x1000
LOAD 0x0007d8 0x800927d8 0x800927d8 0x00000 0x00134 RW 0x1000
Why the align command cause the LOAD section has a writable attribute?
I found that if I change the rodata.align section as below, the problem can fix.
.rodata.align ALIGN(4):
{
_rodata = .;
} >rom AT>rom