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X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Claude Sonnet 4.5" Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-3.9 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH v3 18/23] riscv: linker script: create separate PT_LOAD segments for text, rodata, and data X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) Fix the linker script to generate three distinct PT_LOAD segments with correct permissions instead of combining .rodata with .data. Before this fix, the linker auto-generated only two PT_LOAD segments: 1. Text segment (PF_R|PF_X) 2. Data segment (PF_R|PF_W) - containing .rodata, .data, .bss, etc. This caused .rodata to be mapped with write permissions when riscv_mmu_setup_from_elf() or riscv_pmp_setup_from_elf() set up memory permissions based on ELF segments, defeating the W^X protection. With explicit PHDRS directives, we now generate three segments: 1. text segment (PF_R|PF_X): .text and related code sections 2. rodata segment (PF_R): .rodata and related read-only sections 3. data segment (PF_R|PF_W): .data, .bss, and related sections This ensures riscv_mmu_setup_from_elf() and riscv_pmp_setup_from_elf() correctly map .rodata as read-only instead of read-write. Signed-off-by: Sascha Hauer --- arch/riscv/lib/barebox.lds.S | 38 +++++++++++++++++++++++++------------- 1 file changed, 25 insertions(+), 13 deletions(-) diff --git a/arch/riscv/lib/barebox.lds.S b/arch/riscv/lib/barebox.lds.S index 03b3a967193cfee1c67b96632cf972a553e8bec4..77f854e73e2013ca332a0a94fd1deaa2b9978a1d 100644 --- a/arch/riscv/lib/barebox.lds.S +++ b/arch/riscv/lib/barebox.lds.S @@ -16,14 +16,23 @@ OUTPUT_ARCH(BAREBOX_OUTPUT_ARCH) ENTRY(start) OUTPUT_FORMAT(BAREBOX_OUTPUT_FORMAT) + +PHDRS +{ + text PT_LOAD FLAGS(5); /* PF_R | PF_X */ + rodata PT_LOAD FLAGS(4); /* PF_R */ + data PT_LOAD FLAGS(6); /* PF_R | PF_W */ + dynamic PT_DYNAMIC FLAGS(4); /* PF_R */ +} + SECTIONS { . = 0x0; - .image_start : { *(.__image_start) } + .image_start : { *(.__image_start) } :text . = ALIGN(4); - ._text : { *(._text) } + ._text : { *(._text) } :text .text : { _stext = .; @@ -35,44 +44,47 @@ SECTIONS KEEP(*(.text_exceptions*)) __exceptions_stop = .; *(.text*) - } + } :text BAREBOX_BARE_INIT_SIZE - . = ALIGN(4); + . = ALIGN(4096); __start_rodata = .; .rodata : { *(.rodata*) RO_DATA_SECTION - } + } :rodata __end_rodata = .; _etext = .; _sdata = .; - . = ALIGN(4); - .data : { *(.data*) } + . = ALIGN(4096); + + .data : { *(.data*) } :data /DISCARD/ : { *(.rela.plt*) } .rela.dyn : { __rel_dyn_start = .; *(.rel*) __rel_dyn_end = .; - } + } :data .dynsym : { __dynsym_start = .; *(.dynsym) __dynsym_end = .; - } + } :data + + .dynamic : { *(.dynamic) } :data :dynamic _edata = .; - .image_end : { *(.__image_end) } + .image_end : { *(.__image_end) } :data . = ALIGN(4); - .__bss_start : { *(.__bss_start) } - .bss : { *(.bss*) } - .__bss_stop : { *(.__bss_stop) } + .__bss_start : { *(.__bss_start) } :data + .bss : { *(.bss*) } :data + .__bss_stop : { *(.__bss_stop) } :data _end = .; _barebox_image_size = __bss_start; } -- 2.47.3