寫一個讀取so的各地址段的各權限的C代碼

以下是一个简单的C代码示例，用于读取.so文件中各地址段的权限：

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <elf.h>

int main(int argc, char **argv) {
    if (argc < 2) {
        printf("Usage: %s <so_file>\n", argv[0]);
        return 1;
    }

    const char *filename = argv[1];
    FILE *fp = fopen(filename, "rb");
    if (fp == NULL) {
        printf("Failed to open file: %s\n", filename);
        return 1;
    }

    // Read ELF header
    Elf32_Ehdr header;
    fread(&header, sizeof(header), 1, fp);

    // Check ELF magic number
    if (header.e_ident[EI_MAG0] != ELFMAG0
            || header.e_ident[EI_MAG1] != ELFMAG1
            || header.e_ident[EI_MAG2] != ELFMAG2
            || header.e_ident[EI_MAG3] != ELFMAG3) {
        printf("Invalid ELF magic number\n");
        fclose(fp);
        return 1;
    }

    // Read program headers
    fseek(fp, header.e_phoff, SEEK_SET);
    Elf32_Phdr *phdrs = malloc(sizeof(Elf32_Phdr) * header.e_phnum);
    fread(phdrs, sizeof(Elf32_Phdr), header.e_phnum, fp);

    // Find the segment with the .text section
    Elf32_Phdr *text_seg = NULL;
    for (int i = 0; i < header.e_phnum; i++) {
        if (phdrs[i].p_type == PT_LOAD && (phdrs[i].p_flags & PF_X)) {
            text_seg = &phdrs[i];
            break;
        }
    }
    if (text_seg == NULL) {
        printf("Failed to find .text segment\n");
        free(phdrs);
        fclose(fp);
        return 1;
    }

    // Find the segment with the .data section
    Elf32_Phdr *data_seg = NULL;
    for (int i = 0; i < header.e_phnum; i++) {
        if (phdrs[i].p_type == PT_LOAD && (phdrs[i].p_flags & PF_W)) {
            data_seg = &phdrs[i];
            break;
        }
    }
    if (data_seg == NULL) {
        printf("Failed to find .data segment\n");
        free(phdrs);
        fclose(fp);
        return 1;
    }

    // Find the segment with the .bss section
    Elf32_Phdr *bss_seg = NULL;
    for (int i = 0; i < header.e_phnum; i++) {
        if (phdrs[i].p_type == PT_LOAD && (phdrs[i].p_flags & PF_W) && phdrs[i].p_filesz == 0) {
            bss_seg = &phdrs[i];
            break;
        }
    }
    if (bss_seg == NULL) {
        printf("Failed to find .bss segment\n");
        free(phdrs);
        fclose(fp);
        return 1;
    }

    // Print segment permissions
    printf(".text segment permissions: ");
    if (text_seg->p_flags & PF_R) printf("r");
    if (text_seg->p_flags & PF_W) printf("w");
    if (text_seg->p_flags & PF_X) printf("x");
    printf("\n");

    printf(".data segment permissions: ");
    if (data_seg->p_flags & PF_R) printf("r");
    if (data_seg->p_flags & PF_W) printf("w");
    if (data_seg->p_flags & PF_X) printf("x");
    printf("\n");

    printf(".bss segment permissions: ");
    if (bss_seg->p_flags & PF_R) printf("r");
    if (bss_seg->p_flags & PF_W) printf("w");
    if (bss_seg->p_flags & PF_X) printf("x");
    printf("\n");

    free(phdrs);
    fclose(fp);
    return 0;
}

这个程序可以读取一个.so文件的ELF头和程序头，查找包含.text、.data和.bss节的段，并输出它们的权限。请注意，这个程序只能处理32位ELF文件，如果需要处理64位ELF文件，则需要相应地修改程序。