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bug fix: 修复了加载进程时未对内存空间清零的问题

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This commit is contained in:
fslongjin 2022-05-25 14:37:06 +08:00
parent 8246c1c9e2
commit b02f5ea47c
1 changed files with 6 additions and 1 deletions
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7
kernel/process/process.c
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@ -365,7 +365,8 @@ static int process_load_elf_file(struct pt_regs *regs, char *path)
return (unsigned long)filp;
}
void *buf = kmalloc(sizeof(PAGE_4K_SIZE), 0);
void *buf = kmalloc(PAGE_4K_SIZE, 0);
memset(buf, 0, PAGE_4K_SIZE);
uint64_t pos = 0;
pos = filp->file_ops->lseek(filp, 0, SEEK_SET);
retval = filp->file_ops->read(filp, (char *)buf, sizeof(Elf64_Ehdr), &pos);
@ -419,6 +420,7 @@ static int process_load_elf_file(struct pt_regs *regs, char *path)
}
Elf64_Phdr *phdr = buf;
// 将程序加载到内存中
for (int i = 0; i < ehdr.e_phnum; ++i, ++phdr)
{
// kdebug("phdr[%d] phdr->p_offset=%#018lx phdr->p_vaddr=%#018lx phdr->p_memsz=%ld phdr->p_filesz=%ld phdr->p_type=%d", i, phdr->p_offset, phdr->p_vaddr, phdr->p_memsz, phdr->p_filesz, phdr->p_type);
@ -439,6 +441,7 @@ static int process_load_elf_file(struct pt_regs *regs, char *path)
if (!mm_check_mapped((uint64_t)current_pcb->mm->pgd, virt_base)) // 未映射，则新增物理页
{
mm_map_proc_page_table((uint64_t)current_pcb->mm->pgd, true, virt_base, alloc_pages(ZONE_NORMAL, 1, PAGE_PGT_MAPPED)->addr_phys, PAGE_2M_SIZE, PAGE_USER_PAGE, true);
memset((void*)virt_base, 0, PAGE_2M_SIZE);
}
pos = filp->file_ops->lseek(filp, pos, SEEK_SET);
int64_t val = 0;
@ -461,6 +464,8 @@ static int process_load_elf_file(struct pt_regs *regs, char *path)
regs->rsp = current_pcb->mm->stack_start;
regs->rbp = current_pcb->mm->stack_start;
mm_map_proc_page_table((uint64_t)current_pcb->mm->pgd, true, current_pcb->mm->stack_start - PAGE_2M_SIZE, alloc_pages(ZONE_NORMAL, 1, PAGE_PGT_MAPPED)->addr_phys, PAGE_2M_SIZE, PAGE_USER_PAGE, true);
// 清空栈空间
memset((void*)(current_pcb->mm->stack_start - PAGE_2M_SIZE), 0, PAGE_2M_SIZE);
load_elf_failed:;
if (buf != NULL)