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增加对read和write的空间校验

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This commit is contained in:
fslongjin 2022-09-17 17:31:27 +08:00
parent 0e624b1fcf
commit 7598f63383
1 changed files with 7 additions and 0 deletions
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7
kernel/syscall/syscall.c
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@ -169,6 +169,10 @@ uint64_t sys_read(struct pt_regs *regs)
void *buf = (void *)regs->r9; void *buf = (void *)regs->r9;
int64_t count = (int64_t)regs->r10; int64_t count = (int64_t)regs->r10;
// 校验buf的空间范围
if(SYSCALL_FROM_USER(regs) && (!verify_area(buf, count)))
return -EPERM;
// kdebug("sys read: fd=%d", fd_num); // kdebug("sys read: fd=%d", fd_num);
// 校验文件描述符范围 // 校验文件描述符范围
@ -205,6 +209,9 @@ uint64_t sys_write(struct pt_regs *regs)
void *buf = (void *)regs->r9; void *buf = (void *)regs->r9;
int64_t count = (int64_t)regs->r10; int64_t count = (int64_t)regs->r10;
// 校验buf的空间范围
if(SYSCALL_FROM_USER(regs) && (!verify_area(buf, count)))
return -EPERM;
kdebug("sys write: fd=%d", fd_num); kdebug("sys write: fd=%d", fd_num);
// 校验文件描述符范围 // 校验文件描述符范围