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Fix integer overflow caused by large addr + size in memory related syscall

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This commit is contained in:
Marsman1996
2024-08-26 13:54:11 +08:00
committed by Tate, Hongliang Tian
parent e6e771e9b5
commit 0a8ad6971a
4 changed files with 25 additions and 7 deletions
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6
kernel/src/syscall/mprotect.rs
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@ -24,7 +24,11 @@ pub fn sys_mprotect(addr: Vaddr, len: usize, perms: u64, ctx: &Context) -> Resul
}
let len = len.align_up(PAGE_SIZE);
let range = addr..(addr + len);
let end = addr.checked_add(len).ok_or(Error::with_message(
Errno::ENOMEM,
"integer overflow when (addr + len)",
))?;
let range = addr..end;
root_vmar.protect(vm_perms, range)?;
Ok(SyscallReturn::Return(0))
}