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Fix a mmap MAP_FIXED issue

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This commit is contained in:
Wang Siyuan
2024-12-23 06:50:52 +00:00
committed by Tate, Hongliang Tian
parent 1e3403e756
commit 6e46641a09
1 changed files with 12 additions and 3 deletions
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15
kernel/src/syscall/mmap.rs
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@ -11,6 +11,7 @@ use crate::{
prelude::*, prelude::*,
vm::{ vm::{
perms::VmPerms, perms::VmPerms,
vmar::is_userspace_vaddr,
vmo::{VmoOptions, VmoRightsOp}, vmo::{VmoOptions, VmoRightsOp},
}, },
}; };
@ -42,7 +43,7 @@ fn do_sys_mmap(
addr: Vaddr, addr: Vaddr,
len: usize, len: usize,
vm_perms: VmPerms, vm_perms: VmPerms,
option: MMapOptions, mut option: MMapOptions,
fd: FileDesc, fd: FileDesc,
offset: usize, offset: usize,
ctx: &Context, ctx: &Context,
@ -52,7 +53,11 @@ fn do_sys_mmap(
addr, len, vm_perms, option, fd, offset addr, len, vm_perms, option, fd, offset
); );
check_option(&option)?; if option.flags.contains(MMapFlags::MAP_FIXED_NOREPLACE) {
option.flags.insert(MMapFlags::MAP_FIXED);
}
check_option(addr, &option)?;
if len == 0 { if len == 0 {
return_errno_with_message!(Errno::EINVAL, "mmap len cannot be zero"); return_errno_with_message!(Errno::EINVAL, "mmap len cannot be zero");
@ -156,11 +161,15 @@ fn do_sys_mmap(
Ok(map_addr) Ok(map_addr)
} }
fn check_option(option: &MMapOptions) -> Result<()> { fn check_option(addr: Vaddr, option: &MMapOptions) -> Result<()> {
if option.typ() == MMapType::File { if option.typ() == MMapType::File {
return_errno_with_message!(Errno::EINVAL, "Invalid mmap type"); return_errno_with_message!(Errno::EINVAL, "Invalid mmap type");
} }
if option.flags().contains(MMapFlags::MAP_FIXED) && !is_userspace_vaddr(addr) {
return_errno_with_message!(Errno::EINVAL, "Invalid mmap fixed addr");
}
Ok(()) Ok(())
} }