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PROT_WRITE implies PROT_READ on x86

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Zhang Junyang
2024-10-16 18:07:01 +08:00
committed by Tate, Hongliang Tian
parent 6757b39c13
commit 1fe0a138f9
2 changed files with 19 additions and 0 deletions
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10
kernel/src/syscall/mprotect.rs
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@ -32,6 +32,16 @@ pub fn sys_mprotect(addr: Vaddr, len: usize, perms: u64, ctx: &Context) -> Resul
"integer overflow when (addr + len)",
))?;
let range = addr..end;
// On x86, `PROT_WRITE` implies `PROT_READ`.
// <https://man7.org/linux/man-pages/man2/mprotect.2.html>
#[cfg(target_arch = "x86_64")]
let vm_perms = if !vm_perms.contains(VmPerms::READ) && vm_perms.contains(VmPerms::WRITE) {
vm_perms | VmPerms::READ
} else {
vm_perms
};
root_vmar.protect(vm_perms, range)?;
Ok(SyscallReturn::Return(0))
}