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Allow cloning of kernel threads. Userspace breaks potentially due to stack aliasing

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This commit is contained in:
Jeremy Soller 2016-09-13 20:06:39 -06:00
parent 4341a2d725
commit ce50faf7ca
6 changed files with 109 additions and 38 deletions
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14
arch/x86_64/src/interrupt/syscall.rs
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@ -3,7 +3,7 @@ pub unsafe extern fn syscall() {
#[inline(never)]
unsafe fn inner() {
extern {
fn syscall(a: usize, b: usize, c: usize, d: usize, e: usize, f: usize) -> usize;
fn syscall(a: usize, b: usize, c: usize, d: usize, e: usize, f: usize, stack: usize) -> usize;
}
let mut a;
@ -13,10 +13,11 @@ pub unsafe extern fn syscall() {
let d;
let e;
let f;
asm!("" : "={rax}"(a), "={rbx}"(b), "={rcx}"(c), "={rdx}"(d), "={rsi}"(e), "={rdi}"(f)
let stack;
asm!("" : "={rax}"(a), "={rbx}"(b), "={rcx}"(c), "={rdx}"(d), "={rsi}"(e), "={rdi}"(f), "={rbp}"(stack)
: : : "intel", "volatile");
a = syscall(a, b, c, d, e, f);
a = syscall(a, b, c, d, e, f, stack);
}
asm!("" : : "{rax}"(a) : : "intel", "volatile");
@ -36,3 +37,10 @@ pub unsafe extern fn syscall() {
iretq"
: : : : "intel", "volatile");
}
#[naked]
pub unsafe extern fn clone_ret() -> usize {
asm!("pop rbp"
: : : : "intel", "volatile");
0
}