From ab5c685978ec6452b0b7a9ec2e0308311b929360 Mon Sep 17 00:00:00 2001
From: 4lDO2 <4lDO2@protonmail.com>
Date: Thu, 21 Jul 2022 11:13:57 +0200
Subject: [PATCH] Remove SYS_EXEC from existence

---
 src/call.rs   | 16 +--------------
 src/data.rs   | 57 ---------------------------------------------------
 src/number.rs |  1 -
 3 files changed, 1 insertion(+), 73 deletions(-)

diff --git a/src/call.rs b/src/call.rs
index f42eaf9..1e8eac6 100644
--- a/src/call.rs
+++ b/src/call.rs
@@ -1,5 +1,5 @@
 use super::arch::*;
-use super::data::{ExecMemRange, Map, SigAction, Stat, StatVfs, TimeSpec};
+use super::data::{Map, SigAction, Stat, StatVfs, TimeSpec};
 use super::error::Result;
 use super::flag::*;
 use super::number::*;
@@ -80,20 +80,6 @@ pub fn fcntl(fd: usize, cmd: usize, arg: usize) -> Result<usize> {
     unsafe { syscall3(SYS_FCNTL, fd, cmd, arg) }
 }
 
-// TODO: Support specifying FDs to keep/close (for FDs not included in that list, it would take
-// into account O_CLOEXEC).
-// TODO: Allow setting all registers of the target process?
-/// Replace the current process with a new executable, allowing the user to specify memory ranges
-/// to either keep, move, or add. It will then jump to [`instruction_ptr`] in the new process
-/// memory specified by the range map, with the stack pointer set accordingly. This syscall does
-/// not support setuid/setgid; instead, privilege escalation must be done by a higher-privileged
-/// process performing these actions via ptrace.
-// TODO: never type
-pub fn exec(memranges: &[ExecMemRange], instruction_ptr: usize, stack_ptr: usize) -> Result<core::convert::Infallible> {
-    unsafe { syscall4(SYS_EXEC, memranges.as_ptr() as usize, memranges.len(), instruction_ptr, stack_ptr)?; }
-    panic!("SYS_EXEC should only return in case of an error");
-}
-
 /// Map a file into memory, but with the ability to set the address to map into, either as a hint
 /// or as a requirement of the map.
 ///
diff --git a/src/data.rs b/src/data.rs
index 683a4be..45d2dd8 100644
--- a/src/data.rs
+++ b/src/data.rs
@@ -295,60 +295,3 @@ macro_rules! ptrace_event {
         }
     }
 }
-
-#[repr(C)]
-#[derive(Clone, Copy, Debug)]
-pub struct ExecMemRange {
-    /// The address where the range is intended to be.
-    pub address: usize,
-    /// The size of the memory range.
-    pub size: usize,
-    /// Flags describing permissions (i.e. R/W/X)
-    pub flags: usize,
-    /// If this equals [`address`], the range is kept untouched although flags can change, and the
-    /// range can be shortened or partly zeroed. If it is different, it will move `[old_address,
-    /// old_address+size)` to `[address, address+size]`.
-    pub old_address: usize,
-}
-impl Deref for ExecMemRange {
-    type Target = [u8];
-    fn deref(&self) -> &[u8] {
-        unsafe {
-            slice::from_raw_parts(self as *const ExecMemRange as *const u8, mem::size_of::<ExecMemRange>())
-        }
-    }
-}
-
-impl DerefMut for ExecMemRange {
-    fn deref_mut(&mut self) -> &mut [u8] {
-        unsafe {
-            slice::from_raw_parts_mut(self as *mut ExecMemRange as *mut u8, mem::size_of::<ExecMemRange>())
-        }
-    }
-}
-#[repr(C)]
-#[derive(Clone, Copy, Debug)]
-pub struct CloneInfo  {
-    /// The newly allocated stack to use for the child process when [`CLONE_VM`] is set. Otherwise
-    /// it is ignored.
-    pub target_stack: usize,
-    /// The newly allocated signal stack, when [`CLONE_VM`] is set, otherwise ignored. If no signal
-    /// stack is desired (i.e. all sigactions are SIG_DFL), then this may be set to `usize::MAX`.
-    pub target_sigstack: usize,
-}
-impl Deref for CloneInfo {
-    type Target = [u8];
-    fn deref(&self) -> &[u8] {
-        unsafe {
-            slice::from_raw_parts(self as *const Self as *const u8, mem::size_of::<Self>())
-        }
-    }
-}
-
-impl DerefMut for CloneInfo {
-    fn deref_mut(&mut self) -> &mut [u8] {
-        unsafe {
-            slice::from_raw_parts_mut(self as *mut Self as *mut u8, mem::size_of::<Self>())
-        }
-    }
-}
diff --git a/src/number.rs b/src/number.rs
index 5cf50f7..a35f469 100644
--- a/src/number.rs
+++ b/src/number.rs
@@ -38,7 +38,6 @@ pub const SYS_FSYNC: usize =      SYS_CLASS_FILE | 118;
 pub const SYS_FTRUNCATE: usize =  SYS_CLASS_FILE | 93;
 pub const SYS_FUTIMENS: usize =   SYS_CLASS_FILE | SYS_ARG_SLICE | 320;
 
-pub const SYS_EXEC: usize =     101;
 pub const SYS_CHDIR: usize =    12;
 pub const SYS_CLOCK_GETTIME: usize = 265;
 pub const SYS_EXIT: usize =     1;