diff --git a/src/platform/allocator/sys.rs b/src/platform/allocator/sys.rs
index ff01eea87b..401910d59b 100644
--- a/src/platform/allocator/sys.rs
+++ b/src/platform/allocator/sys.rs
@@ -27,7 +27,7 @@ unsafe impl Allocator for System {
     fn alloc(&self, size: usize) -> (*mut u8, usize, u32) {
         let Ok(addr) = (unsafe {
             Sys::mmap(
-                0 as *mut _,
+                ptr::null_mut(),
                 size,
                 sys_mman::PROT_WRITE | sys_mman::PROT_READ,
                 sys_mman::MAP_ANON | sys_mman::MAP_PRIVATE,
@@ -37,30 +37,30 @@ unsafe impl Allocator for System {
         }) else {
             return (ptr::null_mut(), 0, 0);
         };
-        (addr as *mut u8, size, 0)
+        (addr.cast::<u8>(), size, 0)
     }
 
     fn remap(&self, ptr: *mut u8, oldsize: usize, newsize: usize, can_move: bool) -> *mut u8 {
         let flags = if can_move { MREMAP_MAYMOVE } else { 0 };
         let Ok(ptr) =
-            (unsafe { Sys::mremap(ptr as *mut _, oldsize, newsize, flags, ptr::null_mut()) })
+            (unsafe { Sys::mremap(ptr.cast(), oldsize, newsize, flags, ptr::null_mut()) })
         else {
             return ptr::null_mut();
         };
-        ptr as *mut u8
+        ptr.cast::<u8>()
     }
 
     fn free_part(&self, ptr: *mut u8, oldsize: usize, newsize: usize) -> bool {
         unsafe {
-            if Sys::mremap(ptr as *mut _, oldsize, newsize, 0, ptr::null_mut()).is_ok() {
+            if Sys::mremap(ptr.cast(), oldsize, newsize, 0, ptr::null_mut()).is_ok() {
                 return true;
             }
-            Sys::munmap(ptr.add(newsize) as *mut _, oldsize - newsize).is_ok()
+            Sys::munmap(ptr.add(newsize).cast(), oldsize - newsize).is_ok()
         }
     }
 
     fn free(&self, ptr: *mut u8, size: usize) -> bool {
-        unsafe { Sys::munmap(ptr as *mut _, size).is_ok() }
+        unsafe { Sys::munmap(ptr.cast(), size).is_ok() }
     }
 
     fn can_release_part(&self, _flags: u32) -> bool {
diff --git a/src/platform/linux/signal.rs b/src/platform/linux/signal.rs
index 570dd3f1cc..2dd8738834 100644
--- a/src/platform/linux/signal.rs
+++ b/src/platform/linux/signal.rs
@@ -1,15 +1,20 @@
-use crate::header::signal::sigval;
-use core::{mem, ptr::addr_of};
+use core::{
+    mem,
+    ptr::{self, addr_of},
+};
 
 use super::{
-    super::{PalSignal, types::*},
+    super::{
+        PalSignal,
+        types::{c_int, pid_t},
+    },
     Sys, e_raw,
 };
 use crate::{
     error::{Errno, Result},
     header::{
         bits_time::timespec,
-        signal::{SA_RESTORER, SI_QUEUE, sigaction, siginfo_t, sigset_t, stack_t},
+        signal::{SA_RESTORER, SI_QUEUE, sigaction, siginfo_t, sigset_t, sigval, stack_t},
         sys_time::itimerval,
     },
 };
@@ -17,7 +22,7 @@ use crate::{
 impl PalSignal for Sys {
     fn getitimer(which: c_int, out: &mut itimerval) -> Result<()> {
         unsafe {
-            e_raw(syscall!(GETITIMER, which, out as *mut _))?;
+            e_raw(syscall!(GETITIMER, which, ptr::from_mut(out)))?;
         }
         Ok(())
     }
@@ -56,8 +61,8 @@ impl PalSignal for Sys {
             syscall!(
                 SETITIMER,
                 which,
-                new as *const _,
-                old.map_or_else(core::ptr::null_mut, |r| r as *mut _)
+                ptr::from_ref(new),
+                old.map_or_else(ptr::null_mut, |r| ptr::from_mut(r))
             )
         })?;
         Ok(())
@@ -81,8 +86,8 @@ impl PalSignal for Sys {
             syscall!(
                 RT_SIGACTION,
                 sig,
-                act.as_ref().map_or_else(core::ptr::null, |x| x as *const _),
-                oact.map_or_else(core::ptr::null_mut, |x| x as *mut _),
+                act.as_ref().map_or_else(ptr::null, |x| ptr::from_ref(x)),
+                oact.map_or_else(ptr::null_mut, |x| ptr::from_mut(x)),
                 mem::size_of::<sigset_t>()
             )
         })
@@ -92,8 +97,8 @@ impl PalSignal for Sys {
     unsafe fn sigaltstack(ss: Option<&stack_t>, old_ss: Option<&mut stack_t>) -> Result<()> {
         e_raw(syscall!(
             SIGALTSTACK,
-            ss.map_or_else(core::ptr::null, |x| x as *const _),
-            old_ss.map_or_else(core::ptr::null_mut, |x| x as *mut _)
+            ss.map_or_else(ptr::null, |x| ptr::from_ref(x)),
+            old_ss.map_or_else(ptr::null_mut, |x| ptr::from_mut(x))
         ))
         .map(|_| ())
     }
@@ -102,7 +107,7 @@ impl PalSignal for Sys {
         e_raw(unsafe {
             syscall!(
                 RT_SIGPENDING,
-                set as *mut sigset_t as usize,
+                ptr::from_mut::<sigset_t>(set) as usize,
                 mem::size_of::<sigset_t>()
             )
         })
@@ -114,8 +119,8 @@ impl PalSignal for Sys {
             syscall!(
                 RT_SIGPROCMASK,
                 how,
-                set.map_or_else(core::ptr::null, |x| x as *const _),
-                oset.map_or_else(core::ptr::null_mut, |x| x as *mut _),
+                set.map_or_else(ptr::null, |x| ptr::from_ref(x)),
+                oset.map_or_else(ptr::null_mut, |x| ptr::from_mut(x)),
                 mem::size_of::<sigset_t>()
             )
         })
@@ -126,7 +131,7 @@ impl PalSignal for Sys {
         unsafe {
             e_raw(syscall!(
                 RT_SIGSUSPEND,
-                mask as *const sigset_t,
+                ptr::from_ref::<sigset_t>(mask),
                 size_of::<sigset_t>()
             ))
             .expect_err("must fail")
@@ -141,9 +146,9 @@ impl PalSignal for Sys {
         unsafe {
             e_raw(syscall!(
                 RT_SIGTIMEDWAIT,
-                set as *const _,
-                sig.map_or_else(core::ptr::null_mut, |s| s as *mut _),
-                tp.map_or_else(core::ptr::null, |t| t as *const _),
+                ptr::from_ref(set),
+                sig.map_or_else(ptr::null_mut, |s| ptr::from_mut(s)),
+                tp.map_or_else(ptr::null, |t| ptr::from_ref(t)),
                 size_of::<sigset_t>()
             ))
             .map(|s| s as c_int)