9 files changed, 94 insertions, 69 deletions
diff --git a/library/std/src/sys/fs/hermit.rs b/library/std/src/sys/fs/hermit.rs
index e9339ff261c..1191e335daa 100644
--- a/library/std/src/sys/fs/hermit.rs
+++ b/library/std/src/sys/fs/hermit.rs
@@ -417,12 +417,12 @@ impl File {
         Ok(())
     }
 
-    pub fn seek(&self, _pos: SeekFrom) -> io::Result<u64> {
-        Err(Error::from_raw_os_error(22))
+    pub fn seek(&self, pos: SeekFrom) -> io::Result<u64> {
+        self.0.seek(pos)
     }
 
     pub fn tell(&self) -> io::Result<u64> {
-        self.seek(SeekFrom::Current(0))
+        self.0.tell()
     }
 
     pub fn duplicate(&self) -> io::Result<File> {
diff --git a/library/std/src/sys/fs/uefi.rs b/library/std/src/sys/fs/uefi.rs
index 45e93deffa3..56aed7dfd8e 100644
--- a/library/std/src/sys/fs/uefi.rs
+++ b/library/std/src/sys/fs/uefi.rs
@@ -1,14 +1,21 @@
 use crate::ffi::OsString;
 use crate::fmt;
-use crate::hash::{Hash, Hasher};
+use crate::hash::Hash;
 use crate::io::{self, BorrowedCursor, IoSlice, IoSliceMut, SeekFrom};
 use crate::path::{Path, PathBuf};
 use crate::sys::time::SystemTime;
 use crate::sys::unsupported;
 
+#[expect(dead_code)]
+const FILE_PERMISSIONS_MASK: u64 = r_efi::protocols::file::READ_ONLY;
+
 pub struct File(!);
 
-pub struct FileAttr(!);
+#[derive(Clone)]
+pub struct FileAttr {
+    attr: u64,
+    size: u64,
+}
 
 pub struct ReadDir(!);
 
@@ -20,42 +27,40 @@ pub struct OpenOptions {}
 #[derive(Copy, Clone, Debug, Default)]
 pub struct FileTimes {}
 
-pub struct FilePermissions(!);
+#[derive(Clone, PartialEq, Eq, Debug)]
+// Bool indicates if file is readonly
+pub struct FilePermissions(bool);
 
-pub struct FileType(!);
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
+// Bool indicates if directory
+pub struct FileType(bool);
 
 #[derive(Debug)]
 pub struct DirBuilder {}
 
 impl FileAttr {
     pub fn size(&self) -> u64 {
-        self.0
+        self.size
     }
 
     pub fn perm(&self) -> FilePermissions {
-        self.0
+        FilePermissions::from_attr(self.attr)
     }
 
     pub fn file_type(&self) -> FileType {
-        self.0
+        FileType::from_attr(self.attr)
     }
 
     pub fn modified(&self) -> io::Result<SystemTime> {
-        self.0
+        unsupported()
     }
 
     pub fn accessed(&self) -> io::Result<SystemTime> {
-        self.0
+        unsupported()
     }
 
     pub fn created(&self) -> io::Result<SystemTime> {
-        self.0
-    }
-}
-
-impl Clone for FileAttr {
-    fn clone(&self) -> FileAttr {
-        self.0
+        unsupported()
     }
 }
 
@@ -64,28 +69,17 @@ impl FilePermissions {
         self.0
     }
 
-    pub fn set_readonly(&mut self, _readonly: bool) {
-        self.0
+    pub fn set_readonly(&mut self, readonly: bool) {
+        self.0 = readonly
     }
-}
 
-impl Clone for FilePermissions {
-    fn clone(&self) -> FilePermissions {
-        self.0
+    const fn from_attr(attr: u64) -> Self {
+        Self(attr & r_efi::protocols::file::READ_ONLY != 0)
     }
-}
-
-impl PartialEq for FilePermissions {
-    fn eq(&self, _other: &FilePermissions) -> bool {
-        self.0
-    }
-}
 
-impl Eq for FilePermissions {}
-
-impl fmt::Debug for FilePermissions {
-    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        self.0
+    #[expect(dead_code)]
+    const fn to_attr(&self) -> u64 {
+        if self.0 { r_efi::protocols::file::READ_ONLY } else { 0 }
     }
 }
 
@@ -100,39 +94,16 @@ impl FileType {
     }
 
     pub fn is_file(&self) -> bool {
-        self.0
+        !self.is_dir()
     }
 
+    // Symlinks are not supported in UEFI
     pub fn is_symlink(&self) -> bool {
-        self.0
-    }
-}
-
-impl Clone for FileType {
-    fn clone(&self) -> FileType {
-        self.0
+        false
     }
-}
-
-impl Copy for FileType {}
 
-impl PartialEq for FileType {
-    fn eq(&self, _other: &FileType) -> bool {
-        self.0
-    }
-}
-
-impl Eq for FileType {}
-
-impl Hash for FileType {
-    fn hash<H: Hasher>(&self, _h: &mut H) {
-        self.0
-    }
-}
-
-impl fmt::Debug for FileType {
-    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        self.0
+    const fn from_attr(attr: u64) -> Self {
+        Self(attr & r_efi::protocols::file::DIRECTORY != 0)
     }
 }
 
@@ -303,8 +274,8 @@ pub fn rename(_old: &Path, _new: &Path) -> io::Result<()> {
     unsupported()
 }
 
-pub fn set_perm(_p: &Path, perm: FilePermissions) -> io::Result<()> {
-    match perm.0 {}
+pub fn set_perm(_p: &Path, _perm: FilePermissions) -> io::Result<()> {
+    unsupported()
 }
 
 pub fn rmdir(_p: &Path) -> io::Result<()> {
diff --git a/library/std/src/sys/fs/unix.rs b/library/std/src/sys/fs/unix.rs
index 914971934bf..d944bc9c9a2 100644
--- a/library/std/src/sys/fs/unix.rs
+++ b/library/std/src/sys/fs/unix.rs
@@ -1454,6 +1454,20 @@ impl File {
         Ok(())
     }
 
+    // FIXME(#115199): Rust currently omits weak function definitions
+    // and its metadata from LLVM IR.
+    #[cfg_attr(
+        any(
+            target_os = "android",
+            all(
+                target_os = "linux",
+                target_env = "gnu",
+                target_pointer_width = "32",
+                not(target_arch = "riscv32")
+            )
+        ),
+        no_sanitize(cfi)
+    )]
     pub fn set_times(&self, times: FileTimes) -> io::Result<()> {
         #[cfg(not(any(
             target_os = "redox",
diff --git a/library/std/src/sys/pal/hermit/fd.rs b/library/std/src/sys/pal/hermit/fd.rs
index 79fc13bd4a8..3d6b99cd77b 100644
--- a/library/std/src/sys/pal/hermit/fd.rs
+++ b/library/std/src/sys/pal/hermit/fd.rs
@@ -2,8 +2,8 @@
 
 use super::hermit_abi;
 use crate::cmp;
-use crate::io::{self, IoSlice, IoSliceMut, Read};
-use crate::os::hermit::io::{FromRawFd, OwnedFd, RawFd, *};
+use crate::io::{self, IoSlice, IoSliceMut, Read, SeekFrom};
+use crate::os::hermit::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd};
 use crate::sys::{cvt, unsupported};
 use crate::sys_common::{AsInner, FromInner, IntoInner};
 
@@ -66,9 +66,26 @@ impl FileDesc {
         true
     }
 
+    pub fn seek(&self, pos: SeekFrom) -> io::Result<u64> {
+        let (whence, pos) = match pos {
+            // Casting to `i64` is fine, too large values will end up as
+            // negative which will cause an error in `lseek`.
+            SeekFrom::Start(off) => (hermit_abi::SEEK_SET, off as i64),
+            SeekFrom::End(off) => (hermit_abi::SEEK_END, off),
+            SeekFrom::Current(off) => (hermit_abi::SEEK_CUR, off),
+        };
+        let n = cvt(unsafe { hermit_abi::lseek(self.as_raw_fd(), pos as isize, whence) })?;
+        Ok(n as u64)
+    }
+
+    pub fn tell(&self) -> io::Result<u64> {
+        self.seek(SeekFrom::Current(0))
+    }
+
     pub fn duplicate(&self) -> io::Result<FileDesc> {
         self.duplicate_path(&[])
     }
+
     pub fn duplicate_path(&self, _path: &[u8]) -> io::Result<FileDesc> {
         unsupported()
     }
diff --git a/library/std/src/sys/pal/unix/fd.rs b/library/std/src/sys/pal/unix/fd.rs
index 2fc33bdfefb..a08c7ccec2d 100644
--- a/library/std/src/sys/pal/unix/fd.rs
+++ b/library/std/src/sys/pal/unix/fd.rs
@@ -251,6 +251,9 @@ impl FileDesc {
     }
 
     #[cfg(all(target_os = "android", target_pointer_width = "32"))]
+    // FIXME(#115199): Rust currently omits weak function definitions
+    // and its metadata from LLVM IR.
+    #[no_sanitize(cfi)]
     pub fn read_vectored_at(&self, bufs: &mut [IoSliceMut<'_>], offset: u64) -> io::Result<usize> {
         super::weak::weak!(fn preadv64(libc::c_int, *const libc::iovec, libc::c_int, off64_t) -> isize);
 
diff --git a/library/std/src/sys/pal/unix/process/process_unix.rs b/library/std/src/sys/pal/unix/process/process_unix.rs
index 25d9e935332..be9a7e91990 100644
--- a/library/std/src/sys/pal/unix/process/process_unix.rs
+++ b/library/std/src/sys/pal/unix/process/process_unix.rs
@@ -434,6 +434,9 @@ impl Command {
         target_os = "nto",
         target_vendor = "apple",
     ))]
+    // FIXME(#115199): Rust currently omits weak function definitions
+    // and its metadata from LLVM IR.
+    #[cfg_attr(target_os = "linux", no_sanitize(cfi))]
     fn posix_spawn(
         &mut self,
         stdio: &ChildPipes,
diff --git a/library/std/src/sys/pal/unix/thread.rs b/library/std/src/sys/pal/unix/thread.rs
index 11f6998cac1..abe8d3fbf68 100644
--- a/library/std/src/sys/pal/unix/thread.rs
+++ b/library/std/src/sys/pal/unix/thread.rs
@@ -188,6 +188,9 @@ impl Thread {
     }
 
     #[cfg(any(target_os = "solaris", target_os = "illumos", target_os = "nto"))]
+    // FIXME(#115199): Rust currently omits weak function definitions
+    // and its metadata from LLVM IR.
+    #[no_sanitize(cfi)]
     pub fn set_name(name: &CStr) {
         weak! {
             fn pthread_setname_np(
diff --git a/library/std/src/sys/pal/unix/time.rs b/library/std/src/sys/pal/unix/time.rs
index 0271626380c..c0a3044660b 100644
--- a/library/std/src/sys/pal/unix/time.rs
+++ b/library/std/src/sys/pal/unix/time.rs
@@ -96,6 +96,17 @@ impl Timespec {
         }
     }
 
+    // FIXME(#115199): Rust currently omits weak function definitions
+    // and its metadata from LLVM IR.
+    #[cfg_attr(
+        all(
+            target_os = "linux",
+            target_env = "gnu",
+            target_pointer_width = "32",
+            not(target_arch = "riscv32")
+        ),
+        no_sanitize(cfi)
+    )]
     pub fn now(clock: libc::clockid_t) -> Timespec {
         use crate::mem::MaybeUninit;
         use crate::sys::cvt;
diff --git a/library/std/src/sys/pal/unix/weak.rs b/library/std/src/sys/pal/unix/weak.rs
index 7ec4787f1ea..ce3f66a8374 100644
--- a/library/std/src/sys/pal/unix/weak.rs
+++ b/library/std/src/sys/pal/unix/weak.rs
@@ -144,6 +144,9 @@ unsafe fn fetch(name: &str) -> *mut libc::c_void {
 #[cfg(not(any(target_os = "linux", target_os = "android")))]
 pub(crate) macro syscall {
     (fn $name:ident($($arg_name:ident: $t:ty),*) -> $ret:ty) => (
+        // FIXME(#115199): Rust currently omits weak function definitions
+        // and its metadata from LLVM IR.
+        #[no_sanitize(cfi)]
         unsafe fn $name($($arg_name: $t),*) -> $ret {
             weak! { fn $name($($t),*) -> $ret }