Mark extern blocks as unsafe

4 files changed, 4 insertions, 4 deletions

diff --git a/library/std/src/sys/random/arc4random.rs b/library/std/src/sys/random/arc4random.rs
index 32467e9ebaa..e1957bceb90 100644
--- a/library/std/src/sys/random/arc4random.rs
+++ b/library/std/src/sys/random/arc4random.rs
@@ -25,7 +25,7 @@ use libc::arc4random_buf;
     target_os = "vita", // See https://github.com/vitasdk/newlib/blob/b89e5bc183b516945f9ee07eef483ecb916e45ff/newlib/libc/include/stdlib.h#L74
 ))]
 #[cfg_attr(target_os = "haiku", link(name = "bsd"))]
-extern "C" {
+unsafe extern "C" {
     fn arc4random_buf(buf: *mut core::ffi::c_void, nbytes: libc::size_t);
 }
 
diff --git a/library/std/src/sys/random/espidf.rs b/library/std/src/sys/random/espidf.rs
index fd52cb5559c..6f48f7f1f29 100644
--- a/library/std/src/sys/random/espidf.rs
+++ b/library/std/src/sys/random/espidf.rs
@@ -1,6 +1,6 @@
 use crate::ffi::c_void;
 
-extern "C" {
+unsafe extern "C" {
     fn esp_fill_random(buf: *mut c_void, len: usize);
 }
 
diff --git a/library/std/src/sys/random/fuchsia.rs b/library/std/src/sys/random/fuchsia.rs
index 77d72b3c5b7..269e0d9aeeb 100644
--- a/library/std/src/sys/random/fuchsia.rs
+++ b/library/std/src/sys/random/fuchsia.rs
@@ -4,7 +4,7 @@
 //! <https://fuchsia.dev/reference/syscalls/cprng_draw>.
 
 #[link(name = "zircon")]
-extern "C" {
+unsafe extern "C" {
     fn zx_cprng_draw(buffer: *mut u8, len: usize);
 }
 
diff --git a/library/std/src/sys/random/teeos.rs b/library/std/src/sys/random/teeos.rs
index fd6b24e19e9..6ca59cc12c9 100644
--- a/library/std/src/sys/random/teeos.rs
+++ b/library/std/src/sys/random/teeos.rs
@@ -1,4 +1,4 @@
-extern "C" {
+unsafe extern "C" {
     fn TEE_GenerateRandom(randomBuffer: *mut core::ffi::c_void, randomBufferLen: libc::size_t);
 }