Add constants for Memory-Deny-Write-Execute prctls

(cherry picked from commit 4ed4eb6)
(backport <rust-lang#4400>)

Author: rusty-snake

libc-test/build.rs

@@ -4302,6 +4302,10 @@ fn test_linux(target: &str) {
             if loongarch64 && (name == "MFD_NOEXEC_SEAL" || name == "MFD_EXEC") {
                 return true;
             }
+            // FIXME: Requires >= 6.3 (6.6) kernel headers
+            if name == "PR_GET_MDWE" || name == "PR_MDWE_NO_INHERIT" || name == "PR_MDWE_REFUSE_EXEC_GAIN" || name == "PR_SET_MDWE" {
+                return true;
+            }
             // FIXME(musl): Requires musl >= 1.2
             if name == "SO_PREFER_BUSY_POLL"
                 || name == "SO_BUSY_POLL_BUDGET"
@@ -4583,6 +4587,9 @@ fn test_linux(target: &str) {
                 true
             }
 
+            // FIXME(linux): Requires >= 6.6 kernel headers.
+            "PR_MDWE_NO_INHERIT" => true,
+
             // FIXME(linux): Requires >= 6.8 kernel headers.
             "XDP_UMEM_TX_SW_CSUM"
             | "XDP_TXMD_FLAGS_TIMESTAMP"

libc-test/semver/linux.txt

@@ -2256,6 +2256,7 @@ PR_GET_FPEMU
 PR_GET_FPEXC
 PR_GET_FP_MODE
 PR_GET_KEEPCAPS
+PR_GET_MDWE
 PR_GET_NAME
 PR_GET_NO_NEW_PRIVS
 PR_GET_PDEATHSIG
@@ -2274,6 +2275,8 @@ PR_MCE_KILL_EARLY
 PR_MCE_KILL_GET
 PR_MCE_KILL_LATE
 PR_MCE_KILL_SET
+PR_MDWE_NO_INHERIT
+PR_MDWE_REFUSE_EXEC_GAIN
 PR_MPX_DISABLE_MANAGEMENT
 PR_MPX_ENABLE_MANAGEMENT
 PR_SCHED_CORE
@@ -2292,6 +2295,7 @@ PR_SET_FPEMU
 PR_SET_FPEXC
 PR_SET_FP_MODE
 PR_SET_KEEPCAPS
+PR_SET_MDWE
 PR_SET_MM
 PR_SET_MM_ARG_END
 PR_SET_MM_ARG_START

src/unix/linux_like/linux/mod.rs

@@ -3342,6 +3342,11 @@ pub const PR_GET_CHILD_SUBREAPER: c_int = 37;
 pub const PR_SET_NO_NEW_PRIVS: c_int = 38;
 pub const PR_GET_NO_NEW_PRIVS: c_int = 39;
 
+pub const PR_SET_MDWE: c_int = 65;
+pub const PR_GET_MDWE: c_int = 66;
+pub const PR_MDWE_REFUSE_EXEC_GAIN: c_uint = 1 << 0;
+pub const PR_MDWE_NO_INHERIT: c_uint = 1 << 1;
+
 pub const PR_GET_TID_ADDRESS: c_int = 40;
 
 pub const PR_SET_THP_DISABLE: c_int = 41;