systemd: fix tpm2 driver init

pkgs/os-specific/linux/systemd/0019-tpm2_context_init-fix-driver-name-checking.patch

@@ -0,0 +1,44 @@
+From 236e9281cb158be3191c500524fbc5f397a25e03 Mon Sep 17 00:00:00 2001
+From: Nick Cao <nickcao@nichi.co>
+Date: Sun, 15 Jan 2023 20:15:55 +0800
+Subject: [PATCH] tpm2_context_init: fix driver name checking
+
+https://github.com/systemd/systemd/commit/542dbc623e introduced
+additional checks for tpm2 driver names, namely ensuring the driver
+name, when concated with "libtss2-tcti-" and ".so.0", generates a valid
+filename (with no '/' inside).
+
+For example, if the driver is name "device", the line
+  fn = strjoina("libtss2-tcti-", driver, ".so.0")
+would yield "libtss2-tcti-device.so.0", passing the check. And the
+filename is then passed to dlopen for loading the driver.
+
+Our current approach for systemd to correctly locate these dynamically
+loaded libraries is to patch the filenames to include their absolute
+path. Thus the line mentioned above is patched into
+  fn = strjoina("/nix/store/xxxxxxx-tpm2-tss-3.2.0/lib/libtss2-tcti-", driver, ".so.0")
+yielding "/nix/store/xxxxxxx-tpm2-tss-3.2.0/lib/libtss2-tcti-device.so.0",
+tripping the check.
+
+This patch relaxes the check to also accept absolute paths, by replacing
+filename_is_valid with path_is_valid.
+---
+ src/shared/tpm2-util.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/shared/tpm2-util.c b/src/shared/tpm2-util.c
+index ba8dfb041d..7de5d5fc77 100644
+--- a/src/shared/tpm2-util.c
++++ b/src/shared/tpm2-util.c
+@@ -192,7 +192,7 @@ int tpm2_context_init(const char *device, struct tpm2_context *ret) {
+                 fn = strjoina("libtss2-tcti-", driver, ".so.0");
+ 
+                 /* Better safe than sorry, let's refuse strings that cannot possibly be valid driver early, before going to disk. */
+-                if (!filename_is_valid(fn))
++                if (!path_is_valid(fn))
+                         return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "TPM2 driver name '%s' not valid, refusing.", driver);
+ 
+                 dl = dlopen(fn, RTLD_NOW);
+-- 
+2.39.0
+

pkgs/os-specific/linux/systemd/default.nix

@@ -174,6 +174,7 @@ stdenv.mkDerivation {
     ./0016-pkg-config-derive-prefix-from-prefix.patch
     ./0017-inherit-systemd-environment-when-calling-generators.patch
     ./0018-core-don-t-taint-on-unmerged-usr.patch
+    ./0019-tpm2_context_init-fix-driver-name-checking.patch
   ] ++ lib.optional stdenv.hostPlatform.isMusl (
     let
       oe-core = fetchzip {