From eea5575bd364d6327f46e02d0301e62a68d3ca5a Mon Sep 17 00:00:00 2001
From: Arthur Gautier <baloo@superbaloo.net>
Date: Tue, 23 Feb 2021 07:42:56 +0000
Subject: [PATCH] tpm-tss2: do not rely on a dynamic load path for tcti modules

Signed-off-by: Arthur Gautier <baloo@superbaloo.net>
---
 .../libraries/tpm2-tss/default.nix            | 24 +++++++++++-
 .../tpm2-tss/no-dynamic-loader-path.patch     | 39 +++++++++++++++++++
 2 files changed, 62 insertions(+), 1 deletion(-)
 create mode 100644 pkgs/development/libraries/tpm2-tss/no-dynamic-loader-path.patch

diff --git a/pkgs/development/libraries/tpm2-tss/default.nix b/pkgs/development/libraries/tpm2-tss/default.nix
index fa506733c16e..42e6e920be4e 100644
--- a/pkgs/development/libraries/tpm2-tss/default.nix
+++ b/pkgs/development/libraries/tpm2-tss/default.nix
@@ -27,7 +27,21 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
-  postPatch = "patchShebangs script";
+  patches = [
+    # Do not rely on dynamic loader path
+    # TCTI loader relies on dlopen(), this patch prefixes all calls with the output directory
+    ./no-dynamic-loader-path.patch
+  ];
+
+  postPatch = ''
+    patchShebangs script
+    substituteInPlace src/tss2-tcti/tctildr-dl.c \
+      --replace '@PREFIX@' $out/lib/
+    substituteInPlace ./test/unit/tctildr-dl.c \
+      --replace ', "libtss2' ", \"$out/lib/libtss2" \
+      --replace ', "foo' ", \"$out/lib/foo" \
+      --replace ', TEST_TCTI_NAME' ", \"$out/lib/\"TEST_TCTI_NAME"
+  '';
 
   configureFlags = [
     "--enable-unit"
@@ -35,6 +49,14 @@ stdenv.mkDerivation rec {
   ];
 
   doCheck = true;
+  preCheck = ''
+    # Since we rewrote the load path in the dynamic loader for the TCTI
+    # The various tcti implementation should be placed in their target directory
+    # before we could run tests
+    installPhase
+    # install already done, dont need another one
+    dontInstall=1
+  '';
 
   postInstall = ''
     # Do not install the upstream udev rules, they rely on specific
diff --git a/pkgs/development/libraries/tpm2-tss/no-dynamic-loader-path.patch b/pkgs/development/libraries/tpm2-tss/no-dynamic-loader-path.patch
new file mode 100644
index 000000000000..86cdcd1541e6
--- /dev/null
+++ b/pkgs/development/libraries/tpm2-tss/no-dynamic-loader-path.patch
@@ -0,0 +1,39 @@
+diff --git a/src/tss2-tcti/tctildr-dl.c b/src/tss2-tcti/tctildr-dl.c
+index b364695c..b13be3ef 100644
+--- a/src/tss2-tcti/tctildr-dl.c
++++ b/src/tss2-tcti/tctildr-dl.c
+@@ -85,7 +85,15 @@ handle_from_name(const char *file,
+     if (handle == NULL) {
+         return TSS2_TCTI_RC_BAD_REFERENCE;
+     }
+-    *handle = dlopen(file, RTLD_NOW);
++    size = snprintf(file_xfrm,
++                    sizeof (file_xfrm),
++                    "@PREFIX@%s",
++                    file);
++    if (size >= sizeof (file_xfrm)) {
++        LOG_ERROR("TCTI name truncated in transform.");
++        return TSS2_TCTI_RC_BAD_VALUE;
++    }
++    *handle = dlopen(file_xfrm, RTLD_NOW);
+     if (*handle != NULL) {
+         return TSS2_RC_SUCCESS;
+     } else {
+@@ -94,7 +102,7 @@ handle_from_name(const char *file,
+     /* 'name' alone didn't work, try libtss2-tcti-<name>.so.0 */
+     size = snprintf(file_xfrm,
+                     sizeof (file_xfrm),
+-                    TCTI_NAME_TEMPLATE_0,
++                    "@PREFIX@" TCTI_NAME_TEMPLATE_0,
+                     file);
+     if (size >= sizeof (file_xfrm)) {
+         LOG_ERROR("TCTI name truncated in transform.");
+@@ -109,7 +117,7 @@ handle_from_name(const char *file,
+     /* libtss2-tcti-<name>.so.0 didn't work, try libtss2-tcti-<name>.so */
+     size = snprintf(file_xfrm,
+                     sizeof (file_xfrm),
+-                    TCTI_NAME_TEMPLATE,
++                    "@PREFIX@" TCTI_NAME_TEMPLATE,
+                     file);
+     if (size >= sizeof (file_xfrm)) {
+         LOG_ERROR("TCTI name truncated in transform.");