DivestOS/Patches/LineageOS-17.1/android_system_extras/0001-ext4_pad_filenames.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Daniel Micay <danielmicay@gmail.com>
Date: Thu, 15 Dec 2016 17:22:41 -0500
Subject: [PATCH] fscrypt: pad filenames to 32 bytes, not 16 or 4
This is done in a way that's backwards compatible with old installations
by leaving them with the previous padding settings until factory reset.
---
libfscrypt/fscrypt.cpp | 26 ++++++++++++++++++++++++--
1 file changed, 24 insertions(+), 2 deletions(-)
diff --git a/libfscrypt/fscrypt.cpp b/libfscrypt/fscrypt.cpp
index adeb66aa..7b707b9f 100644
--- a/libfscrypt/fscrypt.cpp
+++ b/libfscrypt/fscrypt.cpp
@@ -118,7 +118,7 @@ static bool is_dir_empty(const char *dirname, bool *is_empty)
return true;
}
-static uint8_t fscrypt_get_policy_flags(int filenames_encryption_mode) {
+static uint8_t fscrypt_get_policy_flags_old(int filenames_encryption_mode) {
if (filenames_encryption_mode == FS_ENCRYPTION_MODE_AES_256_CTS) {
// Use legacy padding with our original filenames encryption mode.
return FS_POLICY_FLAGS_PAD_4;
@@ -135,6 +135,18 @@ static uint8_t fscrypt_get_policy_flags(int filenames_encryption_mode) {
return FS_POLICY_FLAGS_PAD_16;
}
+static uint8_t fscrypt_get_policy_flags(int filenames_encryption_mode) {
+ if (filenames_encryption_mode == FS_ENCRYPTION_MODE_ADIANTUM) {
+ return FS_POLICY_FLAGS_PAD_32 | FS_POLICY_FLAG_DIRECT_KEY;
+ }
+ return FS_POLICY_FLAGS_PAD_32;
+}
+
+static bool fscrypt_policy_check(const char *directory, const char *policy,
+ size_t policy_length,
+ int contents_encryption_mode,
+ int filenames_encryption_mode);
+
static bool fscrypt_policy_set(const char *directory, const char *policy,
size_t policy_length,
int contents_encryption_mode,
@@ -153,6 +165,14 @@ static bool fscrypt_policy_set(const char *directory, const char *policy,
}
fscrypt_policy fp;
+ memset(&fp, 0, sizeof(fscrypt_policy));
+
+ if (ioctl(fd, FS_IOC_GET_ENCRYPTION_POLICY, &fp) == 0) {
+ close(fd);
+ return fscrypt_policy_check(directory, policy, policy_length,
+ contents_encryption_mode, filenames_encryption_mode);
+ }
+
fp.version = 0;
fp.contents_encryption_mode = contents_encryption_mode;
fp.filenames_encryption_mode = filenames_encryption_mode;
@@ -200,7 +220,9 @@ static bool fscrypt_policy_get(const char *directory, char *policy,
|| (fp.contents_encryption_mode != contents_encryption_mode)
|| (fp.filenames_encryption_mode != filenames_encryption_mode)
|| (fp.flags !=
- fscrypt_get_policy_flags(filenames_encryption_mode))) {
+ fscrypt_get_policy_flags(filenames_encryption_mode) &&
+ fp.flags !=
+ fscrypt_get_policy_flags_old(filenames_encryption_mode))) {
LOG(ERROR) << "Failed to find matching encryption policy for " << directory;
return false;
}