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https://github.com/Divested-Mobile/DivestOS-Build.git
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70 lines
3.1 KiB
Diff
70 lines
3.1 KiB
Diff
From 57f23bfb5c1d256a69684d07e2787a9b71621698 Mon Sep 17 00:00:00 2001
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From: Daniel Micay <danielmicay@gmail.com>
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Date: Thu, 15 Dec 2016 17:22:41 -0500
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Subject: [PATCH] fscrypt: pad filenames to 32 bytes, not 16 or 4
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This is done in a way that's backwards compatible with old installations
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by leaving them with the previous padding settings until factory reset.
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---
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libfscrypt/fscrypt.cpp | 26 ++++++++++++++++++++++++--
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1 file changed, 24 insertions(+), 2 deletions(-)
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diff --git a/libfscrypt/fscrypt.cpp b/libfscrypt/fscrypt.cpp
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index adeb66aa..7b707b9f 100644
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--- a/libfscrypt/fscrypt.cpp
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+++ b/libfscrypt/fscrypt.cpp
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@@ -118,7 +118,7 @@ static bool is_dir_empty(const char *dirname, bool *is_empty)
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return true;
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}
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-static uint8_t fscrypt_get_policy_flags(int filenames_encryption_mode) {
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+static uint8_t fscrypt_get_policy_flags_old(int filenames_encryption_mode) {
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if (filenames_encryption_mode == FS_ENCRYPTION_MODE_AES_256_CTS) {
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// Use legacy padding with our original filenames encryption mode.
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return FS_POLICY_FLAGS_PAD_4;
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@@ -135,6 +135,18 @@ static uint8_t fscrypt_get_policy_flags(int filenames_encryption_mode) {
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return FS_POLICY_FLAGS_PAD_16;
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}
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+static uint8_t fscrypt_get_policy_flags(int filenames_encryption_mode) {
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+ if (filenames_encryption_mode == FS_ENCRYPTION_MODE_ADIANTUM) {
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+ return FS_POLICY_FLAGS_PAD_32 | FS_POLICY_FLAG_DIRECT_KEY;
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+ }
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+ return FS_POLICY_FLAGS_PAD_32;
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+}
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+
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+static bool fscrypt_policy_check(const char *directory, const char *policy,
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+ size_t policy_length,
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+ int contents_encryption_mode,
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+ int filenames_encryption_mode);
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+
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static bool fscrypt_policy_set(const char *directory, const char *policy,
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size_t policy_length,
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int contents_encryption_mode,
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@@ -153,6 +165,14 @@ static bool fscrypt_policy_set(const char *directory, const char *policy,
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}
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fscrypt_policy fp;
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+ memset(&fp, 0, sizeof(fscrypt_policy));
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+
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+ if (ioctl(fd, FS_IOC_GET_ENCRYPTION_POLICY, &fp) == 0) {
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+ close(fd);
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+ return fscrypt_policy_check(directory, policy, policy_length,
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+ contents_encryption_mode, filenames_encryption_mode);
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+ }
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+
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fp.version = 0;
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fp.contents_encryption_mode = contents_encryption_mode;
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fp.filenames_encryption_mode = filenames_encryption_mode;
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@@ -200,7 +220,9 @@ static bool fscrypt_policy_get(const char *directory, char *policy,
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|| (fp.contents_encryption_mode != contents_encryption_mode)
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|| (fp.filenames_encryption_mode != filenames_encryption_mode)
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|| (fp.flags !=
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- fscrypt_get_policy_flags(filenames_encryption_mode))) {
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+ fscrypt_get_policy_flags(filenames_encryption_mode) &&
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+ fp.flags !=
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+ fscrypt_get_policy_flags_old(filenames_encryption_mode))) {
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LOG(ERROR) << "Failed to find matching encryption policy for " << directory;
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return false;
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}
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