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Allow apk path to contain one subdirectory.

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In the current directory layout this prevented rm_dex and move_dex
commands to validate the apk path and thus cleaning up resources.

Bug: 16888084

(cherry picked from commit fd88ff2edd)

Change-Id: I1002529b0c35852c67540d3165d1444523460592
This commit is contained in:
Calin Juravle 2014-08-15 15:45:51 +01:00
parent efc0b35fbd
commit 9d76156266
2 changed files with 27 additions and 26 deletions
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24
cmds/installd/tests/installd_utils_test.cpp
View File

@ -101,6 +101,11 @@ TEST_F(UtilsTest, IsValidApkPath_Internal) {
EXPECT_EQ(0, validate_apk_path(internal1))
<< internal1 << " should be allowed as a valid path";
// b/16888084
const char *path2 = TEST_APP_DIR "example.com/example.apk";
EXPECT_EQ(0, validate_apk_path(path2))
<< path2 << " should be allowed as a valid path";
const char *badint1 = TEST_APP_DIR "../example.apk";
EXPECT_EQ(-1, validate_apk_path(badint1))
<< badint1 << " should be rejected as a invalid path";
@ -109,9 +114,10 @@ TEST_F(UtilsTest, IsValidApkPath_Internal) {
EXPECT_EQ(-1, validate_apk_path(badint2))
<< badint2 << " should be rejected as a invalid path";
const char *badint3 = TEST_APP_DIR "example.com/pkg.apk";
EXPECT_EQ(-1, validate_apk_path(badint3))
<< badint3 << " should be rejected as a invalid path";
// Only one subdir should be allowed.
const char *bad_path3 = TEST_APP_DIR "example.com/subdir/pkg.apk";
EXPECT_EQ(-1, validate_apk_path(bad_path3))
<< bad_path3 << " should be rejected as a invalid path";
}
TEST_F(UtilsTest, IsValidApkPath_Private) {
@ -120,6 +126,11 @@ TEST_F(UtilsTest, IsValidApkPath_Private) {
EXPECT_EQ(0, validate_apk_path(private1))
<< private1 << " should be allowed as a valid path";
// b/16888084
const char *path2 = TEST_APP_DIR "example.com/example.apk";
EXPECT_EQ(0, validate_apk_path(path2))
<< path2 << " should be allowed as a valid path";
const char *badpriv1 = TEST_APP_PRIVATE_DIR "../example.apk";
EXPECT_EQ(-1, validate_apk_path(badpriv1))
<< badpriv1 << " should be rejected as a invalid path";
@ -128,9 +139,10 @@ TEST_F(UtilsTest, IsValidApkPath_Private) {
EXPECT_EQ(-1, validate_apk_path(badpriv2))
<< badpriv2 << " should be rejected as a invalid path";
const char *badpriv3 = TEST_APP_PRIVATE_DIR "example.com/pkg.apk";
EXPECT_EQ(-1, validate_apk_path(badpriv3))
<< badpriv3 << " should be rejected as a invalid path";
// Only one subdir should be allowed.
const char *bad_path3 = TEST_APP_PRIVATE_DIR "example.com/subdir/pkg.apk";
EXPECT_EQ(-1, validate_apk_path(bad_path3))
<< bad_path3 << " should be rejected as a invalid path";
}

29
cmds/installd/utils.c
View File

@ -914,16 +914,13 @@ int copy_and_append(dir_rec_t* dst, const dir_rec_t* src, const char* suffix) {
}
/**
* Check whether path points to a valid path for an APK file. An ASEC
* directory is allowed to have one level of subdirectory names. Returns -1
* when an invalid path is encountered and 0 when a valid path is encountered.
* Check whether path points to a valid path for an APK file. Only one level of
* subdirectory names is allowed. Returns -1 when an invalid path is encountered
* and 0 when a valid path is encountered.
*/
int validate_apk_path(const char *path)
{
int allowsubdir = 0;
char *subdir = NULL;
size_t dir_len;
size_t path_len;
if (!strncmp(path, android_app_dir.path, android_app_dir.len)) {
dir_len = android_app_dir.len;
@ -931,32 +928,24 @@ int validate_apk_path(const char *path)
dir_len = android_app_private_dir.len;
} else if (!strncmp(path, android_asec_dir.path, android_asec_dir.len)) {
dir_len = android_asec_dir.len;
allowsubdir = 1;
} else {
ALOGE("invalid apk path '%s' (bad prefix)\n", path);
return -1;
}
path_len = strlen(path);
const char* subdir = strchr(path + dir_len, '/');
/*
* Only allow the path to have a subdirectory if it's been marked as being allowed.
*/
if ((subdir = strchr(path + dir_len, '/')) != NULL) {
// Only allow the path to have at most one subdirectory.
if (subdir != NULL) {
++subdir;
if (!allowsubdir
|| (path_len > (size_t) (subdir - path) && (strchr(subdir, '/') != NULL))) {
if (strchr(subdir, '/') != NULL) {
ALOGE("invalid apk path '%s' (subdir?)\n", path);
return -1;
}
}
/*
* Directories can't have a period directly after the directory markers
* to prevent ".."
*/
if (path[dir_len] == '.'
|| (subdir != NULL && ((*subdir == '.') || (strchr(subdir, '/') != NULL)))) {
// Directories can't have a period directly after the directory markers to prevent "..".
if ((path[dir_len] == '.') || ((subdir != NULL) && (*subdir == '.'))) {
ALOGE("invalid apk path '%s' (trickery)\n", path);
return -1;
}