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Merge "Do not check with vendor vndk version" into main am: 6d01651ab9 am: 9062abf0e5 am: fcdbce7f33 am: 3147ebc654 am: b94f5ee99f

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Original change: https://android-review.googlesource.com/c/platform/system/core/+/2758806

Change-Id: I6380bec21baec416a9e9bd53b8e88610447d5db7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
This commit is contained in:
Treehugger Robot 2023-09-23 17:50:46 +00:00 committed by Automerger Merge Worker
commit 19c054cc4f
1 changed files with 6 additions and 51 deletions
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57
libcutils/ashmem-dev.cpp
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@ -44,13 +44,6 @@
#include <android-base/strings.h>
#include <android-base/unique_fd.h>
/*
* The minimum vendor API level at and after which it is safe to use memfd.
* This is to facilitate deprecation of ashmem.
*/
#define MIN_MEMFD_VENDOR_API_LEVEL 29
#define MIN_MEMFD_VENDOR_API_LEVEL_CHAR 'Q'
/* ashmem identity */
static dev_t __ashmem_rdev;
/*
@ -88,55 +81,17 @@ static bool pin_deprecation_warn = true; /* Log the pin deprecation warning only
/* Determine if vendor processes would be ok with memfd in the system:
*
* If VNDK is using older libcutils, don't use memfd. This is so that the
* same shared memory mechanism is used across binder transactions between
* vendor partition processes and system partition processes.
* Previously this function checked if memfd is supported by checking if
* vendor VNDK version is greater than Q. As we can assume all treblelized
* device using this code is up to date enough to use memfd, memfd is allowed
* if the device is treblelized.
*/
static bool check_vendor_memfd_allowed() {
std::string vndk_version = android::base::GetProperty("ro.vndk.version", "");
static bool is_treblelized = android::base::GetBoolProperty("ro.treble.enabled", false);
if (vndk_version == "") {
ALOGE("memfd: ro.vndk.version not defined or invalid (%s), this is mandated since P.\n",
vndk_version.c_str());
return false;
}
/* No issues if vendor is targetting current Dessert */
if (vndk_version == "current") {
return false;
}
/* Check if VNDK version is a number and act on it */
char* p;
long int vers = strtol(vndk_version.c_str(), &p, 10);
if (*p == 0) {
if (vers < MIN_MEMFD_VENDOR_API_LEVEL) {
ALOGI("memfd: device VNDK version (%s) is < Q so using ashmem.\n",
vndk_version.c_str());
return false;
}
return true;
}
// Non-numeric should be a single ASCII character. Characters after the
// first are ignored.
if (tolower(vndk_version[0]) < 'a' || tolower(vndk_version[0]) > 'z') {
ALOGE("memfd: ro.vndk.version not defined or invalid (%s), this is mandated since P.\n",
vndk_version.c_str());
return false;
}
if (tolower(vndk_version[0]) < tolower(MIN_MEMFD_VENDOR_API_LEVEL_CHAR)) {
ALOGI("memfd: device is using VNDK version (%s) which is less than Q. Use ashmem only.\n",
vndk_version.c_str());
return false;
}
return true;
return is_treblelized;
}
/* Determine if memfd can be supported. This is just one-time hardwork
* which will be cached by the caller.
*/