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Commit 19c054cc authored by Treehugger Robot's avatar Treehugger Robot Committed by Automerger Merge Worker
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Merge "Do not check with vendor vndk version" into main am: 6d01651a am:... 

Merge "Do not check with vendor vndk version" into main am: 6d01651a am: 9062abf0 am: fcdbce7f am: 3147ebc6 am: b94f5ee9

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



Change-Id: I6380bec21baec416a9e9bd53b8e88610447d5db7
Signed-off-by: default avatarAutomerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
parents 7318616f b94f5ee9

libcutils/ashmem-dev.cpp

+6 −51
Original line number Diff line number Diff line
@@ -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", "");



    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;

    }

    static bool is_treblelized = android::base::GetBoolProperty("ro.treble.enabled", 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 is_treblelized;

}



        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;

}





/* Determine if memfd can be supported. This is just one-time hardwork

 * which will be cached by the caller.

 */