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Commit b7c0e159 authored by Tri Vo's avatar Tri Vo Committed by Automerger Merge Worker
Browse files

Merge "storageproxyd: Remove setuid, setgid, and capset" am: 6a058f49 

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2154998



Change-Id: Ib6e423f0a9a7af64b71877b056669e779c30eef8
Signed-off-by: default avatarAutomerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
parents c57557ba 6a058f49

trusty/storage/proxy/proxy.c

+5 −45
Original line number Diff line number Diff line
@@ -70,49 +70,6 @@ static void show_usage_and_exit(int code) { 
    exit(code);

}



static int drop_privs(void) {

    struct __user_cap_header_struct capheader;

    struct __user_cap_data_struct capdata[2];



    if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) < 0) {

        return -1;

    }



    /*

     * ensure we're running as the system user

     */

    if (setgid(AID_SYSTEM) != 0) {

        return -1;

    }



    if (setuid(AID_SYSTEM) != 0) {

        return -1;

    }



    /*

     * drop all capabilities except SYS_RAWIO

     */

    memset(&capheader, 0, sizeof(capheader));

    memset(&capdata, 0, sizeof(capdata));

    capheader.version = _LINUX_CAPABILITY_VERSION_3;

    capheader.pid = 0;



    capdata[CAP_TO_INDEX(CAP_SYS_RAWIO)].permitted = CAP_TO_MASK(CAP_SYS_RAWIO);

    capdata[CAP_TO_INDEX(CAP_SYS_RAWIO)].effective = CAP_TO_MASK(CAP_SYS_RAWIO);



    if (capset(&capheader, &capdata[0]) < 0) {

        return -1;

    }



    /*

     * No access for group and other. We need execute access for user to create

     * an accessible directory.

     */

    umask(S_IRWXG | S_IRWXO);



    return 0;

}



static int handle_req(struct storage_msg* msg, const void* req, size_t req_len) {

    int rc;
@@ -260,8 +217,11 @@ static void parse_args(int argc, char* argv[]) { 
int main(int argc, char* argv[]) {

    int rc;



    /* drop privileges */

    if (drop_privs() < 0) return EXIT_FAILURE;

    /*

     * No access for group and other. We need execute access for user to create

     * an accessible directory.

     */

    umask(S_IRWXG | S_IRWXO);



    /* parse arguments */

    parse_args(argc, argv);