Commit d088d664 authored by Aurelien Jarno's avatar Aurelien Jarno
Browse files

linux-user: identify running binary in /proc/self/exe 



Some applications like to test /proc/self/exe to find
out who they are. Fake the result of readlink() for
them. Use realpath() to return full path to binary
(which the links /proc/self/exe are)

Signed-off-by: default avatarRiku Voipio <riku.voipio@iki.fi>
Signed-off-by: default avatarAurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6485 c046a42c-6fe2-441c-8c8c-71466251a162
parent 04a6dfeb

linux-user/main.c

+3 −0
Original line number Diff line number Diff line
@@ -37,6 +37,8 @@ 


#define DEBUG_LOGFILE "/tmp/qemu.log"



char *exec_path;



static const char *interp_prefix = CONFIG_QEMU_PREFIX;

const char *qemu_uname_release = CONFIG_UNAME_RELEASE;
@@ -2341,6 +2343,7 @@ int main(int argc, char **argv, char **envp) 
    if (optind >= argc)

        usage();

    filename = argv[optind];

    exec_path = argv[optind];



    /* Zero out regs */

    memset(regs, 0, sizeof(struct target_pt_regs));

linux-user/qemu.h

+1 −0
Original line number Diff line number Diff line
@@ -120,6 +120,7 @@ typedef struct TaskState { 
    uint8_t stack[0];

} __attribute__((aligned(16))) TaskState;



extern char *exec_path;

void init_task_state(TaskState *ts);

extern const char *qemu_uname_release;

linux-user/syscall.c

+12 −3
Original line number Diff line number Diff line
@@ -4410,13 +4410,22 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, 
#endif

    case TARGET_NR_readlink:

        {

            void *p2;

            void *p2, *temp;

            p = lock_user_string(arg1);

            p2 = lock_user(VERIFY_WRITE, arg2, arg3, 0);

            if (!p || !p2)

                ret = -TARGET_EFAULT;

            else {

                if (strncmp((const char *)p, "/proc/self/exe", 14) == 0) {

                    char real[PATH_MAX];

                    temp = realpath(exec_path,real);

                    ret = (temp==NULL) ? get_errno(-1) : strlen(real) ;

                    snprintf((char *)p2, arg3, "%s", real);

                    }

                else

                    ret = get_errno(readlink(path(p), p2, arg3));

                break;

            }

            unlock_user(p2, arg2, ret);

            unlock_user(p, arg1, 0);

        }