File 0026-linux-user_fake-some-_proc_self-entries.patch of Package qemu

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File 0026-linux-user_fake-some-_proc_self-entries.patch of Package qemu (Revision d9cfd8d295967674ccef7545daf92402)

Currently displaying revision d9cfd8d295967674ccef7545daf92402 , Show latest

diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 8677bba..2a1adf1 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -1246,6 +1246,7 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
                                    struct image_info *interp_info)
 {
     abi_ulong sp;
+    abi_ulong sp_auxv;
     int size;
     int i;
     abi_ulong u_rand_bytes;
@@ -1317,6 +1318,7 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
         sp -= n; put_user_ual(id, sp);          \
     } while(0)
 
+    sp_auxv = sp;
     NEW_AUX_ENT (AT_NULL, 0);
 
     /* There must be exactly DLINFO_ITEMS entries here.  */
@@ -1347,6 +1349,7 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
 #undef NEW_AUX_ENT
 
     info->saved_auxv = sp;
+    info->auxv_len = sp_auxv - sp;
 
     sp = loader_build_argptr(envc, argc, sp, p, 0);
     return sp;
@@ -2330,9 +2333,8 @@ static void fill_auxv_note(struct memelfnote *note, const TaskState *ts)
 {
     elf_addr_t auxv = (elf_addr_t)ts->info->saved_auxv;
     elf_addr_t orig_auxv = auxv;
-    abi_ulong val;
     void *ptr;
-    int i, len;
+    int len = ts->info->auxv_len;
 
     /*
      * Auxiliary vector is stored in target process stack.  It contains
@@ -2340,15 +2342,6 @@ static void fill_auxv_note(struct memelfnote *note, const TaskState *ts)
      * strictly necessary but we do it here for sake of completeness.
      */
 
-    /* find out lenght of the vector, AT_NULL is terminator */
-    i = len = 0;
-    do {
-        get_user_ual(val, auxv);
-        i += 2;
-        auxv += 2 * sizeof (elf_addr_t);
-    } while (val != AT_NULL);
-    len = i * sizeof (elf_addr_t);
-
     /* read in whole auxv vector and copy it to memelfnote */
     ptr = lock_user(VERIFY_READ, orig_auxv, len, 0);
     if (ptr != NULL) {
diff --git a/linux-user/qemu.h b/linux-user/qemu.h
index 55ad9d8..ef08d39 100644
--- a/linux-user/qemu.h
+++ b/linux-user/qemu.h
@@ -48,6 +48,7 @@ struct image_info {
         abi_ulong       code_offset;
         abi_ulong       data_offset;
         abi_ulong       saved_auxv;
+        abi_ulong       auxv_len;
         abi_ulong       arg_start;
         abi_ulong       arg_end;
 	int		personality;
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 7735008..e71550c 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -4608,6 +4608,125 @@ int get_osversion(void)
     return osversion;
 }
 
+
+static int open_self_maps(void *cpu_env, int fd)
+{
+#if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_UNICORE32)
+    TaskState *ts = ((CPUState *)cpu_env)->opaque;
+
+    dprintf(fd, "%08llx-%08llx rw-p %08llx 00:00 0          [stack]\n",
+                (unsigned long long)ts->info->stack_limit,
+                (unsigned long long)(ts->stack_base + (TARGET_PAGE_SIZE - 1))
+                                     & TARGET_PAGE_MASK,
+                (unsigned long long)ts->stack_base);
+#endif
+
+    return 0;
+}
+
+static int open_self_stat(void *cpu_env, int fd)
+{
+    TaskState *ts = ((CPUState *)cpu_env)->opaque;
+    abi_ulong start_stack = ts->info->start_stack;
+    int i;
+
+    for (i = 0; i < 44; i++) {
+      char buf[128];
+      int len;
+      uint64_t val = 0;
+
+      if (i == 27) {
+          /* stack bottom */
+          val = start_stack;
+      }
+      snprintf(buf, sizeof(buf), "%"PRId64 "%c", val, i == 43 ? '\n' : ' ');
+      len = strlen(buf);
+      if (write(fd, buf, len) != len) {
+          return -1;
+      }
+    }
+
+    return 0;
+}
+
+static int open_self_auxv(void *cpu_env, int fd)
+{
+    TaskState *ts = ((CPUState *)cpu_env)->opaque;
+    abi_ulong auxv = ts->info->saved_auxv;
+    abi_ulong len = ts->info->auxv_len;
+    char *ptr;
+
+    /*
+     * Auxiliary vector is stored in target process stack.
+     * read in whole auxv vector and copy it to file
+     */
+    ptr = lock_user(VERIFY_READ, auxv, len, 0);
+    if (ptr != NULL) {
+        while (len > 0) {
+            ssize_t r;
+            r = write(fd, ptr, len);
+            if (r <= 0) {
+                break;
+            }
+            len -= r;
+            ptr += r;
+        }
+        lseek(fd, 0, SEEK_SET);
+        unlock_user(ptr, auxv, len);
+    }
+
+    return 0;
+}
+
+static int do_open(void *cpu_env, const char *pathname, int flags, mode_t mode)
+{
+    struct fake_open {
+        const char *filename;
+        int (*fill)(void *cpu_env, int fd);
+    };
+    const struct fake_open *fake_open;
+    static const struct fake_open fakes[] = {
+        { "/proc/self/maps", open_self_maps },
+        { "/proc/self/stat", open_self_stat },
+        { "/proc/self/auxv", open_self_auxv },
+        { NULL, NULL }
+    };
+
+    for (fake_open = fakes; fake_open->filename; fake_open++) {
+        if (!strncmp(pathname, fake_open->filename,
+                     strlen(fake_open->filename))) {
+            break;
+        }
+    }
+
+    if (fake_open->filename) {
+        const char *tmpdir;
+        char filename[PATH_MAX];
+        int fd, r;
+
+        /* create temporary file to map stat to */
+        tmpdir = getenv("TMPDIR");
+        if (!tmpdir)
+            tmpdir = "/tmp";
+        snprintf(filename, sizeof(filename), "%s/qemu-open.XXXXXX", tmpdir);
+        fd = mkstemp(filename);
+        if (fd < 0) {
+            return fd;
+        }
+        unlink(filename);
+
+        if ((r = fake_open->fill(cpu_env, fd))) {
+            close(fd);
+            return r;
+        }
+        lseek(fd, 0, SEEK_SET);
+
+        return fd;
+    }
+
+    return get_errno(open(path(pathname), flags, mode));
+}
+
 /* do_syscall() should always have a single exit point at the end so
    that actions, such as logging of syscall results, can be performed.
    All errnos that do_syscall() returns must be -TARGET_<errcode>. */
@@ -4693,9 +4812,9 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
     case TARGET_NR_open:
         if (!(p = lock_user_string(arg1)))
             goto efault;
-        ret = get_errno(open(path(p),
-                             target_to_host_bitmask(arg2, fcntl_flags_tbl),
-                             arg3));
+        ret = get_errno(do_open(cpu_env, p,
+                                target_to_host_bitmask(arg2, fcntl_flags_tbl),
+                                arg3));
         unlock_user(p, arg1, 0);
         break;
 #if defined(TARGET_NR_openat) && defined(__NR_openat)
@@ -5937,6 +6056,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
             if ((arg3 & PROT_GROWSDOWN)
                 && arg1 >= ts->info->stack_limit
                 && arg1 <= ts->info->start_stack) {
+typedef struct sPAPREnvironment sPAPREnvironment;
                 arg3 &= ~PROT_GROWSDOWN;
                 arg2 = arg2 + arg1 - ts->info->stack_limit;
                 arg1 = ts->info->stack_limit;

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File 0026-linux-user_fake-some-_proc_self-entries.patch of Package qemu (Revision d9cfd8d295967674ccef7545daf92402)

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