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[Qemu-devel] S390: file size checking in load_image_targphys and certain

From: Christian Borntraeger
Subject: [Qemu-devel] S390: file size checking in load_image_targphys and certain ram sizes
Date: Thu, 03 May 2012 15:36:17 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:11.0) Gecko/20120412 Thunderbird/11.0.1

Ben, Alex,

commit 17df768c1e4580f03301d18ea938d3557d441911
    load_image_targphys() should enforce the max size

caused some problems with external kernel and specific ram sizes on s390:

We load the external kernel with

            kernel_size = load_image_targphys(kernel_filename, 0, ram_size);

The problem is now, that load_image_targphys has max_sz as an int (32bit), but 
ram_size is a ram_addr_t (64bit).
So for a ramsize of lets say 3GB the comparison in load_image_targphys fails:

    if (size > max_sz) {
        return -1;

There are several potential ways of solving, suggestions for a better solution
than the patch below are welcome.

diff --git a/hw/loader.c b/hw/loader.c
index 415cdce..8a6c99d 100644
--- a/hw/loader.c
+++ b/hw/loader.c
@@ -103,7 +103,7 @@ ssize_t read_targphys(const char *name,
 /* return the size or -1 if error */
 int load_image_targphys(const char *filename,
-                       target_phys_addr_t addr, int max_sz)
+                       target_phys_addr_t addr, uint64_t max_sz)
     int size;
diff --git a/hw/loader.h b/hw/loader.h
index fbcaba9..5cfa6df 100644
--- a/hw/loader.h
+++ b/hw/loader.h
@@ -4,7 +4,7 @@
 /* loader.c */
 int get_image_size(const char *filename);
 int load_image(const char *filename, uint8_t *addr); /* deprecated */
-int load_image_targphys(const char *filename, target_phys_addr_t, int max_sz);
+int load_image_targphys(const char *filename, target_phys_addr_t, uint64_t);
 int load_elf(const char *filename, uint64_t (*translate_fn)(void *, uint64_t),
              void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
              uint64_t *highaddr, int big_endian, int elf_machine,

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