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Revert "hw/elf_ops: Ignore loadable segments with zero size"

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This regressed qemu-system-xtensa:

    TEST    test_load_store on xtensa
  qemu-system-xtensa: Some ROM regions are overlapping
  These ROM regions might have been loaded by direct user request or by default.
  They could be BIOS/firmware images, a guest kernel, initrd or some other file loaded into guest memory.
  Check whether you intended to load all this guest code, and whether it has been built to load to the correct addresses.

  The following two regions overlap (in the memory address space):
    test_load_store ELF program header segment 1 (addresses 0x0000000000001000 - 0x0000000000001f26)
    test_load_store ELF program header segment 2 (addresses 0x0000000000001ab8 - 0x0000000000001ab8)
  make[1]: *** [Makefile:187: run-test_load_store] Error 1

This reverts commit 62570f1434.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240207163812.3231697-5-alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée 2024-02-07 16:38:02 +00:00
parent 15cc103362
commit 1fed4cd04d
1 changed files with 34 additions and 37 deletions
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71
include/hw/elf_ops.h
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@ -427,16 +427,6 @@ static ssize_t glue(load_elf, SZ)(const char *name, int fd,
file_size = ph->p_filesz; /* Size of the allocated data */
data_offset = ph->p_offset; /* Offset where the data is located */
/*
* Some ELF files really do have segments of zero size;
* just ignore them rather than trying to set the wrong addr,
* or create empty ROM blobs, because the zero-length blob can
* falsely trigger the overlapping-ROM-blobs check.
*/
if (mem_size == 0) {
continue;
}
if (file_size > 0) {
if (g_mapped_file_get_length(mapped_file) <
file_size + data_offset) {
@ -540,38 +530,45 @@ static ssize_t glue(load_elf, SZ)(const char *name, int fd,
*pentry = ehdr.e_entry - ph->p_vaddr + ph->p_paddr;
}
if (load_rom) {
g_autofree char *label =
g_strdup_printf("%s ELF program header segment %d",
name, i);
/* Some ELF files really do have segments of zero size;
* just ignore them rather than trying to create empty
* ROM blobs, because the zero-length blob can falsely
* trigger the overlapping-ROM-blobs check.
*/
if (mem_size != 0) {
if (load_rom) {
g_autofree char *label =
g_strdup_printf("%s ELF program header segment %d",
name, i);
/*
* rom_add_elf_program() takes its own reference to
* 'mapped_file'.
*/
rom_add_elf_program(label, mapped_file, data, file_size,
mem_size, addr, as);
} else {
MemTxResult res;
/*
* rom_add_elf_program() takes its own reference to
* 'mapped_file'.
*/
rom_add_elf_program(label, mapped_file, data, file_size,
mem_size, addr, as);
} else {
MemTxResult res;
res = address_space_write(as ? as : &address_space_memory,
addr, MEMTXATTRS_UNSPECIFIED,
data, file_size);
if (res != MEMTX_OK) {
goto fail;
}
/*
* We need to zero'ify the space that is not copied
* from file
*/
if (file_size < mem_size) {
res = address_space_set(as ? as : &address_space_memory,
addr + file_size, 0,
mem_size - file_size,
MEMTXATTRS_UNSPECIFIED);
res = address_space_write(as ? as : &address_space_memory,
addr, MEMTXATTRS_UNSPECIFIED,
data, file_size);
if (res != MEMTX_OK) {
goto fail;
}
/*
* We need to zero'ify the space that is not copied
* from file
*/
if (file_size < mem_size) {
res = address_space_set(as ? as : &address_space_memory,
addr + file_size, 0,
mem_size - file_size,
MEMTXATTRS_UNSPECIFIED);
if (res != MEMTX_OK) {
goto fail;
}
}
}
}