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hw/elf_ops: clear uninitialized segment space 

When the mem_size of the segment is bigger than the file_size,
and if this space doesn't overlap another segment, it needs
to be cleared.

This bug is very similar to the one we had for linux-user,
22d113b52f ("linux-user: Fix loading of BSS segments"),
where .bss section is encoded as an extension of the the data
one by setting the segment p_memsz > p_filesz.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
[PMD: Use recently added address_space_set()]
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220115203725.3834712-3-laurent@vivier.eu>
staging
Laurent Vivier 2022-01-15 21:37:24 +01:00
parent 75f01c68b5
commit b4c4c1f112
2 changed files with 17 additions and 0 deletions
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4
hw/core/loader.c
View File

@ -1164,9 +1164,13 @@ static void rom_reset(void *unused)
if (rom->mr) {
void *host = memory_region_get_ram_ptr(rom->mr);
memcpy(host, rom->data, rom->datasize);
memset(host + rom->datasize, 0, rom->romsize - rom->datasize);
} else {
address_space_write_rom(rom->as, rom->addr, MEMTXATTRS_UNSPECIFIED,
rom->data, rom->datasize);
address_space_set(rom->as, rom->addr + rom->datasize, 0,
rom->romsize - rom->datasize,
MEMTXATTRS_UNSPECIFIED);
}
if (rom->isrom) {
/* rom needs to be written only once */

13
include/hw/elf_ops.h
View File

@ -555,6 +555,19 @@ static ssize_t glue(load_elf, SZ)(const char *name, int fd,
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;
}
}
}
}