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migration: catch unknown flags in ram_load 

if a saved vm has unknown flags in the memory data qemu
currently simply ignores this flag and continues which
yields in an unpredictable result.

This patch catches all unknown flags and aborts the
loading of the vm. Additionally error reports are thrown
if the migration aborts abnormally.

Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Juan Quintela <quintela@redhat.com>
(cherry picked from commit db80facefa)

Conflicts:
	arch_init.c

*removed unecessary context from 4798fe55

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Peter Lieven 2014-06-10 11:29:16 +02:00 committed by Michael Roth
parent 3102b1a221
commit 69b7aacc01
2 changed files with 18 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
arch_init.c
View File

@ -857,7 +857,6 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id)
{
ram_addr_t addr;
int flags, ret = 0;
int error;
static uint64_t seq_iter;
seq_iter++;
@ -866,7 +865,7 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id)
return -EINVAL;
}
do {
while (!ret) {
addr = qemu_get_be64(f);
flags = addr & ~TARGET_PAGE_MASK;
@ -895,7 +894,6 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id)
" in != " RAM_ADDR_FMT "\n", id, length,
block->length);
ret = -EINVAL;
goto done;
}
break;
}
@ -905,14 +903,14 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id)
fprintf(stderr, "Unknown ramblock \"%s\", cannot "
"accept migration\n", id);
ret = -EINVAL;
goto done;
}
if (ret) {
break;
}
total_ram_bytes -= length;
}
}
if (flags & RAM_SAVE_FLAG_COMPRESS) {
} else if (flags & RAM_SAVE_FLAG_COMPRESS) {
void *host;
uint8_t ch;
@ -939,20 +937,24 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id)
}
if (load_xbzrle(f, addr, host) < 0) {
error_report("Failed to decompress XBZRLE page at "
RAM_ADDR_FMT, addr);
ret = -EINVAL;
goto done;
break;
}
} else if (flags & RAM_SAVE_FLAG_HOOK) {
ram_control_load_hook(f, flags);
} else if (flags & RAM_SAVE_FLAG_EOS) {
/* normal exit */
break;
} else {
error_report("Unknown migration flags: %#x", flags);
ret = -EINVAL;
break;
}
error = qemu_file_get_error(f);
if (error) {
ret = error;
goto done;
}
} while (!(flags & RAM_SAVE_FLAG_EOS));
ret = qemu_file_get_error(f);
}
done:
DPRINTF("Completed load of VM with exit code %d seq iteration "
"%" PRIu64 "\n", ret, seq_iter);
return ret;

2
migration.c
View File

@ -105,7 +105,7 @@ static void process_incoming_migration_co(void *opaque)
ret = qemu_loadvm_state(f);
qemu_fclose(f);
if (ret < 0) {
fprintf(stderr, "load of migration failed\n");
error_report("load of migration failed: %s", strerror(-ret));
exit(EXIT_FAILURE);
}
qemu_announce_self();