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bios-tables-test: handle false-positive smbios signature matches

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It has been reported that sometimes the .rodata section of SeaBIOS,
containing the constant string against which the SMBIOS signature
ends up being compared, also falls within the guest f-segment. In
that case, the test obviously fails, unless we continue searching
for the *real* SMBIOS entry point.

Rather than stopping at the first match for the SMBIOS signature
("_SM_") in the f-segment (0xF0000-0xFFFFF), continue scanning
until either a valid entry point table is found, or the f-segment
has been exhausted.

Reported-by: Bruce Rogers <brogers@suse.com>
Signed-off-by: Gabriel Somlo <somlo@cmu.edu>
Tested-by: Bruce Rogers <brogers@suse.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gabriel L. Somlo 2015-05-18 08:47:24 -04:00 committed by Gerd Hoffmann
parent 81b2b81062
commit 5efed5a172
1 changed files with 45 additions and 33 deletions
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78
tests/bios-tables-test.c
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@ -599,7 +599,45 @@ static void test_acpi_asl(test_data *data)
free_test_data(&exp_data);
}
static void test_smbios_ep_address(test_data *data)
static bool smbios_ep_table_ok(test_data *data)
{
struct smbios_entry_point *ep_table = &data->smbios_ep_table;
uint32_t addr = data->smbios_ep_addr;
ACPI_READ_ARRAY(ep_table->anchor_string, addr);
if (memcmp(ep_table->anchor_string, "_SM_", 4)) {
return false;
}
ACPI_READ_FIELD(ep_table->checksum, addr);
ACPI_READ_FIELD(ep_table->length, addr);
ACPI_READ_FIELD(ep_table->smbios_major_version, addr);
ACPI_READ_FIELD(ep_table->smbios_minor_version, addr);
ACPI_READ_FIELD(ep_table->max_structure_size, addr);
ACPI_READ_FIELD(ep_table->entry_point_revision, addr);
ACPI_READ_ARRAY(ep_table->formatted_area, addr);
ACPI_READ_ARRAY(ep_table->intermediate_anchor_string, addr);
if (memcmp(ep_table->intermediate_anchor_string, "_DMI_", 5)) {
return false;
}
ACPI_READ_FIELD(ep_table->intermediate_checksum, addr);
ACPI_READ_FIELD(ep_table->structure_table_length, addr);
if (ep_table->structure_table_length == 0) {
return false;
}
ACPI_READ_FIELD(ep_table->structure_table_address, addr);
ACPI_READ_FIELD(ep_table->number_of_structures, addr);
if (ep_table->number_of_structures == 0) {
return false;
}
ACPI_READ_FIELD(ep_table->smbios_bcd_revision, addr);
if (acpi_checksum((uint8_t *)ep_table, sizeof *ep_table) ||
acpi_checksum((uint8_t *)ep_table + 0x10, sizeof *ep_table - 0x10)) {
return false;
}
return true;
}
static void test_smbios_entry_point(test_data *data)
{
uint32_t off;
@ -613,40 +651,15 @@ static void test_smbios_ep_address(test_data *data)
}
if (!memcmp(sig, "_SM_", sizeof sig)) {
break;
/* signature match, but is this a valid entry point? */
data->smbios_ep_addr = off;
if (smbios_ep_table_ok(data)) {
break;
}
}
}
g_assert_cmphex(off, <, 0x100000);
data->smbios_ep_addr = off;
}
static void test_smbios_ep_table(test_data *data)
{
struct smbios_entry_point *ep_table = &data->smbios_ep_table;
uint32_t addr = data->smbios_ep_addr;
ACPI_READ_ARRAY(ep_table->anchor_string, addr);
g_assert(!memcmp(ep_table->anchor_string, "_SM_", 4));
ACPI_READ_FIELD(ep_table->checksum, addr);
ACPI_READ_FIELD(ep_table->length, addr);
ACPI_READ_FIELD(ep_table->smbios_major_version, addr);
ACPI_READ_FIELD(ep_table->smbios_minor_version, addr);
ACPI_READ_FIELD(ep_table->max_structure_size, addr);
ACPI_READ_FIELD(ep_table->entry_point_revision, addr);
ACPI_READ_ARRAY(ep_table->formatted_area, addr);
ACPI_READ_ARRAY(ep_table->intermediate_anchor_string, addr);
g_assert(!memcmp(ep_table->intermediate_anchor_string, "_DMI_", 5));
ACPI_READ_FIELD(ep_table->intermediate_checksum, addr);
ACPI_READ_FIELD(ep_table->structure_table_length, addr);
g_assert_cmpuint(ep_table->structure_table_length, >, 0);
ACPI_READ_FIELD(ep_table->structure_table_address, addr);
ACPI_READ_FIELD(ep_table->number_of_structures, addr);
g_assert_cmpuint(ep_table->number_of_structures, >, 0);
ACPI_READ_FIELD(ep_table->smbios_bcd_revision, addr);
g_assert(!acpi_checksum((uint8_t *)ep_table, sizeof *ep_table));
g_assert(!acpi_checksum((uint8_t *)ep_table + 0x10,
sizeof *ep_table - 0x10));
}
static inline bool smbios_single_instance(uint8_t type)
@ -767,8 +780,7 @@ static void test_acpi_one(const char *params, test_data *data)
}
}
test_smbios_ep_address(data);
test_smbios_ep_table(data);
test_smbios_entry_point(data);
test_smbios_structs(data);
qtest_quit(global_qtest);