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dissect: complain if partition flags are set that we don't know

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This commit is contained in:
Lennart Poettering 2020-01-29 18:08:36 +01:00
parent a44956c94a
commit 0f7c9a3d81
2 changed files with 47 additions and 0 deletions
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45
src/shared/dissect-image.c
View File

@ -278,6 +278,29 @@ static int loop_wait_for_partitions_to_appear(
N_DEVICE_NODE_LIST_ATTEMPTS);
}
static void check_partition_flags(
const char *node,
unsigned long long pflags,
unsigned long long supported) {
assert(node);
/* Mask away all flags supported by this partition's type and the three flags the UEFI spec defines generically */
pflags &= ~(supported | GPT_FLAG_REQUIRED_PARTITION | GPT_FLAG_NO_BLOCK_IO_PROTOCOL | GPT_FLAG_LEGACY_BIOS_BOOTABLE);
if (pflags == 0)
return;
/* If there are other bits set, then log about it, to make things discoverable */
for (unsigned i = 0; i < sizeof(pflags) * 8; i++) {
unsigned long long bit = 1ULL << i;
if (!FLAGS_SET(pflags, bit))
continue;
log_debug("Unexpected partition flag %llu set on %s!", bit, node);
}
}
#endif
int dissect_image(
@ -484,6 +507,8 @@ int dissect_image(
if (sd_id128_equal(type_id, GPT_HOME)) {
check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
if (pflags & GPT_FLAG_NO_AUTO)
continue;
@ -491,6 +516,8 @@ int dissect_image(
rw = !(pflags & GPT_FLAG_READ_ONLY);
} else if (sd_id128_equal(type_id, GPT_SRV)) {
check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
if (pflags & GPT_FLAG_NO_AUTO)
continue;
@ -510,6 +537,8 @@ int dissect_image(
} else if (sd_id128_equal(type_id, GPT_XBOOTLDR)) {
check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
if (pflags & GPT_FLAG_NO_AUTO)
continue;
@ -519,6 +548,8 @@ int dissect_image(
#ifdef GPT_ROOT_NATIVE
else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) {
check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
if (pflags & GPT_FLAG_NO_AUTO)
continue;
@ -531,6 +562,8 @@ int dissect_image(
rw = !(pflags & GPT_FLAG_READ_ONLY);
} else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE_VERITY)) {
check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
if (pflags & GPT_FLAG_NO_AUTO)
continue;
@ -549,6 +582,8 @@ int dissect_image(
#ifdef GPT_ROOT_SECONDARY
else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) {
check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
if (pflags & GPT_FLAG_NO_AUTO)
continue;
@ -561,6 +596,8 @@ int dissect_image(
rw = !(pflags & GPT_FLAG_READ_ONLY);
} else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY_VERITY)) {
check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
if (pflags & GPT_FLAG_NO_AUTO)
continue;
@ -578,6 +615,8 @@ int dissect_image(
#endif
else if (sd_id128_equal(type_id, GPT_SWAP)) {
check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO);
if (pflags & GPT_FLAG_NO_AUTO)
continue;
@ -585,6 +624,8 @@ int dissect_image(
fstype = "swap";
} else if (sd_id128_equal(type_id, GPT_LINUX_GENERIC)) {
check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
if (pflags & GPT_FLAG_NO_AUTO)
continue;
@ -601,6 +642,8 @@ int dissect_image(
} else if (sd_id128_equal(type_id, GPT_TMP)) {
check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
if (pflags & GPT_FLAG_NO_AUTO)
continue;
@ -609,6 +652,8 @@ int dissect_image(
} else if (sd_id128_equal(type_id, GPT_VAR)) {
check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY);
if (pflags & GPT_FLAG_NO_AUTO)
continue;

2
src/shared/gpt.h
View File

@ -57,7 +57,9 @@
# define GPT_ROOT_NATIVE_VERITY GPT_ROOT_ARM_VERITY
#endif
#define GPT_FLAG_REQUIRED_PARTITION (1ULL << 0)
#define GPT_FLAG_NO_BLOCK_IO_PROTOCOL (1ULL << 1)
#define GPT_FLAG_LEGACY_BIOS_BOOTABLE (1ULL << 2)
/* Flags we recognize on the root, swap, home and srv partitions when
* doing auto-discovery. These happen to be identical to what