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Merge pull request #11578 from keszybz/gcc-9-fixes

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Packed struct alignment workarounds for gcc-9
This commit is contained in:
Lennart Poettering 2019-02-07 15:25:05 +01:00 committed by GitHub
commit eb7e351496
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GPG Key ID: 4AEE18F83AFDEB23
9 changed files with 212 additions and 141 deletions
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2
TODO
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@ -1114,3 +1114,5 @@ Regularly:
* use secure_getenv() instead of getenv() where appropriate
* link up selected blog stories from man pages and unit files Documentation= fields
String is not UTF-8 clean, ignoring assignment
timedatex.service: Consumed 26ms CPU time.

44
src/journal/catalog.c
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@ -46,7 +46,8 @@ typedef struct CatalogHeader {
typedef struct CatalogItem {
sd_id128_t id;
char language[32];
char language[32]; /* One byte is used for termination, so the maximum allowed
* length of the string is actually 31 bytes. */
le64_t offset;
} CatalogItem;
@ -556,25 +557,44 @@ static const char *find_id(void *p, sd_id128_t id) {
const char *loc;
loc = setlocale(LC_MESSAGES, NULL);
if (loc && loc[0] && !streq(loc, "C") && !streq(loc, "POSIX")) {
strncpy(key.language, loc, sizeof(key.language));
key.language[strcspn(key.language, ".@")] = 0;
if (!isempty(loc) && !STR_IN_SET(loc, "C", "POSIX")) {
size_t len;
f = bsearch(&key, (const uint8_t*) p + le64toh(h->header_size), le64toh(h->n_items), le64toh(h->catalog_item_size), (comparison_fn_t) catalog_compare_func);
if (!f) {
char *e;
len = strcspn(loc, ".@");
if (len > sizeof(key.language) - 1)
log_debug("LC_MESSAGES value too long, ignoring: \"%.*s\"", (int) len, loc);
else {
strncpy(key.language, loc, len);
key.language[len] = '\0';
e = strchr(key.language, '_');
if (e) {
*e = 0;
f = bsearch(&key, (const uint8_t*) p + le64toh(h->header_size), le64toh(h->n_items), le64toh(h->catalog_item_size), (comparison_fn_t) catalog_compare_func);
f = bsearch(&key,
(const uint8_t*) p + le64toh(h->header_size),
le64toh(h->n_items),
le64toh(h->catalog_item_size),
(comparison_fn_t) catalog_compare_func);
if (!f) {
char *e;
e = strchr(key.language, '_');
if (e) {
*e = 0;
f = bsearch(&key,
(const uint8_t*) p + le64toh(h->header_size),
le64toh(h->n_items),
le64toh(h->catalog_item_size),
(comparison_fn_t) catalog_compare_func);
}
}
}
}
if (!f) {
zero(key.language);
f = bsearch(&key, (const uint8_t*) p + le64toh(h->header_size), le64toh(h->n_items), le64toh(h->catalog_item_size), (comparison_fn_t) catalog_compare_func);
f = bsearch(&key,
(const uint8_t*) p + le64toh(h->header_size),
le64toh(h->n_items),
le64toh(h->catalog_item_size),
(comparison_fn_t) catalog_compare_func);
}
if (!f)

116
src/journal/journal-def.h
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@ -59,16 +59,20 @@ struct ObjectHeader {
uint8_t payload[];
} _packed_;
struct DataObject {
ObjectHeader object;
le64_t hash;
le64_t next_hash_offset;
le64_t next_field_offset;
le64_t entry_offset; /* the first array entry we store inline */
le64_t entry_array_offset;
le64_t n_entries;
uint8_t payload[];
} _packed_;
#define DataObject__contents { \
ObjectHeader object; \
le64_t hash; \
le64_t next_hash_offset; \
le64_t next_field_offset; \
le64_t entry_offset; /* the first array entry we store inline */ \
le64_t entry_array_offset; \
le64_t n_entries; \
uint8_t payload[]; \
}
struct DataObject DataObject__contents;
struct DataObject__packed DataObject__contents _packed_;
assert_cc(sizeof(struct DataObject) == sizeof(struct DataObject__packed));
struct FieldObject {
ObjectHeader object;
@ -83,15 +87,20 @@ struct EntryItem {
le64_t hash;
} _packed_;
struct EntryObject {
ObjectHeader object;
le64_t seqnum;
le64_t realtime;
le64_t monotonic;
sd_id128_t boot_id;
le64_t xor_hash;
EntryItem items[];
} _packed_;
#define EntryObject__contents { \
ObjectHeader object; \
le64_t seqnum; \
le64_t realtime; \
le64_t monotonic; \
sd_id128_t boot_id; \
le64_t xor_hash; \
EntryItem items[]; \
}
struct EntryObject EntryObject__contents;
struct EntryObject__packed EntryObject__contents _packed_;
assert_cc(sizeof(struct EntryObject) == sizeof(struct EntryObject__packed));
struct HashItem {
le64_t head_hash_offset;
@ -166,40 +175,43 @@ enum {
#define HEADER_SIGNATURE ((char[]) { 'L', 'P', 'K', 'S', 'H', 'H', 'R', 'H' })
struct Header {
uint8_t signature[8]; /* "LPKSHHRH" */
le32_t compatible_flags;
le32_t incompatible_flags;
uint8_t state;
uint8_t reserved[7];
sd_id128_t file_id;
sd_id128_t machine_id;
sd_id128_t boot_id; /* last writer */
sd_id128_t seqnum_id;
le64_t header_size;
le64_t arena_size;
le64_t data_hash_table_offset;
le64_t data_hash_table_size;
le64_t field_hash_table_offset;
le64_t field_hash_table_size;
le64_t tail_object_offset;
le64_t n_objects;
le64_t n_entries;
le64_t tail_entry_seqnum;
le64_t head_entry_seqnum;
le64_t entry_array_offset;
le64_t head_entry_realtime;
le64_t tail_entry_realtime;
le64_t tail_entry_monotonic;
/* Added in 187 */
le64_t n_data;
le64_t n_fields;
/* Added in 189 */
le64_t n_tags;
le64_t n_entry_arrays;
#define struct_Header__contents { \
uint8_t signature[8]; /* "LPKSHHRH" */ \
le32_t compatible_flags; \
le32_t incompatible_flags; \
uint8_t state; \
uint8_t reserved[7]; \
sd_id128_t file_id; \
sd_id128_t machine_id; \
sd_id128_t boot_id; /* last writer */ \
sd_id128_t seqnum_id; \
le64_t header_size; \
le64_t arena_size; \
le64_t data_hash_table_offset; \
le64_t data_hash_table_size; \
le64_t field_hash_table_offset; \
le64_t field_hash_table_size; \
le64_t tail_object_offset; \
le64_t n_objects; \
le64_t n_entries; \
le64_t tail_entry_seqnum; \
le64_t head_entry_seqnum; \
le64_t entry_array_offset; \
le64_t head_entry_realtime; \
le64_t tail_entry_realtime; \
le64_t tail_entry_monotonic; \
/* Added in 187 */ \
le64_t n_data; \
le64_t n_fields; \
/* Added in 189 */ \
le64_t n_tags; \
le64_t n_entry_arrays; \
}
/* Size: 240 */
} _packed_;
struct Header struct_Header__contents;
struct Header__packed struct_Header__contents _packed_;
assert_cc(sizeof(struct Header) == sizeof(struct Header__packed));
assert_cc(sizeof(struct Header) == 240);
#define FSS_HEADER_SIGNATURE ((char[]) { 'K', 'S', 'H', 'H', 'R', 'H', 'L', 'P' })

35
src/libsystemd-network/radv-internal.h
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@ -63,19 +63,34 @@ struct sd_radv {
struct sd_radv_opt_dns *dnssl;
};
#define radv_prefix_opt__contents { \
uint8_t type; \
uint8_t length; \
uint8_t prefixlen; \
uint8_t flags; \
be32_t valid_lifetime; \
be32_t preferred_lifetime; \
uint32_t reserved; \
struct in6_addr in6_addr; \
}
struct radv_prefix_opt radv_prefix_opt__contents;
/* We need the opt substructure to be packed, because we use it in send(). But
* if we use _packed_, this means that the structure cannot be used directly in
* normal code in general, because the fields might not be properly aligned.
* But in this particular case, the structure is defined in a way that gives
* proper alignment, even without the explicit _packed_ attribute. To appease
* the compiler we use the "unpacked" structure, but we also verify that
* structure contains no holes, so offsets are the same when _packed_ is used.
*/
struct radv_prefix_opt__packed radv_prefix_opt__contents _packed_;
assert_cc(sizeof(struct radv_prefix_opt) == sizeof(struct radv_prefix_opt__packed));
struct sd_radv_prefix {
unsigned n_ref;
struct {
uint8_t type;
uint8_t length;
uint8_t prefixlen;
uint8_t flags;
be32_t valid_lifetime;
be32_t preferred_lifetime;
uint32_t reserved;
struct in6_addr in6_addr;
} _packed_ opt;
struct radv_prefix_opt opt;
LIST_FIELDS(struct sd_radv_prefix, prefix);

4
src/shared/dissect-image.c
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@ -1178,7 +1178,6 @@ int dissected_image_decrypt_interactively(
#if HAVE_LIBCRYPTSETUP
static int deferred_remove(DecryptedPartition *p) {
struct dm_ioctl dm = {
.version = {
DM_VERSION_MAJOR,
@ -1199,6 +1198,9 @@ static int deferred_remove(DecryptedPartition *p) {
if (fd < 0)
return -errno;
if (strlen(p->name) > sizeof(dm.name))
return -ENAMETOOLONG;
strncpy(dm.name, p->name, sizeof(dm.name));
if (ioctl(fd, DM_DEV_REMOVE, &dm))

134
src/shared/efivars.c
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@ -40,11 +40,17 @@
#define END_ENTIRE_DEVICE_PATH_SUBTYPE 0xff
#define EFI_OS_INDICATIONS_BOOT_TO_FW_UI 0x0000000000000001
struct boot_option {
uint32_t attr;
uint16_t path_len;
uint16_t title[];
} _packed_;
#define boot_option__contents { \
uint32_t attr; \
uint16_t path_len; \
uint16_t title[]; \
}
struct boot_option boot_option__contents;
struct boot_option__packed boot_option__contents _packed_;
assert_cc(offsetof(struct boot_option, title) == offsetof(struct boot_option__packed, title));
/* sizeof(struct boot_option) != sizeof(struct boot_option__packed), so
* the *size* of the structure should not be used anywhere below. */
struct drive_path {
uint32_t part_nr;
@ -55,15 +61,19 @@ struct drive_path {
uint8_t signature_type;
} _packed_;
struct device_path {
uint8_t type;
uint8_t sub_type;
uint16_t length;
union {
uint16_t path[0];
struct drive_path drive;
};
} _packed_;
#define device_path__contents { \
uint8_t type; \
uint8_t sub_type; \
uint16_t length; \
union { \
uint16_t path[0]; \
struct drive_path drive; \
}; \
}
struct device_path device_path__contents;
struct device_path__packed device_path__contents _packed_;
assert_cc(sizeof(struct device_path) == sizeof(struct device_path__packed));
bool is_efi_boot(void) {
if (detect_container() > 0)
@ -354,32 +364,46 @@ int efi_set_variable_string(sd_id128_t vendor, const char *name, const char *v)
return efi_set_variable(vendor, name, u16, (char16_strlen(u16) + 1) * sizeof(char16_t));
}
static size_t utf16_size(const uint16_t *s) {
static ssize_t utf16_size(const uint16_t *s, size_t buf_len_bytes) {
size_t l = 0;
while (s[l] > 0)
l++;
/* Returns the size of the string in bytes without the terminating two zero bytes */
return (l+1) * sizeof(uint16_t);
if (buf_len_bytes % sizeof(uint16_t) != 0)
return -EINVAL;
while (l < buf_len_bytes / sizeof(uint16_t)) {
if (s[l] == 0)
return (l + 1) * sizeof(uint16_t);
l++;
}
return -EINVAL; /* The terminator was not found */
}
static void efi_guid_to_id128(const void *guid, sd_id128_t *id128) {
struct uuid {
uint32_t u1;
uint16_t u2;
uint16_t u3;
uint8_t u4[8];
} _packed_;
const struct uuid *uuid = guid;
struct guid {
uint32_t u1;
uint16_t u2;
uint16_t u3;
uint8_t u4[8];
} _packed_;
id128->bytes[0] = (uuid->u1 >> 24) & 0xff;
id128->bytes[1] = (uuid->u1 >> 16) & 0xff;
id128->bytes[2] = (uuid->u1 >> 8) & 0xff;
id128->bytes[3] = (uuid->u1) & 0xff;
id128->bytes[4] = (uuid->u2 >> 8) & 0xff;
id128->bytes[5] = (uuid->u2) & 0xff;
id128->bytes[6] = (uuid->u3 >> 8) & 0xff;
id128->bytes[7] = (uuid->u3) & 0xff;
static void efi_guid_to_id128(const void *guid, sd_id128_t *id128) {
uint32_t u1;
uint16_t u2, u3;
const struct guid *uuid = guid;
memcpy(&u1, &uuid->u1, sizeof(uint32_t));
id128->bytes[0] = (u1 >> 24) & 0xff;
id128->bytes[1] = (u1 >> 16) & 0xff;
id128->bytes[2] = (u1 >> 8) & 0xff;
id128->bytes[3] = u1 & 0xff;
memcpy(&u2, &uuid->u2, sizeof(uint16_t));
id128->bytes[4] = (u2 >> 8) & 0xff;
id128->bytes[5] = u2 & 0xff;
memcpy(&u3, &uuid->u3, sizeof(uint16_t));
id128->bytes[6] = (u3 >> 8) & 0xff;
id128->bytes[7] = u3 & 0xff;
memcpy(&id128->bytes[8], uuid->u4, sizeof(uuid->u4));
}
@ -394,7 +418,7 @@ int efi_get_boot_option(
_cleanup_free_ uint8_t *buf = NULL;
size_t l;
struct boot_option *header;
size_t title_size;
ssize_t title_size;
_cleanup_free_ char *s = NULL, *p = NULL;
sd_id128_t p_uuid = SD_ID128_NULL;
int r;
@ -406,13 +430,13 @@ int efi_get_boot_option(
r = efi_get_variable(EFI_VENDOR_GLOBAL, boot_id, NULL, (void **)&buf, &l);
if (r < 0)
return r;
if (l < sizeof(struct boot_option))
if (l < offsetof(struct boot_option, title))
return -ENOENT;
header = (struct boot_option *)buf;
title_size = utf16_size(header->title);
if (title_size > l - offsetof(struct boot_option, title))
return -EINVAL;
title_size = utf16_size(header->title, l - offsetof(struct boot_option, title));
if (title_size < 0)
return title_size;
if (title) {
s = utf16_to_utf8(header->title, title_size);
@ -494,20 +518,14 @@ static void to_utf16(uint16_t *dest, const char *src) {
dest[i] = '\0';
}
struct guid {
uint32_t u1;
uint16_t u2;
uint16_t u3;
uint8_t u4[8];
} _packed_;
static void id128_to_efi_guid(sd_id128_t id, void *guid) {
struct guid *uuid = guid;
uuid->u1 = id.bytes[0] << 24 | id.bytes[1] << 16 | id.bytes[2] << 8 | id.bytes[3];
uuid->u2 = id.bytes[4] << 8 | id.bytes[5];
uuid->u3 = id.bytes[6] << 8 | id.bytes[7];
memcpy(uuid->u4, id.bytes+8, sizeof(uuid->u4));
struct guid uuid = {
.u1 = id.bytes[0] << 24 | id.bytes[1] << 16 | id.bytes[2] << 8 | id.bytes[3],
.u2 = id.bytes[4] << 8 | id.bytes[5],
.u3 = id.bytes[6] << 8 | id.bytes[7],
};
memcpy(uuid.u4, id.bytes+8, sizeof(uuid.u4));
memcpy(guid, &uuid, sizeof(uuid));
}
static uint16_t *tilt_slashes(uint16_t *s) {
@ -541,7 +559,7 @@ int efi_add_boot_option(
title_len = (strlen(title)+1) * 2;
path_len = (strlen(path)+1) * 2;
buf = malloc0(sizeof(struct boot_option) + title_len +
buf = malloc0(offsetof(struct boot_option, title) + title_len +
sizeof(struct drive_path) +
sizeof(struct device_path) + path_len);
if (!buf)
@ -561,12 +579,12 @@ int efi_add_boot_option(
devicep->type = MEDIA_DEVICE_PATH;
devicep->sub_type = MEDIA_HARDDRIVE_DP;
devicep->length = offsetof(struct device_path, drive) + sizeof(struct drive_path);
devicep->drive.part_nr = part;
devicep->drive.part_start = pstart;
devicep->drive.part_size = psize;
devicep->drive.signature_type = SIGNATURE_TYPE_GUID;
devicep->drive.mbr_type = MBR_TYPE_EFI_PARTITION_TABLE_HEADER;
memcpy(&devicep->drive.part_nr, &part, sizeof(uint32_t));
memcpy(&devicep->drive.part_start, &pstart, sizeof(uint64_t));
memcpy(&devicep->drive.part_size, &psize, sizeof(uint64_t));
id128_to_efi_guid(part_uuid, devicep->drive.signature);
devicep->drive.mbr_type = MBR_TYPE_EFI_PARTITION_TABLE_HEADER;
devicep->drive.signature_type = SIGNATURE_TYPE_GUID;
size += devicep->length;
/* path to loader */

3
src/test/meson.build
View File

@ -929,7 +929,8 @@ tests += [
[['src/libsystemd/sd-resolve/test-resolve.c'],
[],
[threads]],
[threads],
'', 'timeout=120'],
[['src/libsystemd/sd-login/test-login.c'],
[],

11
src/test/test-sizeof.c
View File

@ -13,11 +13,12 @@
#pragma GCC diagnostic ignored "-Wtype-limits"
#define info(t) \
printf("%s → %zu bits%s\n", STRINGIFY(t), \
sizeof(t)*CHAR_BIT, \
strstr(STRINGIFY(t), "signed") ? "" : \
((t)-1 < (t)0 ? ", signed" : ", unsigned"));
#define info(t) \
printf("%s → %zu bits%s, %zu byte alignment\n", STRINGIFY(t), \
sizeof(t)*CHAR_BIT, \
strstr(STRINGIFY(t), "signed") ? "" : \
(t)-1 < (t)0 ? ", signed" : ", unsigned", \
__alignof__(t))
enum Enum {
enum_value,

4
src/test/test-util.c
View File

@ -139,11 +139,11 @@ static void test_container_of(void) {
uint64_t v1;
uint8_t pad2[2];
uint32_t v2;
} _packed_ myval = { };
} myval = { };
log_info("/* %s */", __func__);
assert_cc(sizeof(myval) == 17);
assert_cc(sizeof(myval) >= 17);
assert_se(container_of(&myval.v1, struct mytype, v1) == &myval);
assert_se(container_of(&myval.v2, struct mytype, v2) == &myval);
assert_se(container_of(&container_of(&myval.v2,