X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fshared%2Fefivars.c;h=000dae9de0fd0f389823d7339ea638b8165c45f6;hp=784ff364d9802c621774f256527f205e1c13ce12;hb=fdb9161cd3e1a64eb9a653a6bf69596670d6e942;hpb=34e5a31ec5897de8ba1436dad53df99637569d0a

diff --git a/src/shared/efivars.c b/src/shared/efivars.c
index 784ff364d..000dae9de 100644
--- a/src/shared/efivars.c
+++ b/src/shared/efivars.c
@@ -20,19 +20,54 @@
 ***/
 
 #include <unistd.h>
+#include <string.h>
 #include <fcntl.h>
+#include <ctype.h>
 
+#include "acpi-fpdt.h"
 #include "util.h"
 #include "utf8.h"
 #include "efivars.h"
 
-#define EFI_VENDOR_LOADER SD_ID128_MAKE(4a,67,b0,82,0a,4c,41,cf,b6,c7,44,0b,29,bb,8c,4f)
+#ifdef ENABLE_EFI
 
-bool is_efiboot(void) {
+bool is_efi_boot(void) {
         return access("/sys/firmware/efi", F_OK) >= 0;
 }
 
-int efi_get_variable(sd_id128_t vendor, const char *name, uint32_t *attribute, void **value, size_t *size) {
+static int read_flag(const char *varname) {
+        int r;
+        _cleanup_free_ void *v = NULL;
+        size_t s;
+        uint8_t b;
+
+        r = efi_get_variable(EFI_VENDOR_GLOBAL, varname, NULL, &v, &s);
+        if (r < 0)
+                return r;
+
+        if (s != 1)
+                return -EINVAL;
+
+        b = *(uint8_t *)v;
+        r = b > 0;
+        return r;
+}
+
+int is_efi_secure_boot(void) {
+        return read_flag("SecureBoot");
+}
+
+int is_efi_secure_boot_setup_mode(void) {
+        return read_flag("SetupMode");
+}
+
+int efi_get_variable(
+                sd_id128_t vendor,
+                const char *name,
+                uint32_t *attribute,
+                void **value,
+                size_t *size) {
+
         _cleanup_close_ int fd = -1;
         _cleanup_free_ char *p = NULL;
         uint32_t a;
@@ -62,7 +97,7 @@ int efi_get_variable(sd_id128_t vendor, const char *name, uint32_t *attribute, v
 
         n = read(fd, &a, sizeof(a));
         if (n < 0)
-                return (int) n;
+                return -errno;
         if (n != sizeof(a))
                 return -EIO;
 
@@ -73,7 +108,7 @@ int efi_get_variable(sd_id128_t vendor, const char *name, uint32_t *attribute, v
         n = read(fd, r, (size_t) st.st_size - 4);
         if (n < 0) {
                 free(r);
-                return (int) -n;
+                return -errno;
         }
         if (n != (ssize_t) st.st_size - 4) {
                 free(r);
@@ -85,7 +120,7 @@ int efi_get_variable(sd_id128_t vendor, const char *name, uint32_t *attribute, v
         ((char*) r)[st.st_size - 4 + 1] = 0;
 
         *value = r;
-        *size = (size_t) st.st_size;
+        *size = (size_t) st.st_size - 4;
 
         if (attribute)
                 *attribute = a;
@@ -93,98 +128,300 @@ int efi_get_variable(sd_id128_t vendor, const char *name, uint32_t *attribute, v
         return 0;
 }
 
-static int read_bogomips(unsigned long *u) {
-        _cleanup_fclose_ FILE *f = NULL;
+int efi_get_variable_string(sd_id128_t vendor, const char *name, char **p) {
+        _cleanup_free_ void *s = NULL;
+        size_t ss;
+        int r;
+        char *x;
 
-        f = fopen("/proc/cpuinfo", "re");
-        if (!f)
-                return -errno;
+        r = efi_get_variable(vendor, name, NULL, &s, &ss);
+        if (r < 0)
+                return r;
 
-        while (!feof(f)) {
-                char line[LINE_MAX];
-                char *x;
-                unsigned long a, b;
+        x = utf16_to_utf8(s, ss);
+        if (!x)
+                return -ENOMEM;
 
-                if (!fgets(line, sizeof(line), f))
-                        return -EIO;
+        *p = x;
+        return 0;
+}
+
+static size_t utf16_size(const uint16_t *s) {
+        size_t l = 0;
+
+        while (s[l] > 0)
+                l++;
+
+        return (l+1) * sizeof(uint16_t);
+}
+
+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;
+
+        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;
+        memcpy(&id128->bytes[8], uuid->u4, sizeof(uuid->u4));
+}
+
+int efi_get_boot_option(
+                uint16_t id,
+                char **title,
+                sd_id128_t *part_uuid,
+                char **path) {
+
+        struct boot_option {
+                uint32_t attr;
+                uint16_t path_len;
+                uint16_t title[];
+        } _packed_;
+
+        struct drive_path {
+                uint32_t part_nr;
+                uint64_t part_start;
+                uint64_t part_size;
+                char signature[16];
+                uint8_t mbr_type;
+                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_;
+
+        char boot_id[9];
+        _cleanup_free_ uint8_t *buf = NULL;
+        size_t l;
+        struct boot_option *header;
+        size_t title_size;
+        char *s = NULL;
+        char *p = NULL;
+        sd_id128_t p_uuid = SD_ID128_NULL;
+        int err;
+
+        snprintf(boot_id, sizeof(boot_id), "Boot%04X", id);
+        err = efi_get_variable(EFI_VENDOR_GLOBAL, boot_id, NULL, (void **)&buf, &l);
+        if (err < 0)
+                return err;
+        if (l < sizeof(struct boot_option))
+                return -ENOENT;
+
+        header = (struct boot_option *)buf;
+        title_size = utf16_size(header->title);
+        if (title_size > l - offsetof(struct boot_option, title))
+                return -EINVAL;
+
+        if (title) {
+                s = utf16_to_utf8(header->title, title_size);
+                if (!s) {
+                        err = -ENOMEM;
+                        goto err;
+                }
+        }
+
+        if (header->path_len > 0) {
+                uint8_t *dbuf;
+                size_t dnext;
+
+                dbuf = buf + offsetof(struct boot_option, title) + title_size;
+                dnext = 0;
+                while (dnext < header->path_len) {
+                        struct device_path *dpath;
+
+                        dpath = (struct device_path *)(dbuf + dnext);
+                        if (dpath->length < 4)
+                                break;
+
+                        /* Type 0x7F – End of Hardware Device Path, Sub-Type 0xFF – End Entire Device Path */
+                        if (dpath->type == 0x7f && dpath->sub_type == 0xff)
+                                break;
+
+                        dnext += dpath->length;
+
+                        /* Type 0x04 – Media Device Path */
+                        if (dpath->type != 0x04)
+                                continue;
+
+                        /* Sub-Type 1 – Hard Drive */
+                        if (dpath->sub_type == 0x01) {
+                                /* 0x02 – GUID Partition Table */
+                                if (dpath->drive.mbr_type != 0x02)
+                                        continue;
+
+                                /* 0x02 – GUID signature */
+                                if (dpath->drive.signature_type != 0x02)
+                                        continue;
+
+                                if (part_uuid)
+                                        efi_guid_to_id128(dpath->drive.signature, &p_uuid);
+                                continue;
+                        }
+
+                        /* Sub-Type 4 – File Path */
+                        if (dpath->sub_type == 0x04 && !p && path) {
+                                p = utf16_to_utf8(dpath->path, dpath->length-4);
+                                continue;
+                        }
+                }
+        }
+
+        if (title)
+                *title = s;
+        if (part_uuid)
+                *part_uuid = p_uuid;
+        if (path)
+                *path = p;
+
+        return 0;
+err:
+        free(s);
+        free(p);
+        return err;
+}
 
-                char_array_0(line);
-                truncate_nl(line);
+int efi_get_boot_order(uint16_t **order) {
+        void *buf;
+        size_t l;
+        int r;
 
-                if (!startswith(line, "bogomips"))
+        r = efi_get_variable(EFI_VENDOR_GLOBAL, "BootOrder", NULL, &buf, &l);
+        if (r < 0)
+                return r;
+
+        if (l <= 0) {
+                free(buf);
+                return -ENOENT;
+        }
+
+        if ((l % sizeof(uint16_t) > 0) ||
+            (l / sizeof(uint16_t) > INT_MAX)) {
+                free(buf);
+                return -EINVAL;
+        }
+
+        *order = buf;
+        return (int) (l / sizeof(uint16_t));
+}
+
+static int boot_id_hex(const char s[4]) {
+        int i;
+        int id = 0;
+
+        for (i = 0; i < 4; i++)
+                if (s[i] >= '0' && s[i] <= '9')
+                        id |= (s[i] - '0') << (3 - i) * 4;
+                else if (s[i] >= 'A' && s[i] <= 'F')
+                        id |= (s[i] - 'A' + 10) << (3 - i) * 4;
+                else
+                        return -1;
+
+        return id;
+}
+
+static int cmp_uint16(const void *_a, const void *_b) {
+        const uint16_t *a = _a, *b = _b;
+
+        return (int)*a - (int)*b;
+}
+
+int efi_get_boot_options(uint16_t **options) {
+        _cleanup_closedir_ DIR *dir = NULL;
+        struct dirent *de;
+        uint16_t *list = NULL;
+        int count = 0, r;
+
+        assert(options);
+
+        dir = opendir("/sys/firmware/efi/efivars/");
+        if (!dir)
+                return -errno;
+
+        FOREACH_DIRENT(de, dir, r = -errno; goto fail) {
+                int id;
+                uint16_t *t;
+
+                if (strncmp(de->d_name, "Boot", 4) != 0)
                         continue;
 
-                x = line + 8;
-                x += strspn(x, WHITESPACE);
-                if (*x != ':')
+                if (strlen(de->d_name) != 45)
                         continue;
-                x++;
-                x += strspn(x, WHITESPACE);
 
-                if (sscanf(x, "%lu.%lu", &a, &b) != 2)
+                if (strcmp(de->d_name + 8, "-8be4df61-93ca-11d2-aa0d-00e098032b8c") != 0)
                         continue;
 
-                *u = a * 1000000L + b * 10000L;
-                return 0;
+                id = boot_id_hex(de->d_name + 4);
+                if (id < 0)
+                        continue;
+
+                t = realloc(list, (count + 1) * sizeof(uint16_t));
+                if (!t) {
+                        r = -ENOMEM;
+                        goto fail;
+                }
+
+                list = t;
+                list[count ++] = id;
         }
 
-        return -EIO;
+        qsort_safe(list, count, sizeof(uint16_t), cmp_uint16);
+
+        *options = list;
+        return count;
+
+fail:
+        free(list);
+        return r;
 }
 
-static int read_ticks(sd_id128_t vendor, const char *name, unsigned long speed, usec_t *u) {
-        _cleanup_free_ void *i = NULL;
+static int read_usec(sd_id128_t vendor, const char *name, usec_t *u) {
         _cleanup_free_ char *j = NULL;
-        size_t is;
         int r;
         uint64_t x;
 
         assert(name);
         assert(u);
 
-        r = efi_get_variable(EFI_VENDOR_LOADER, name, NULL, &i, &is);
+        r = efi_get_variable_string(EFI_VENDOR_LOADER, name, &j);
         if (r < 0)
                 return r;
 
-        j = utf16_to_utf8(i, is);
-        if (!j)
-                return -ENOMEM;
-
         r = safe_atou64(j, &x);
         if (r < 0)
                 return r;
 
-        *u = USEC_PER_SEC * x / speed;
+        *u = x;
         return 0;
 }
 
-static int get_boot_usec(usec_t *firmware, usec_t *loader) {
+int efi_loader_get_boot_usec(usec_t *firmware, usec_t *loader) {
         uint64_t x, y;
         int r;
-        unsigned long bogomips;
 
         assert(firmware);
         assert(loader);
 
-        /* Returns the usec after the CPU was turned on. The two
-         * timestamps are: the firmware finished, and the boot loader
-         * finished. */
-
-        /* We assume that the kernel's bogomips value is calibrated to
-         * twice the CPU frequency, and use this to convert the TSC
-         * ticks into usec. Of course, bogomips are only vaguely
-         * defined. If this breaks one day we can come up with
-         * something better. However, for now this saves us from doing
-         * a local calibration loop. */
-
-        r = read_bogomips(&bogomips);
+        r = read_usec(EFI_VENDOR_LOADER, "LoaderTimeInitUSec", &x);
         if (r < 0)
                 return r;
 
-        r = read_ticks(EFI_VENDOR_LOADER, "LoaderTicksInit", bogomips / 2, &x);
-        if (r < 0)
-                return r;
-
-        r = read_ticks(EFI_VENDOR_LOADER, "LoaderTicksExec", bogomips / 2, &y);
+        r = read_usec(EFI_VENDOR_LOADER, "LoaderTimeExecUSec", &y);
         if (r < 0)
                 return r;
 
@@ -200,38 +437,28 @@ static int get_boot_usec(usec_t *firmware, usec_t *loader) {
         return 0;
 }
 
-int efi_get_boot_timestamps(const dual_timestamp *n, dual_timestamp *firmware, dual_timestamp *loader) {
-        usec_t x, y, a;
-        int r;
-        dual_timestamp _n;
-
-        assert(firmware);
-        assert(loader);
+int efi_loader_get_device_part_uuid(sd_id128_t *u) {
+        _cleanup_free_ char *p = NULL;
+        int r, parsed[16];
+        unsigned i;
 
-        if (!n) {
-                dual_timestamp_get(&_n);
-                n = &_n;
-        }
+        assert(u);
 
-        r = get_boot_usec(&x, &y);
+        r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderDevicePartUUID", &p);
         if (r < 0)
                 return r;
 
-        /* Let's convert this to timestamps where the firmware
-         * began/loader began working. To make this more confusing:
-         * since usec_t is unsigned and the kernel's monotonic clock
-         * begins at kernel initialization we'll actually initialize
-         * the monotonic timestamps here as negative of the actual
-         * value. */
-
-        firmware->monotonic = y;
-        loader->monotonic = y - x;
-
-        a = n->monotonic + firmware->monotonic;
-        firmware->realtime = n->realtime > a ? n->realtime - a : 0;
+        if (sscanf(p, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
+                   &parsed[0], &parsed[1], &parsed[2], &parsed[3],
+                   &parsed[4], &parsed[5], &parsed[6], &parsed[7],
+                   &parsed[8], &parsed[9], &parsed[10], &parsed[11],
+                   &parsed[12], &parsed[13], &parsed[14], &parsed[15]) != 16)
+                return -EIO;
 
-        a = n->monotonic + loader->monotonic;
-        loader->realtime = n->realtime > a ? n->realtime - a : 0;
+        for (i = 0; i < ELEMENTSOF(parsed); i++)
+                u->bytes[i] = parsed[i];
 
         return 0;
 }
+
+#endif