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Print a warning if system encryption is used and device is a partition.

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System encryption hav metadata in space located ouside of
partition itself.

Ideally the check should be automatic but for virtualized systems
(where a partition could be "whole device" for another sustem this
can be dangerous.
This commit is contained in:
Milan Broz
2013-06-23 15:26:45 +02:00
parent a36de633d5
commit 42b0ab437a
3 changed files with 33 additions and 6 deletions
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27
lib/utils_devpath.c
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@@ -170,13 +170,13 @@ char *crypt_lookup_dev(const char *dev_id)
return devpath;
}
int crypt_sysfs_get_rotational(int major, int minor, int *rotational)
static int _sysfs_get_int(int major, int minor, int *value, const char *attr)
{
char path[PATH_MAX], tmp[64] = {0};
int fd, r;
if (snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/queue/rotational",
major, minor) < 0)
if (snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/%s",
major, minor, attr) < 0)
return 0;
if ((fd = open(path, O_RDONLY)) < 0)
@@ -187,8 +187,27 @@ int crypt_sysfs_get_rotational(int major, int minor, int *rotational)
if (r <= 0)
return 0;
if (sscanf(tmp, "%d", rotational) != 1)
if (sscanf(tmp, "%d", value) != 1)
return 0;
return 1;
}
int crypt_sysfs_get_rotational(int major, int minor, int *rotational)
{
return _sysfs_get_int(major, minor, rotational, "queue/rotational");
}
int crypt_sysfs_get_partition(const char *dev_path, int *partition)
{
struct stat st;
if (stat(dev_path, &st) < 0)
return 0;
if (!S_ISBLK(st.st_mode))
return 0;
return _sysfs_get_int(major(st.st_rdev), minor(st.st_rdev),
partition, "partition");
}