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| author | Neil Brown <neilb@suse.de> | 2005-06-07 23:03:48 +0000 |
|---|---|---|
| committer | Neil Brown <neilb@suse.de> | 2005-06-07 23:03:48 +0000 |
| commit | dfe47e008e10d5640c6b3d0ae6de7ef6cefcb7b2 (patch) | |
| tree | 0fd6aa40bd1559c813eab17392936bdaf2514a1f /super1.c | |
| parent | 892debc8200517e8b00750367acd890199f9f4de (diff) | |
| download | mdadm-dfe47e008e10d5640c6b3d0ae6de7ef6cefcb7b2.tar.gz mdadm-dfe47e008e10d5640c6b3d0ae6de7ef6cefcb7b2.tar.xz mdadm-dfe47e008e10d5640c6b3d0ae6de7ef6cefcb7b2.zip | |
Make sure to seed the random number generator for uuids
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Diffstat (limited to 'super1.c')
| -rw-r--r-- | super1.c | 13 |
1 files changed, 9 insertions, 4 deletions
@@ -466,6 +466,7 @@ static int write_init_super1(struct supertype *st, void *sbv, mdu_disk_info_t *d struct mdp_superblock_1 *sb = sbv; struct mdp_superblock_1 *refsb = NULL; int fd = open(devname, O_RDWR | O_EXCL); + int rfd; int rv; long size; @@ -480,10 +481,14 @@ static int write_init_super1(struct supertype *st, void *sbv, mdu_disk_info_t *d sb->dev_number = __cpu_to_le32(dinfo->number); - *(__u32*)(sb->device_uuid) = random(); - *(__u32*)(sb->device_uuid+4) = random(); - *(__u32*)(sb->device_uuid+8) = random(); - *(__u32*)(sb->device_uuid+12) = random(); + if ((rfd = open("/dev/urandom", O_RDONLY)) < 0 || + read(rfd, sb->device_uuid, 16) != 16) { + *(__u32*)(sb->device_uuid) = random(); + *(__u32*)(sb->device_uuid+4) = random(); + *(__u32*)(sb->device_uuid+8) = random(); + *(__u32*)(sb->device_uuid+12) = random(); + } + if (rfd >= 0) close(rfd); sb->events = 0; if (load_super1(st, fd, (void**)&refsb, NULL)==0) { |