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| author | Alexey Dobriyan <adobriyan@sw.ru> | 2007-09-18 22:46:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-09-19 11:24:17 -0700 |
| commit | efc63c4fb0f95865907472d1c6bc0cfea9ee156b (patch) | |
| tree | 197650d8698f62c4886305e859cfbbf16aada5fc | |
| parent | 019ad4a0a60b09022945273848b5a686e39a78aa (diff) | |
| download | linux-efc63c4fb0f95865907472d1c6bc0cfea9ee156b.tar.gz linux-efc63c4fb0f95865907472d1c6bc0cfea9ee156b.tar.bz2 linux-efc63c4fb0f95865907472d1c6bc0cfea9ee156b.zip | |
Fix UTS corruption during clone(CLONE_NEWUTS)
struct utsname is copied from master one without any exclusion.
Here is sample output from one proggie doing
sethostname("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
sethostname("bbbbbbbbbbbbbbbbbbbbbbbbbbbbbb");
and another
clone(,, CLONE_NEWUTS, ...)
uname()
hostname = 'aaaaaaaaaaaaaaaaaaaaaaaaabbbbb'
hostname = 'bbbaaaaaaaaaaaaaaaaaaaaaaaaaaa'
hostname = 'aaaaaaaabbbbbbbbbbbbbbbbbbbbbb'
hostname = 'aaaaaaaaaaaaaaaaaaaaaaaaaabbbb'
hostname = 'aaaaaaaaaaaaaaaaaaaaaaaaaaaabb'
hostname = 'aaabbbbbbbbbbbbbbbbbbbbbbbbbbb'
hostname = 'bbbbbbbbbbbbbbbbaaaaaaaaaaaaaa'
Hostname is sometimes corrupted.
Yes, even _the_ simplest namespace activity had bug in it. :-(
Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | kernel/utsname.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/utsname.c b/kernel/utsname.c index 9d8180a0f0d8..816d7b24fa03 100644 --- a/kernel/utsname.c +++ b/kernel/utsname.c @@ -28,7 +28,9 @@ static struct uts_namespace *clone_uts_ns(struct uts_namespace *old_ns) if (!ns) return ERR_PTR(-ENOMEM); + down_read(&uts_sem); memcpy(&ns->name, &old_ns->name, sizeof(ns->name)); + up_read(&uts_sem); kref_init(&ns->kref); return ns; } |