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Revert "apparmor: add base infastructure for socket mediation"

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This reverts commit 651e28c553.

This caused a regression:
 "The specific problem is that dnsmasq refuses to start on openSUSE Leap
  42.2.  The specific cause is that and attempt to open a PF_LOCAL socket
  gets EACCES.  This means that networking doesn't function on a system
  with a 4.14-rc2 system."

Sadly, the developers involved seemed to be in denial for several weeks
about this, delaying the revert.  This has not been a good release for
the security subsystem, and this area needs to change development
practices.

Reported-and-bisected-by: James Bottomley <James.Bottomley@hansenpartnership.com>
Tracked-by: Thorsten Leemhuis <regressions@leemhuis.info>
Cc: John Johansen <john.johansen@canonical.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Seth Arnold <seth.arnold@canonical.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds
2017-10-26 19:35:35 +02:00
parent 5678255027
commit 80c094a47d
12 changed files with 16 additions and 840 deletions
Download Patch File Download Diff File Expand all files Collapse all files

47
security/apparmor/policy_unpack.c
View File

@@ -275,19 +275,6 @@ fail:
return 0;
}
static bool unpack_u16(struct aa_ext *e, u16 *data, const char *name)
{
if (unpack_nameX(e, AA_U16, name)) {
if (!inbounds(e, sizeof(u16)))
return 0;
if (data)
*data = le16_to_cpu(get_unaligned((__le16 *) e->pos));
e->pos += sizeof(u16);
return 1;
}
return 0;
}
static bool unpack_u32(struct aa_ext *e, u32 *data, const char *name)
{
if (unpack_nameX(e, AA_U32, name)) {
@@ -597,7 +584,7 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
struct aa_profile *profile = NULL;
const char *tmpname, *tmpns = NULL, *name = NULL;
const char *info = "failed to unpack profile";
size_t size = 0, ns_len;
size_t ns_len;
struct rhashtable_params params = { 0 };
char *key = NULL;
struct aa_data *data;
@@ -730,38 +717,6 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
goto fail;
}
size = unpack_array(e, "net_allowed_af");
if (size) {
for (i = 0; i < size; i++) {
/* discard extraneous rules that this kernel will
* never request
*/
if (i >= AF_MAX) {
u16 tmp;
if (!unpack_u16(e, &tmp, NULL) ||
!unpack_u16(e, &tmp, NULL) ||
!unpack_u16(e, &tmp, NULL))
goto fail;
continue;
}
if (!unpack_u16(e, &profile->net.allow[i], NULL))
goto fail;
if (!unpack_u16(e, &profile->net.audit[i], NULL))
goto fail;
if (!unpack_u16(e, &profile->net.quiet[i], NULL))
goto fail;
}
if (!unpack_nameX(e, AA_ARRAYEND, NULL))
goto fail;
}
if (VERSION_LT(e->version, v7)) {
/* pre v7 policy always allowed these */
profile->net.allow[AF_UNIX] = 0xffff;
profile->net.allow[AF_NETLINK] = 0xffff;
}
if (unpack_nameX(e, AA_STRUCT, "policydb")) {
/* generic policy dfa - optional and may be NULL */
info = "failed to unpack policydb";