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2019-05-25apparmorfs: fix use-after-free on symlink traversalAl Viro
[ Upstream commit f51dcd0f621caac5380ce90fbbeafc32ce4517ae ] symlink body shouldn't be freed without an RCU delay. Switch apparmorfs to ->destroy_inode() and use of call_rcu(); free both the inode and symlink body in the callback. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-03-13apparmor: Fix aa_label_build() error handling for failed mergesJohn Johansen
[ Upstream commit d6d478aee003e19ef90321176552a8ad2929a47f ] aa_label_merge() can return NULL for memory allocations failures make sure to handle and set the correct error in this case. Reported-by: Peng Hao <peng.hao2@zte.com.cn> Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2018-11-27apparmor: Fix uninitialized value in aa_split_fqnameZubin Mithra
[ Upstream commit 250f2da49cb8e582215a65c03f50e8ddf5cd119c ] Syzkaller reported a OOB-read with the stacktrace below. This occurs inside __aa_lookupn_ns as `n` is not initialized. `n` is obtained from aa_splitn_fqname. In cases where `name` is invalid, aa_splitn_fqname returns without initializing `ns_name` and `ns_len`. Fix this by always initializing `ns_name` and `ns_len`. __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430 memcmp+0xe3/0x160 lib/string.c:861 strnstr+0x4b/0x70 lib/string.c:934 __aa_lookupn_ns+0xc1/0x570 security/apparmor/policy_ns.c:209 aa_lookupn_ns+0x88/0x1e0 security/apparmor/policy_ns.c:240 aa_fqlookupn_profile+0x1b9/0x1010 security/apparmor/policy.c:468 fqlookupn_profile+0x80/0xc0 security/apparmor/label.c:1844 aa_label_strn_parse+0xa3a/0x1230 security/apparmor/label.c:1908 aa_label_parse+0x42/0x50 security/apparmor/label.c:1943 aa_change_profile+0x513/0x3510 security/apparmor/domain.c:1362 apparmor_setprocattr+0xaa4/0x1150 security/apparmor/lsm.c:658 security_setprocattr+0x66/0xc0 security/security.c:1298 proc_pid_attr_write+0x301/0x540 fs/proc/base.c:2555 __vfs_write+0x119/0x9f0 fs/read_write.c:485 vfs_write+0x1fc/0x560 fs/read_write.c:549 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Fixes: 3b0aaf5866bf ("apparmor: add lib fn to find the "split" for fqnames") Reported-by: syzbot+61e4b490d9d2da591b50@syzkaller.appspotmail.com Signed-off-by: Zubin Mithra <zsm@chromium.org> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2018-09-03apparmor: fix bad debug check in apparmor_secid_to_secctx()John Johansen
apparmor_secid_to_secctx() has a bad debug statement tripping on a condition handle by the code. When kconfig SECURITY_APPARMOR_DEBUG is enabled the debug WARN_ON will trip when **secdata is NULL resulting in the following trace. ------------[ cut here ]------------ AppArmor WARN apparmor_secid_to_secctx: ((!secdata)): WARNING: CPU: 0 PID: 14826 at security/apparmor/secid.c:82 apparmor_secid_to_secctx+0x2b5/0x2f0 security/apparmor/secid.c:82 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 14826 Comm: syz-executor1 Not tainted 4.19.0-rc1+ #193 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 panic+0x238/0x4e7 kernel/panic.c:184 __warn.cold.8+0x163/0x1ba kernel/panic.c:536 report_bug+0x252/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:993 RIP: 0010:apparmor_secid_to_secctx+0x2b5/0x2f0 security/apparmor/secid.c:82 Code: c7 c7 40 66 58 87 e8 6a 6d 0f fe 0f 0b e9 6c fe ff ff e8 3e aa 44 fe 48 c7 c6 80 67 58 87 48 c7 c7 a0 65 58 87 e8 4b 6d 0f fe <0f> 0b e9 3f fe ff ff 48 89 df e8 fc a7 83 fe e9 ed fe ff ff bb f4 RSP: 0018:ffff8801ba1bed10 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff8801ba1beed0 RCX: ffffc9000227e000 RDX: 0000000000018482 RSI: ffffffff8163ac01 RDI: 0000000000000001 RBP: ffff8801ba1bed30 R08: ffff8801b80ec080 R09: ffffed003b603eca R10: ffffed003b603eca R11: ffff8801db01f657 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801ba1beed0 security_secid_to_secctx+0x63/0xc0 security/security.c:1314 ctnetlink_secctx_size net/netfilter/nf_conntrack_netlink.c:621 [inline] ctnetlink_nlmsg_size net/netfilter/nf_conntrack_netlink.c:659 [inline] ctnetlink_conntrack_event+0x303/0x1470 net/netfilter/nf_conntrack_netlink.c:706 nf_conntrack_eventmask_report+0x55f/0x930 net/netfilter/nf_conntrack_ecache.c:151 nf_conntrack_event_report include/net/netfilter/nf_conntrack_ecache.h:112 [inline] nf_ct_delete+0x33c/0x5d0 net/netfilter/nf_conntrack_core.c:601 nf_ct_iterate_cleanup+0x48c/0x5e0 net/netfilter/nf_conntrack_core.c:1892 nf_ct_iterate_cleanup_net+0x23c/0x2d0 net/netfilter/nf_conntrack_core.c:1974 ctnetlink_flush_conntrack net/netfilter/nf_conntrack_netlink.c:1226 [inline] ctnetlink_del_conntrack+0x66c/0x850 net/netfilter/nf_conntrack_netlink.c:1258 nfnetlink_rcv_msg+0xd88/0x1070 net/netfilter/nfnetlink.c:228 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2454 nfnetlink_rcv+0x1c0/0x4d0 net/netfilter/nfnetlink.c:560 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x5a0/0x760 net/netlink/af_netlink.c:1343 netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2114 __sys_sendmsg+0x11d/0x290 net/socket.c:2152 __do_sys_sendmsg net/socket.c:2161 [inline] __se_sys_sendmsg net/socket.c:2159 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2159 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f7bc6e03c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f7bc6e046d4 RCX: 0000000000457089 RDX: 0000000000000000 RSI: 0000000020d65000 RDI: 0000000000000003 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d4588 R14: 00000000004c8d5c R15: 0000000000000000 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds.. CC: <stable@vger.kernel.org> #4.18 Fixes: c092921219d2 ("apparmor: add support for mapping secids and using secctxes") Reported-by: syzbot+21016130b0580a9de3b5@syzkaller.appspotmail.com Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-08-24Merge tag 'apparmor-pr-2018-08-23' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor Pull apparmor updates from John Johansen: "There is nothing major this time just four bug fixes and a patch to remove some dead code: Cleanups: - remove no-op permission check in policy_unpack Bug fixes: - fix an error code in __aa_create_ns() - fix failure to audit context info in build_change_hat - check buffer bounds when mapping permissions mask - fully initialize aa_perms struct when answering userspace query" * tag 'apparmor-pr-2018-08-23' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor: apparmor: remove no-op permission check in policy_unpack apparmor: fix an error code in __aa_create_ns() apparmor: Fix failure to audit context info in build_change_hat apparmor: Fully initialize aa_perms struct when answering userspace query apparmor: Check buffer bounds when mapping permissions mask
2018-08-22apparmor: remove no-op permission check in policy_unpackJohn Johansen
The patch 736ec752d95e: "AppArmor: policy routines for loading and unpacking policy" from Jul 29, 2010, leads to the following static checker warning: security/apparmor/policy_unpack.c:410 verify_accept() warn: bitwise AND condition is false here security/apparmor/policy_unpack.c:413 verify_accept() warn: bitwise AND condition is false here security/apparmor/policy_unpack.c 392 #define DFA_VALID_PERM_MASK 0xffffffff 393 #define DFA_VALID_PERM2_MASK 0xffffffff 394 395 /** 396 * verify_accept - verify the accept tables of a dfa 397 * @dfa: dfa to verify accept tables of (NOT NULL) 398 * @flags: flags governing dfa 399 * 400 * Returns: 1 if valid accept tables else 0 if error 401 */ 402 static bool verify_accept(struct aa_dfa *dfa, int flags) 403 { 404 int i; 405 406 /* verify accept permissions */ 407 for (i = 0; i < dfa->tables[YYTD_ID_ACCEPT]->td_lolen; i++) { 408 int mode = ACCEPT_TABLE(dfa)[i]; 409 410 if (mode & ~DFA_VALID_PERM_MASK) 411 return 0; 412 413 if (ACCEPT_TABLE2(dfa)[i] & ~DFA_VALID_PERM2_MASK) 414 return 0; fixes: 736ec752d95e ("AppArmor: policy routines for loading and unpacking policy") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-08-21apparmor: fix an error code in __aa_create_ns()Dan Carpenter
We should return error pointers in this function. Returning NULL results in a NULL dereference in the caller. Fixes: 73688d1ed0b8 ("apparmor: refactor prepare_ns() and make usable from different views") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-07-20apparmor: Fix failure to audit context info in build_change_hatJohn Johansen
Cleans up clang warning: warning: variable 'info' set but not used [-Wunused-but-set-variable] Fixes: 89dbf1962aa63 ("apparmor: move change_hat mediation to using labels") Reported-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-07-19apparmor: Fully initialize aa_perms struct when answering userspace queryTyler Hicks
Fully initialize the aa_perms struct in profile_query_cb() to avoid the potential of using an uninitialized struct member's value in a response to a query from userspace. Detected by CoverityScan CID#1415126 ("Uninitialized scalar variable") Fixes: 4f3b3f2d79a4 ("apparmor: add profile permission query ability") Signed-off-by: Tyler Hicks <tyhicks@canonical.com> Acked-by: Serge Hallyn <serge@hallyn.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-07-19apparmor: Check buffer bounds when mapping permissions maskTyler Hicks
Don't read past the end of the buffer containing permissions characters or write past the end of the destination string. Detected by CoverityScan CID#1415361, 1415376 ("Out-of-bounds access") Fixes: e53cfe6c7caa ("apparmor: rework perm mapping to a slightly broader set") Signed-off-by: Tyler Hicks <tyhicks@canonical.com> Acked-by: Serge Hallyn <serge@hallyn.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-07-12->file_open(): lose cred argumentAl Viro
Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2018-06-14Merge tag 'apparmor-pr-2018-06-13' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor Pull AppArmor updates from John Johansen: "Features - add support for mapping secids and using secctxes - add the ability to get a task's secid - add support for audit rule filtering Cleanups: - multiple typo fixes - Convert to use match_string() helper - update git and wiki locations in AppArmor docs - improve get_buffers macro by using get_cpu_ptr - Use an IDR to allocate apparmor secids Bug fixes: - fix '*seclen' is never less than zero - fix mediation of prlimit - fix memory leak when deduping profile load - fix ptrace read check - fix memory leak of rule on error exit path" * tag 'apparmor-pr-2018-06-13' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor: (21 commits) apparmor: fix ptrace read check apparmor: fix memory leak when deduping profile load apparmor: fix mediation of prlimit apparmor: fixup secid map conversion to using IDR apparmor: Use an IDR to allocate apparmor secids apparmor: Fix memory leak of rule on error exit path apparmor: modify audit rule support to support profile stacks apparmor: Add support for audit rule filtering apparmor: update git and wiki locations in AppArmor docs apparmor: Convert to use match_string() helper apparmor: improve get_buffers macro by using get_cpu_ptr apparmor: fix '*seclen' is never less than zero apparmor: fix typo "preconfinement" apparmor: fix typo "independent" apparmor: fix typo "traverse" apparmor: fix typo "type" apparmor: fix typo "replace" apparmor: fix typo "comparison" apparmor: fix typo "loosen" apparmor: add the ability to get a task's secid ...
2018-06-12treewide: kzalloc() -> kcalloc()Kees Cook
The kzalloc() function has a 2-factor argument form, kcalloc(). This patch replaces cases of: kzalloc(a * b, gfp) with: kcalloc(a * b, gfp) as well as handling cases of: kzalloc(a * b * c, gfp) with: kzalloc(array3_size(a, b, c), gfp) as it's slightly less ugly than: kzalloc_array(array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: kzalloc(4 * 1024, gfp) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ type TYPE; expression THING, E; @@ ( kzalloc( - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | kzalloc( - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression COUNT; typedef u8; typedef __u8; @@ ( kzalloc( - sizeof(u8) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(__u8) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(char) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(unsigned char) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(u8) * COUNT + COUNT , ...) | kzalloc( - sizeof(__u8) * COUNT + COUNT , ...) | kzalloc( - sizeof(char) * COUNT + COUNT , ...) | kzalloc( - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - kzalloc + kcalloc ( - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ identifier SIZE, COUNT; @@ - kzalloc + kcalloc ( - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( kzalloc( - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( kzalloc( - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kzalloc( - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kzalloc( - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ identifier STRIDE, SIZE, COUNT; @@ ( kzalloc( - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products, // when they're not all constants... @@ expression E1, E2, E3; constant C1, C2, C3; @@ ( kzalloc(C1 * C2 * C3, ...) | kzalloc( - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | kzalloc( - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | kzalloc( - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | kzalloc( - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants, // keeping sizeof() as the second factor argument. @@ expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( kzalloc(sizeof(THING) * C2, ...) | kzalloc(sizeof(TYPE) * C2, ...) | kzalloc(C1 * C2 * C3, ...) | kzalloc(C1 * C2, ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - kzalloc + kcalloc ( - (E1) * E2 + E1, E2 , ...) | - kzalloc + kcalloc ( - (E1) * (E2) + E1, E2 , ...) | - kzalloc + kcalloc ( - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-07apparmor: fix ptrace read checkJohn Johansen
The ptrace read check is incorrect resulting in policy that is broader than it needs to be. Fix the check so that read access permission can be properly detected when other ptrace flags are set. Fixes: b2d09ae449ce ("apparmor: move ptrace checks to using labels") Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-06-07apparmor: fix memory leak when deduping profile loadJohn Johansen
AppArmor is leaking the newly loaded profile and its proxy when the profile is an exact match to the currently loaded version. In this case the dedup check results in the profile being skipped and put without dealing with the proxy ref thus not breaking a circular refcount and causing a leak. BugLink: http://bugs.launchpad.net/bugs/1750594 Fixes: 5d5182cae401 ("apparmor: move to per loaddata files, instead of replicating in profiles") Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-06-07apparmor: fix mediation of prlimitJohn Johansen
For primit apparmor requires that if target confinement does not match the setting task's confinement, the setting task requires CAP_SYS_RESOURCE. Unfortunately this was broken when rlimit enforcement was reworked to support labels. Fixes: 86b92cb782b3 ("apparmor: move resource checks to using labels") Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-06-07apparmor: fixup secid map conversion to using IDRJohn Johansen
The IDR conversion did not handle an error case for when allocating a mapping fails, and it did not ensure that mappings did not allocate or use a 0 value, which is used as an invalid secid. Which is used when a mapping fails. Fixes: 3ae7eb49a2be ("apparmor: Use an IDR to allocate apparmor secids") Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-06-07apparmor: Use an IDR to allocate apparmor secidsMatthew Wilcox
Replace the custom usage of the radix tree to store a list of free IDs with the IDR. Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-06-07apparmor: Fix memory leak of rule on error exit pathTyler Hicks
Currently on the error exit path the allocated rule is not free'd causing a memory leak. Fix this by calling aa_audit_rule_free(). Detected by CoverityScan, CID#1468966 ("Resource leaks") Fixes: cb740f574c7b ("apparmor: modify audit rule support to support profile stacks") Signed-off-by: Tyler Hicks <tyhicks@canonical.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-06-07apparmor: modify audit rule support to support profile stacksJohn Johansen
Allows for audit rules, where a rule could specify a profile stack A//&B, while extending the current semantic so if the label specified in the audit rule is a subset of the secid it is considered a match. Eg. if the secid resolves to the label stack A//&B//&C Then an audit rule specifying a label of A - would match B - would match C - would match D - would not A//&B - would match as a subset A//&C - would match as a subset B//&C - would match as a subset A//&B//&C - would match A//&D - would not match, because while A does match, D is also specified and does not Note: audit rules are currently assumed to be coming from the root namespace. Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-06-07apparmor: Add support for audit rule filteringMatthew Garrett
This patch adds support to Apparmor for integrating with audit rule filtering. Right now it only handles SUBJ_ROLE, interpreting it as a single component of a label. This is sufficient to get Apparmor working with IMA's appraisal rules without any modifications on the IMA side. Signed-off-by: Matthew Garrett <mjg59@google.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-06-07apparmor: Convert to use match_string() helperAndy Shevchenko
The new helper returns index of the matching string in an array. We are going to use it here. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Jay Freyensee <why2jjj.linux@gmail.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-06-07apparmor: improve get_buffers macro by using get_cpu_ptrJohn Johansen
Refactor get_buffers so the cpu_ptr can be obtained in the outer layer, instead of inside the macro. This also enables us to cleanup the code and use get_cpu_ptr, to handle the preempt_disable() Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Seth Arnold <seth.arnold@canonical.com>
2018-05-08apparmor: fix '*seclen' is never less than zeroJohn Johansen
smatch warnings: security/apparmor/secid.c:162 apparmor_secid_to_secctx() warn: unsigned '*seclen' is never less than zero. vim +162 security/apparmor/secid.c 140 141 int apparmor_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) 142 { 143 /* TODO: cache secctx and ref count so we don't have to recreate */ 144 struct aa_label *label = aa_secid_to_label(secid); 145 146 AA_BUG(!secdata); 147 AA_BUG(!seclen); 148 149 if (!label) 150 return -EINVAL; 151 152 if (secdata) 153 *seclen = aa_label_asxprint(secdata, root_ns, label, 154 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS | 155 FLAG_HIDDEN_UNCONFINED | 156 FLAG_ABS_ROOT, GFP_ATOMIC); 157 else 158 *seclen = aa_label_snxprint(NULL, 0, root_ns, label, 159 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS | 160 FLAG_HIDDEN_UNCONFINED | 161 FLAG_ABS_ROOT); > 162 if (*seclen < 0) 163 return -ENOMEM; 164 165 return 0; 166 } 167 Fixes: c092921219d2 ("apparmor: add support for mapping secids and using secctxes") Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-05-03apparmor: fix typo "preconfinement"Zygmunt Krynicki
Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com> Acked-by: Christian Boltz <apparmor@cboltz.de> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-05-03apparmor: fix typo "independent"Zygmunt Krynicki
Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com> Acked-by: Christian Boltz <apparmor@cboltz.de> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-05-03apparmor: fix typo "traverse"Zygmunt Krynicki
Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com> Acked-by: Christian Boltz <apparmor@cboltz.de> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-05-03apparmor: fix typo "type"Zygmunt Krynicki
Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com> Acked-by: Christian Boltz <apparmor@cboltz.de> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-05-03apparmor: fix typo "replace"Zygmunt Krynicki
Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com> Acked-by: Christian Boltz <apparmor@cboltz.de> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-05-03apparmor: fix typo "comparison"Zygmunt Krynicki
Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com> Acked-by: Christian Boltz <apparmor@cboltz.de> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-05-03apparmor: fix typo "loosen"Zygmunt Krynicki
Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com> Acked-by: Christian Boltz <apparmor@cboltz.de> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-05-02apparmor: add the ability to get a task's secidJohn Johansen
Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-05-02apparmor: add support for mapping secids and using secctxesJohn Johansen
Use a radix tree to provide a map between the secid and the label, and along with it a basic ability to provide secctx conversion. Shared/cached secctx will be added later. Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-04-13Merge tag 'apparmor-pr-2018-04-10' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor Pull apparmor updates from John Johansen: "Features: - add base infrastructure for socket mediation. ABI bump and additional checks to ensure only v8 compliant policy uses socket af mediation. - improve and cleanup dfa verification - improve profile attachment logic - improve overlapping expression handling - add the xattr matching to the attachment logic - improve signal mediation handling with stacked labels - improve handling of no_new_privs in a label stack Cleanups and changes: - use dfa to parse string split - bounded version of label_parse - proper line wrap nulldfa.in - split context out into task and cred naming to better match usage - simplify code in aafs Bug fixes: - fix display of .ns_name for containers - fix resource audit messages when auditing peer - fix logging of the existence test for signals - fix resource audit messages when auditing peer - fix display of .ns_name for containers - fix an error code in verify_table_headers() - fix memory leak on buffer on error exit path - fix error returns checks by making size a ssize_t" * tag 'apparmor-pr-2018-04-10' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor: (36 commits) apparmor: fix memory leak on buffer on error exit path apparmor: fix dangling symlinks to policy rawdata after replacement apparmor: Fix an error code in verify_table_headers() apparmor: fix error returns checks by making size a ssize_t apparmor: update MAINTAINERS file git and wiki locations apparmor: remove POLICY_MEDIATES_SAFE apparmor: add base infastructure for socket mediation apparmor: improve overlapping domain attachment resolution apparmor: convert attaching profiles via xattrs to use dfa matching apparmor: Add support for attaching profiles via xattr, presence and value apparmor: cleanup: simplify code to get ns symlink name apparmor: cleanup create_aafs() error path apparmor: dfa split verification of table headers apparmor: dfa add support for state differential encoding apparmor: dfa move character match into a macro apparmor: update domain transitions that are subsets of confinement at nnp apparmor: move context.h to cred.h apparmor: move task related defines and fns to task.X files apparmor: cleanup, drop unused fn __aa_task_is_confined() apparmor: cleanup fixup description of aa_replace_profiles ...
2018-04-07Merge branch 'next-general' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security Pull general security layer updates from James Morris: - Convert security hooks from list to hlist, a nice cleanup, saving about 50% of space, from Sargun Dhillon. - Only pass the cred, not the secid, to kill_pid_info_as_cred and security_task_kill (as the secid can be determined from the cred), from Stephen Smalley. - Close a potential race in kernel_read_file(), by making the file unwritable before calling the LSM check (vs after), from Kees Cook. * 'next-general' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: security: convert security hooks to use hlist exec: Set file unwritable before LSM check usb, signal, security: only pass the cred, not the secid, to kill_pid_info_as_cred and security_task_kill
2018-04-05headers: untangle kmemleak.h from mm.hRandy Dunlap
Currently <linux/slab.h> #includes <linux/kmemleak.h> for no obvious reason. It looks like it's only a convenience, so remove kmemleak.h from slab.h and add <linux/kmemleak.h> to any users of kmemleak_* that don't already #include it. Also remove <linux/kmemleak.h> from source files that do not use it. This is tested on i386 allmodconfig and x86_64 allmodconfig. It would be good to run it through the 0day bot for other $ARCHes. I have neither the horsepower nor the storage space for the other $ARCHes. Update: This patch has been extensively build-tested by both the 0day bot & kisskb/ozlabs build farms. Both of them reported 2 build failures for which patches are included here (in v2). [ slab.h is the second most used header file after module.h; kernel.h is right there with slab.h. There could be some minor error in the counting due to some #includes having comments after them and I didn't combine all of those. ] [akpm@linux-foundation.org: security/keys/big_key.c needs vmalloc.h, per sfr] Link: http://lkml.kernel.org/r/e4309f98-3749-93e1-4bb7-d9501a39d015@infradead.org Link: http://kisskb.ellerman.id.au/kisskb/head/13396/ Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Reviewed-by: Ingo Molnar <mingo@kernel.org> Reported-by: Michael Ellerman <mpe@ellerman.id.au> [2 build failures] Reported-by: Fengguang Wu <fengguang.wu@intel.com> [2 build failures] Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Wei Yongjun <weiyongjun1@huawei.com> Cc: Luis R. Rodriguez <mcgrof@kernel.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Mimi Zohar <zohar@linux.vnet.ibm.com> Cc: John Johansen <john.johansen@canonical.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-03-30apparmor: fix memory leak on buffer on error exit pathColin Ian King
Currently on the error exit path the allocated buffer is not free'd causing a memory leak. Fix this by kfree'ing it. Detected by CoverityScan, CID#1466876 ("Resource leaks") Fixes: 1180b4c757aa ("apparmor: fix dangling symlinks to policy rawdata after replacement") Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-03-28macro: introduce COUNT_ARGS() macroAlexei Starovoitov
move COUNT_ARGS() macro from apparmor to generic header and extend it to count till twelve. COUNT() was an alternative name for this logic, but it's used for different purpose in many other places. Similarly for CONCATENATE() macro. Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-03-23apparmor: fix dangling symlinks to policy rawdata after replacementJohn Johansen
When policy replacement occurs the symlinks in the profile directory need to be updated to point to the new rawdata, otherwise once the old rawdata is removed the symlink becomes broken. Fix this by dynamically generating the symlink everytime it is read. These links are used enough that their value needs to be cached and this way we can avoid needing locking to read and update the link value. Fixes: a481f4d917835 ("apparmor: add custom apparmorfs that will be used by policy namespace files") BugLink: http://bugs.launchpad.net/bugs/1755563 Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-03-23apparmor: Fix an error code in verify_table_headers()Dan Carpenter
We accidentally return a positive EPROTO instead of a negative -EPROTO. Since 71 is not an error pointer, that means it eventually results in an Oops in the caller. Fixes: d901d6a298dc ("apparmor: dfa split verification of table headers") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-03-23apparmor: fix error returns checks by making size a ssize_tColin Ian King
Currently variable size is a unsigned size_t, hence comparisons to see if it is less than zero (for error checking) will always be false. Fix this by making size a ssize_t Detected by CoverityScan, CID#1466080 ("Unsigned compared against 0") Fixes: 8e51f9087f40 ("apparmor: Add support for attaching profiles via xattr, presence and value") Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-03-13apparmor: remove POLICY_MEDIATES_SAFEJohn Johansen
The unpack code now makes sure every profile has a dfa so the safe version of POLICY_MEDIATES is no longer needed. Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-03-13apparmor: add base infastructure for socket mediationJohn Johansen
version 2 - Force an abi break. Network mediation will only be available in v8 abi complaint policy. Provide a basic mediation of sockets. This is not a full net mediation but just whether a spcific family of socket can be used by an application, along with setting up some basic infrastructure for network mediation to follow. the user space rule hav the basic form of NETWORK RULE = [ QUALIFIERS ] 'network' [ DOMAIN ] [ TYPE | PROTOCOL ] DOMAIN = ( 'inet' | 'ax25' | 'ipx' | 'appletalk' | 'netrom' | 'bridge' | 'atmpvc' | 'x25' | 'inet6' | 'rose' | 'netbeui' | 'security' | 'key' | 'packet' | 'ash' | 'econet' | 'atmsvc' | 'sna' | 'irda' | 'pppox' | 'wanpipe' | 'bluetooth' | 'netlink' | 'unix' | 'rds' | 'llc' | 'can' | 'tipc' | 'iucv' | 'rxrpc' | 'isdn' | 'phonet' | 'ieee802154' | 'caif' | 'alg' | 'nfc' | 'vsock' | 'mpls' | 'ib' | 'kcm' ) ',' TYPE = ( 'stream' | 'dgram' | 'seqpacket' | 'rdm' | 'raw' | 'packet' ) PROTOCOL = ( 'tcp' | 'udp' | 'icmp' ) eg. network, network inet, Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Seth Arnold <seth.arnold@canonical.com>
2018-03-07usb, signal, security: only pass the cred, not the secid, to ↵Stephen Smalley
kill_pid_info_as_cred and security_task_kill commit d178bc3a708f39cbfefc3fab37032d3f2511b4ec ("user namespace: usb: make usb urbs user namespace aware (v2)") changed kill_pid_info_as_uid to kill_pid_info_as_cred, saving and passing a cred structure instead of uids. Since the secid can be obtained from the cred, drop the secid fields from the usb_dev_state and async structures, and drop the secid argument to kill_pid_info_as_cred. Replace the secid argument to security_task_kill with the cred. Update SELinux, Smack, and AppArmor to use the cred, which avoids the need for Smack and AppArmor to use a secid at all in this hook. Further changes to Smack might still be required to take full advantage of this change, since it should now be possible to perform capability checking based on the supplied cred. The changes to Smack and AppArmor have only been compile-tested. Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: Paul Moore <paul@paul-moore.com> Acked-by: Casey Schaufler <casey@schaufler-ca.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <james.morris@microsoft.com>
2018-02-11vfs: do bulk POLL* -> EPOLL* replacementLinus Torvalds
This is the mindless scripted replacement of kernel use of POLL* variables as described by Al, done by this script: for V in IN OUT PRI ERR RDNORM RDBAND WRNORM WRBAND HUP RDHUP NVAL MSG; do L=`git grep -l -w POLL$V | grep -v '^t' | grep -v /um/ | grep -v '^sa' | grep -v '/poll.h$'|grep -v '^D'` for f in $L; do sed -i "-es/^\([^\"]*\)\(\<POLL$V\>\)/\\1E\\2/" $f; done done with de-mangling cleanups yet to come. NOTE! On almost all architectures, the EPOLL* constants have the same values as the POLL* constants do. But they keyword here is "almost". For various bad reasons they aren't the same, and epoll() doesn't actually work quite correctly in some cases due to this on Sparc et al. The next patch from Al will sort out the final differences, and we should be all done. Scripted-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-02-09apparmor: improve overlapping domain attachment resolutionJohn Johansen
Overlapping domain attachments using the current longest left exact match fail in some simple cases, and with the fix to ensure consistent behavior by failing unresolvable attachments it becomes important to do a better job. eg. under the current match the following are unresolvable where the alternation is clearly a better match under the most specific left match rule. /** /{bin/,}usr/ Use a counting match that detects when a loop in the state machine is enter, and return the match count to provide a better specific left match resolution. Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-02-09apparmor: convert attaching profiles via xattrs to use dfa matchingJohn Johansen
This converts profile attachment based on xattrs to a fixed extended conditional using dfa matching. This has a couple of advantages - pattern matching can be used for the xattr match - xattrs can be optional for an attachment or marked as required - the xattr attachment conditional will be able to be combined with other extended conditionals when the flexible extended conditional work lands. The xattr fixed extended conditional is appended to the xmatch conditional. If an xattr attachment is specified the profile xmatch will be generated regardless of whether there is a pattern match on the executable name. Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Seth Arnold <seth.arnold@canonical.com>
2018-02-09apparmor: Add support for attaching profiles via xattr, presence and valueMatthew Garrett
Make it possible to tie Apparmor profiles to the presence of one or more extended attributes, and optionally their values. An example usecase for this is to automatically transition to a more privileged Apparmor profile if an executable has a valid IMA signature, which can then be appraised by the IMA subsystem. Signed-off-by: Matthew Garrett <mjg59@google.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-02-09apparmor: cleanup: simplify code to get ns symlink nameJohn Johansen
ns_get_name() is called in only one place and can be folded in. Signed-off-by: John Johansen <john.johansen@canonical.com>
2018-02-09apparmor: cleanup create_aafs() error pathJohn Johansen
Signed-off-by: John Johansen <john.johansen@canonical.com>
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-05-18 05:18:30 +0000