RHEL 4 configuration (final info)
by Robert Evans
Hi,
Got things working on RHEL 64 bit (my target platform). Figured I'd post my
final results.
I was able to get login/logout auditing to work on RHEL 4 by updating the
following packages from the original distribution.
kernel-smp-2.6.9-55.EL.x86_64 (or non-smp)
kernel-smp-devel-2.6.9-55.EL.x86_64 (or non-smp)
glibc-kernheaders-2.4_9.1.100.EL.x86_64
audit-libs-1.0.15-3.EL4.x86_64
audit-1.0.15-3.EL4.x86_64
gdm-2.6.0.5-7.rhel4.15.x86_64.rpm
glibc-kernheaders-2.4-9.1.100.EL.x86_64.rpm
openssh-3.9p1-8.RHEL4.17.1.x86_64.rpm
openssh-askpass-3.9p1-8.RHEL4.17.1.x86_64.rpm
openssh-askpass-gnome-3.9p1-8.RHEL4.17.1.x86_64.rpm
openssh-clients-3.9p1-8.RHEL4.17.1.x86_64.rpm
openssh-server-3.9p1-8.RHEL4.17.1.x86_64.rpm
pam-0.77-66.21.x86_64.rpm
This give me enough info that I can generate failed and successful logins for
gdm/ssh/su and also generate logout information. Turns out that the version of
ssh available for RHEL4 doesn't generate a USER_END event, but does generate a
CRED_DISP event which is good enough for my GUI to generate viewable logs.
One note of interest, in earlier posts, it was recommended to set audit=1 in
/etc/grub.conf. I found that if I did so it suppressed login/logout information.
Bob Evans
JHU/APL
17 years, 6 months
RHEL 4 configuration (more info)
by Robert Evans
Updated info on my question.
From the original message:
>>>> original question <<<<
I've got auditing running pretty well on Fedora and looks like SuSE as well, but
RHEL 4 is giving me some problems.
I'm working off of RHEL 4 with the following updated packages:
kernel-smp-2.6.9-55.EL.x86_64
kernel-smp-devel-2.6.9-55.EL.x86_64
glibc-kernheaders-2.4_9.1.100.EL.x86_64
audit-libs-1.0.15-3.EL4.x86_64
audit-1.0.15-3.EL4.x86_64
All other packages are at the original RHEL4 distribution level.
>>>> Updated info <<<<<
It turns out I had the audit=1 flag set in /etc/grub.conf. I thought I was
supposed to include that, but if I removed that, I saw the login/logout
events...so my original problem is resolved.
Now I'm back to my old problem of SSH doesn't show logouts. I know that the
version on RHEL 4 is too old to generate the logouts, but I don't see a new
enough version of packages for openssh on redhat.com.
I see newer versions of openssh on openssh.org, but I tried to compile those,
and use the sshd daemon in place of the one on the distro, and still no luck on ssh.
Are there "magic" flags I need to set if I compile openssh myself, or any
special configuration options to have it work with auditd?
Thanks again!
Bob Evans
17 years, 6 months
RHEL 4 configuration
by Robert Evans
Hi,
I've got auditing running pretty well on Fedora and looks like SuSE as well, but
RHEL 4 is giving me some problems.
I'm working off of RHEL 4 with the following updated packages:
kernel-smp-2.6.9-55.EL.x86_64
kernel-smp-devel-2.6.9-55.EL.x86_64
glibc-kernheaders-2.4_9.1.100.EL.x86_64
audit-libs-1.0.15-3.EL4.x86_64
audit-1.0.15-3.EL4.x86_64
All other packages are at the original RHEL4 distribution level.
I'm seeing SYSCALL events, but no login/logout/su/ssh events. Steve had earlier
mentioned that login/logout/ssh/gdm events are managed by the pam modules. Are
there other packages I need to update to get login/logout events working?
As an extra topic, what is the maturity of RHEL5 w/ regard to auditing?
Bob Evans
JHU/APL
17 years, 6 months
Auditd hangs hard
by Matthew Booth
I have a test server on which, if left to its own devices, the audit
daemon will lock up hard. The most obvious symptoms are:
* An attempt to read /proc/<auditd pid>/ will hang
* auditd cannot be killed with -9
* The logs are full of backlog exceeded messages.
The system in question is doing some fairly severe system call auditing.
The audit daemon is configured not to write to disk at all. Instead it
uses a custom dispatcher which directly wraps the audit messages as a
syslog message and sends it directly via UDP to a central host. The
change which prompted this behaviour seems to be the installation of LSF
analytics, which is quite exceptionally noisy from a syscall POV.
The system is RHEL 4 x86_64 running:
audit-1.0.15-3.EL4
kernel-smp-2.6.9-42.0.8.EL
It's basically RHEL 4 U4 with auditd from U5. Any ideas what might be
causing this, or how to debug?
Thanks,
Matt
--
Matthew Booth, RHCA, RHCSS
Red Hat, Global Professional Services
M: +44 (0)7977 267231
GPG ID: D33C3490
GPG FPR: 3733 612D 2D05 5458 8A8A 1600 3441 EA19 D33C 3490
17 years, 6 months
Not trapping 'symlink' system call
by Eric Howard
Ah, I see my mistake. I was using 'possible' instead of 'always'. Thanks for your help!
-- Eric --
Steve Grubb sgrubb-at-redhat.com |redhat-audit-mailing-list| wrote:
> On Wednesday 06 June 2007 14:40, Eric Howard wrote:
>> I have been tasked to generate test cases to validate the proper execution
>> of particular syscall audit flags.
>
> I think HP open sourced a test suite that tests the audit system:
> http://sourceforge.net/projects/audit-test
>
>> In most cases I have succeeded in triggering audit log entries. However, I
>> have been unable to trigger audit entries for the 'symlink call' My test
>> cases are generated by a shell script that execute commands to trigger the
>> relevant calls. In my test case I created a hard-link and a soft-link
>> using /bin/ln. Running strace indicated that the syscall was definitely
>> made but 'ausearch -sc symlink' shows nothing. I am using
>> audit-1.0.15-3.EL4. Any insight into this problem would be appreciated.
>
> Looking at the syscalls, it should trigger on something like:
>
> auditctl -a always,exit -S symlink
>
> Or were you testing it another way?
>
> -Steve
>
--------------------------------------
Protect yourself from spam,
use http://sneakemail.com
17 years, 7 months
Not trapping 'symlink' system call
by Eric Howard
I have been tasked to generate test cases to validate the proper execution of particular syscall audit flags. In most cases I have succeeded in triggering audit log entries. However, I have been unable to trigger audit entries for the 'symlink call' My test cases are generated by a shell script that execute commands to trigger the relevant calls. In my test case I created a hard-link and a soft-link using /bin/ln. Running strace indicated that the syscall was definitely made but 'ausearch -sc symlink' shows nothing. I am using audit-1.0.15-3.EL4. Any insight into this problem would be appreciated.
Sincerely,
Eric Howard
--------------------------------------
Protect yourself from spam,
use http://sneakemail.com
17 years, 7 months
- audit-rework-execve-audit-fix.patch removed from -mm tree
by akpm＠linux-foundation.org
The patch titled
audit-rework-execve-audit-fix
has been removed from the -mm tree. Its filename was
audit-rework-execve-audit-fix.patch
This patch was dropped because an updated version will be merged
------------------------------------------------------
Subject: audit-rework-execve-audit-fix
From: Andrew Morton <akpm(a)linux-foundation.org>
Cc: <linux-audit(a)redhat.com>
Cc: Al Viro <viro(a)zeniv.linux.org.uk>
Cc: Ollie Wild <aaw(a)google.com>
Cc: Peter Zijlstra <a.p.zijlstra(a)chello.nl>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
---
kernel/auditsc.c | 2 +-
1 files changed, 1 insertion(+), 1 deletion(-)
diff -puN kernel/auditsc.c~audit-rework-execve-audit-fix kernel/auditsc.c
--- a/kernel/auditsc.c~audit-rework-execve-audit-fix
+++ a/kernel/auditsc.c
@@ -865,7 +865,7 @@ static void audit_log_execve_info(struct
/*
* There is no reason for this copy to be short.
*/
- BUG_ON(ret);
+ WARN_ON(ret);
audit_log_format(ab, "a%d=", i);
audit_log_untrustedstring(ab, tmp);
_
Patches currently in -mm which might be from akpm(a)linux-foundation.org are
document-acked-by.patch
git-acpi.patch
git-acpi-tickh-needs-hrtimerh.patch
git-acpi-add-exports.patch
working-3d-dri-intel-agpko-resume-for-i815-chip.patch
git-avr32.patch
git-cpufreq-fix.patch
bugfix-cpufreq-in-combination-with-performance-governor-fix.patch
8xx-mpc885ads-pcmcia-support.patch
driver-core-check-return-code-of-sysfs_create_link.patch
git-dvb.patch
git-gfs2-nmw.patch
git-input.patch
git-input-fixup.patch
git-kbuild.patch
git-kvm.patch
git-leds.patch
drivers-ata-add-sw-ncq-support-to-sata_nv-for-mcp51-mcp55-mcp61.patch
git-md-accel.patch
git-md-accel-fixup.patch
git-mips-fixup.patch
use-mutex-instead-of-semaphore-in-the-mtd-st-m25pxx-driver.patch
git-ubi.patch
sundance-phy-address-form-0-only-for-device-id-0x0200-fix.patch
wrong-timeout-value-in-sk_wait_data-v2-fix.patch
git-battery.patch
git-nfs-server-cluster-locking-api-fixup.patch
git-parisc.patch
pci-x-pci-express-read-control-interfaces-fix.patch
git-scsi-misc.patch
scsi-dont-build-scsi_dma_mapunmap-for-has_dma-fix.patch
git-unionfs.patch
fix-gregkh-usb-usb-ehci-cpufreq-fix.patch
git-wireless.patch
x86_64-mm-xen-attempt-to-patch-inline-versions-of-common-operations.patch
revert-x86_64-mm-verify-cpu-rename.patch
revert-x86_64-mm-allocate-sparsemem-memmap-above-4g-on-x86_64.patch
revert-x86_64-mm-cpa-cache-flush.patch
fix-x86_64-numa-fake-apicid_to_node-mapping-for-fake-numa-2.patch
fix-x86_64-mm-sched-clock-share.patch
i386-add-support-for-picopower-irq-router.patch
x86_64-extract-helper-function-from-e820_register_active_regions.patch
mmconfig-x86_64-i386-insert-unclaimed-mmconfig-resources.patch
x86_64-fix-smp_call_function_single-return-value.patch
i386-flush_tlb_kernel_range-add-reference-to-the-arguments.patch
x86_64-irq-check-remote-irr-bit-before-migrating-level-triggered-irq-v3.patch
x86-64-calgary-introduce-chipset-specific-ops-fix.patch
x86-64-calgary-add-chip_ops-and-a-quirk-function-for-calioc2-fix.patch
x86-64-calgary-reserve-tces-with-the-same-address-as-mem-regions-fix.patch
i386-do-not-restore-reserved-memory-after-hibernation-fix.patch
paravirt-helper-to-disable-all-io-space-fix.patch
git-xfs.patch
git-cryptodev.patch
git-xtensa.patch
acpi-preserve-the-ebx-value-in-acpi_copy_wakeup_routine.patch
vmscan-give-referenced-active-and-unmapped-pages-a-second-trip-around-the-lru.patch
change-zonelist-order-v6-zonelist-fix.patch
rework-ptep_set_access_flags-and-fix-sun4c-fix.patch
rework-ptep_set_access_flags-and-fix-sun4c-fix-fix.patch
mm-merge-populate-and-nopage-into-fault-fixes-nonlinear.patch
mm-merge-nopfn-into-fault.patch
invalidate_mapping_pages-add-cond_resched.patch
slub-support-slub_debug-on-by-default-tidy.patch
numa-mempolicy-allow-tunable-policy-for-system-init-fix.patch
nick-broke-stuff.patch
nick-broke-more-stuff.patch
nick-broke-even-more-stuff.patch
nick-really-did-it-this-time.patch
add-__gfp_movable-for-callers-to-flag-allocations-from-high-memory-that-may-be-migrated.patch
bias-the-location-of-pages-freed-for-min_free_kbytes-in-the-same-max_order_nr_pages-blocks.patch
create-the-zone_movable-zone-fix.patch
allow-huge-page-allocations-to-use-gfp_high_movable-fix.patch
allow-huge-page-allocations-to-use-gfp_high_movable-fix-2.patch
maps2-move-the-page-walker-code-to-lib.patch
maps2-move-the-page-walker-code-to-lib-fix.patch
maps2-add-proc-pid-pagemap-interface.patch
slub-change-error-reporting-format-to-follow-lockdep-loosely-fix.patch
fs-introduce-some-page-buffer-invariants-obnoxiousness.patch
freezer-make-kernel-threads-nonfreezable-by-default-fix.patch
freezer-make-kernel-threads-nonfreezable-by-default-fix-fix.patch
freezer-run-show_state-when-freezing-times-out.patch
pm-introduce-hibernation-and-suspend-notifiers-fix.patch
pm-introduce-hibernation-and-suspend-notifiers-tidy.patch
pm-introduce-hibernation-and-suspend-notifiers-fix-fix.patch
pm-disable-usermode-helper-before-hibernation-and-suspend-fix.patch
cache-pipe-buf-page-address-for-non-highmem-arch.patch
fix-rmmod-read-write-races-in-proc-entries-fix.patch
use-write_trylock_irqsave-in-ptrace_attach-fix.patch
use-no_pci_devices-in-pci-searchc.patch
introduce-boot-based-time-fix.patch
use-boot-based-time-for-process-start-time-and-boot-time-fix.patch
add-argv_split-fix.patch
add-common-orderly_poweroff-fix.patch
cpu-hotplug-fix-ksoftirqd-termination-on-cpu-hotplug-with-naughty-realtime-process-fix.patch
fuse-warning-fix.patch
vxfs-warning-fixes.patch
percpu_counters-use-cpu-notifiers.patch
percpu_counters-use-for_each_online_cpu.patch
mpu401-warning-fixes.patch
procfs-directory-entry-cleanup-fix.patch
vdso-print-fatal-signals.patch
reduce-cpusetc-write_lock_irq-to-read_lock-fix.patch
o_cloexec-for-scm_rights-fix.patch
o_cloexec-for-scm_rights-fix-2.patch
atmel_serial-fix-break-handling.patch
lib-add-idr_for_each-fix.patch
ext3-ext4-orphan-list-check-on-destroy_inode-fix.patch
taskstats-add-context-switch-counters-fix.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-2.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-3.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-4.patch
writeback-fix-comment-use-helper-function.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-5.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-6.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-7.patch
crc7-support-fix.patch
i2o_cfg_passthru-cleanup-fix.patch
knfsd-exportfs-add-exportfsh-header-fix.patch
knfsd-exportfs-remove-iget-abuse-fix.patch
nfsd-warning-fix.patch
revoke-wire-up-i386-system-calls.patch
lguest-the-host-code.patch
lguest-the-host-code-borkages.patch
lguest-the-net-driver-include-fix.patch
fbcon-allow-fbcon-to-use-the-primary-display-driver-fix-2.patch
fbdev-fbcon-console-unregistration-from-unregister_framebuffer-fix.patch
cfs-scheduler-vs-detach-schedh-from-mmh.patch
cfs-scheduler-warning-fixes.patch
cfs-warning-fixes.patch
kernel-doc-fix-leading-dot-in-man-mode-output-fix.patch
coredump-masking-reimplementation-of-dumpable-using-two-flags-fix.patch
audit-rework-execve-audit-fix.patch
mm-variable-length-argument-support-fix.patch
containersv10-basic-container-framework-fix.patch
containersv10-example-cpu-accounting-subsystem-fix.patch
containersv10-add-tasks-file-interface-fix.patch
containersv10-add-fork-exit-hooks-fix.patch
containersv10-add-container_clone-interface-fix.patch
containersv10-add-procfs-interface-fix.patch
containersv10-share-css_group-arrays-between-tasks-with-same-container-memberships-fix.patch
containersv10-simple-debug-info-subsystem-fix.patch
containersv10-simple-debug-info-subsystem-fix-2.patch
lockstat-core-infrastructure-fix.patch
lockstat-core-infrastructure-fix-fix.patch
reiser4.patch
reiser4-fix.patch
nick-broke-reiser4-too.patch
check_dirty_inode_list.patch
w1-build-fix.patch
revert-mmconfig-validate-against-acpi-motherboard-resources.patch
revert-slub-use-ilog2-instead-of-series-of-constant-comparisons.patch
17 years, 7 months
- audit-rework-execve-audit.patch removed from -mm tree
by akpm＠linux-foundation.org
The patch titled
audit: rework execve audit
has been removed from the -mm tree. Its filename was
audit-rework-execve-audit.patch
This patch was dropped because an updated version will be merged
------------------------------------------------------
Subject: audit: rework execve audit
From: Peter Zijlstra <a.p.zijlstra(a)chello.nl>
The purpose of audit_bprm() is to log the argv array to a userspace daemon at
the end of the execve system call. Since user-space hasn't had time to run,
this array is still in pristine state on the process' stack; so no need to
copy it, we can just grab it from there.
In order to minimize the damage to audit_log_*() copy each string into a
temporary kernel buffer first.
Currently the audit code requires that the full argument vector fits in a
single packet. So currently it does clip the argv size to a (sysctl) limit,
but only when execve auditing is enabled.
If the audit protocol gets extended to allow for multiple packets this check
can be removed.
Signed-off-by: Peter Zijlstra <a.p.zijlstra(a)chello.nl>
Signed-off-by: Ollie Wild <aaw(a)google.com>
Cc: Al Viro <viro(a)zeniv.linux.org.uk>
Cc: <linux-audit(a)redhat.com>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
---
fs/exec.c | 3 +
include/linux/binfmts.h | 1
kernel/auditsc.c | 76 +++++++++++++++++++++++++++-----------
kernel/sysctl.c | 11 +++++
4 files changed, 70 insertions(+), 21 deletions(-)
diff -puN fs/exec.c~audit-rework-execve-audit fs/exec.c
--- a/fs/exec.c~audit-rework-execve-audit
+++ a/fs/exec.c
@@ -1154,6 +1154,7 @@ int do_execve(char * filename,
{
struct linux_binprm *bprm;
struct file *file;
+ unsigned long tmp;
int retval;
int i;
@@ -1208,9 +1209,11 @@ int do_execve(char * filename,
if (retval < 0)
goto out;
+ tmp = bprm->p;
retval = copy_strings(bprm->argc, argv, bprm);
if (retval < 0)
goto out;
+ bprm->argv_len = tmp - bprm->p;
retval = search_binary_handler(bprm,regs);
if (retval >= 0) {
diff -puN include/linux/binfmts.h~audit-rework-execve-audit include/linux/binfmts.h
--- a/include/linux/binfmts.h~audit-rework-execve-audit
+++ a/include/linux/binfmts.h
@@ -40,6 +40,7 @@ struct linux_binprm{
unsigned interp_flags;
unsigned interp_data;
unsigned long loader, exec;
+ unsigned long argv_len;
};
#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
diff -puN kernel/auditsc.c~audit-rework-execve-audit kernel/auditsc.c
--- a/kernel/auditsc.c~audit-rework-execve-audit
+++ a/kernel/auditsc.c
@@ -156,7 +156,7 @@ struct audit_aux_data_execve {
struct audit_aux_data d;
int argc;
int envc;
- char mem[0];
+ struct mm_struct *mm;
};
struct audit_aux_data_socketcall {
@@ -834,6 +834,47 @@ static int audit_log_pid_context(struct
return rc;
}
+static void audit_log_execve_info(struct audit_buffer *ab,
+ struct audit_aux_data_execve *axi)
+{
+ int i;
+ long len;
+ const char __user *p = (const char __user *)axi->mm->arg_start;
+
+ if (axi->mm != current->mm)
+ return; /* execve failed, no additional info */
+
+ for (i = 0; i < axi->argc; i++, p += len) {
+ long ret;
+ char *tmp;
+
+ len = strnlen_user(p, MAX_ARG_PAGES*PAGE_SIZE);
+ /*
+ * We just created this mm, if we can't find the strings
+ * we just copied in something is _very_ wrong.
+ */
+ BUG_ON(!len);
+
+ tmp = kmalloc(len, GFP_KERNEL);
+ if (!tmp) {
+ audit_panic("out of memory for argv string\n");
+ break;
+ }
+
+ ret = copy_from_user(tmp, p, len);
+ /*
+ * There is no reason for this copy to be short.
+ */
+ BUG_ON(ret);
+
+ audit_log_format(ab, "a%d=", i);
+ audit_log_untrustedstring(ab, tmp);
+ audit_log_format(ab, "\n");
+
+ kfree(tmp);
+ }
+}
+
static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
{
int i, call_panic = 0;
@@ -974,13 +1015,7 @@ static void audit_log_exit(struct audit_
case AUDIT_EXECVE: {
struct audit_aux_data_execve *axi = (void *)aux;
- int i;
- const char *p;
- for (i = 0, p = axi->mem; i < axi->argc; i++) {
- audit_log_format(ab, "a%d=", i);
- p = audit_log_untrustedstring(ab, p);
- audit_log_format(ab, "\n");
- }
+ audit_log_execve_info(ab, axi);
break; }
case AUDIT_SOCKETCALL: {
@@ -1824,32 +1859,31 @@ int __audit_ipc_set_perm(unsigned long q
return 0;
}
+int audit_argv_kb = 32;
+
int audit_bprm(struct linux_binprm *bprm)
{
struct audit_aux_data_execve *ax;
struct audit_context *context = current->audit_context;
- unsigned long p, next;
- void *to;
if (likely(!audit_enabled || !context || context->dummy))
return 0;
- ax = kmalloc(sizeof(*ax) + PAGE_SIZE * MAX_ARG_PAGES - bprm->p,
- GFP_KERNEL);
+ /*
+ * Even though the stack code doesn't limit the arg+env size any more,
+ * the audit code requires that _all_ arguments be logged in a single
+ * netlink skb. Hence cap it :-(
+ */
+ if (bprm->argv_len > (audit_argv_kb << 10))
+ return -E2BIG;
+
+ ax = kmalloc(sizeof(*ax), GFP_KERNEL);
if (!ax)
return -ENOMEM;
ax->argc = bprm->argc;
ax->envc = bprm->envc;
- for (p = bprm->p, to = ax->mem; p < MAX_ARG_PAGES*PAGE_SIZE; p = next) {
- struct page *page = bprm->page[p / PAGE_SIZE];
- void *kaddr = kmap(page);
- next = (p + PAGE_SIZE) & ~(PAGE_SIZE - 1);
- memcpy(to, kaddr + (p & (PAGE_SIZE - 1)), next - p);
- to += next - p;
- kunmap(page);
- }
-
+ ax->mm = bprm->mm;
ax->d.type = AUDIT_EXECVE;
ax->d.next = context->aux;
context->aux = (void *)ax;
diff -puN kernel/sysctl.c~audit-rework-execve-audit kernel/sysctl.c
--- a/kernel/sysctl.c~audit-rework-execve-audit
+++ a/kernel/sysctl.c
@@ -81,6 +81,7 @@ extern int percpu_pagelist_fraction;
extern int compat_log;
extern int maps_protect;
extern int sysctl_stat_interval;
+extern int audit_argv_kb;
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
static int maxolduid = 65535;
@@ -266,6 +267,16 @@ static ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = &proc_dointvec,
},
+#ifdef CONFIG_AUDITSYSCALL
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "audit_argv_kb",
+ .data = &audit_argv_kb,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+#endif
{
.ctl_name = KERN_CORE_USES_PID,
.procname = "core_uses_pid",
_
Patches currently in -mm which might be from a.p.zijlstra(a)chello.nl are
lumpy-reclaim-v4.patch
split-mmap.patch
only-allow-nonlinear-vmas-for-ram-backed-filesystems.patch
percpu_counters-use-cpu-notifiers.patch
percpu_counters-use-for_each_online_cpu.patch
audit-rework-execve-audit.patch
audit-rework-execve-audit-fix.patch
mm-move_page_tables_up.patch
mm-variable-length-argument-support.patch
mm-variable-length-argument-support-fix.patch
fix-raw_spinlock_t-vs-lockdep.patch
lockdep-sanitise-config_prove_locking.patch
lockdep-reduce-the-ifdeffery.patch
lockstat-core-infrastructure.patch
lockstat-core-infrastructure-fix.patch
lockstat-core-infrastructure-fix-fix.patch
lockstat-human-readability-tweaks.patch
lockstat-human-readability-tweaks-fix.patch
lockstat-hook-into-spinlock_t-rwlock_t-rwsem-and-mutex.patch
17 years, 7 months
[PATCH 2/4] audit: rework execve audit
by Peter Zijlstra
The purpose of audit_bprm() is to log the argv array to a userspace daemon at
the end of the execve system call. Since user-space hasn't had time to run,
this array is still in pristine state on the process' stack; so no need to copy
it, we can just grab it from there.
In order to minimize the damage to audit_log_*() copy each string into a
temporary kernel buffer first.
Currently the audit code requires that the full argument vector fits in a
single packet. So currently it does clip the argv size to a (sysctl) limit, but
only when execve auditing is enabled.
If the audit protocol gets extended to allow for multiple packets this check
can be removed.
Signed-off-by: Peter Zijlstra <a.p.zijlstra(a)chello.nl>
Signed-off-by: Ollie Wild <aaw(a)google.com>
Cc: linux-audit(a)redhat.com
---
fs/exec.c | 3 +
include/linux/binfmts.h | 1
include/linux/sysctl.h | 1
kernel/audit.c | 16 +++++++++
kernel/audit.h | 1
kernel/auditsc.c | 82 ++++++++++++++++++++++++++++++++----------------
kernel/sysctl.c | 11 ++++++
7 files changed, 89 insertions(+), 26 deletions(-)
Index: linux-2.6-2/kernel/auditsc.c
===================================================================
--- linux-2.6-2.orig/kernel/auditsc.c 2007-06-05 09:51:53.000000000 +0200
+++ linux-2.6-2/kernel/auditsc.c 2007-06-05 10:03:31.000000000 +0200
@@ -156,7 +156,7 @@ struct audit_aux_data_execve {
struct audit_aux_data d;
int argc;
int envc;
- char mem[0];
+ struct mm_struct *mm;
};
struct audit_aux_data_socketcall {
@@ -834,6 +834,47 @@ static int audit_log_pid_context(struct
return rc;
}
+static void audit_log_execve_info(struct audit_buffer *ab,
+ struct audit_aux_data_execve *axi)
+{
+ int i;
+ long len;
+ const char __user *p = (const char __user *)axi->mm->arg_start;
+
+ if (axi->mm != current->mm)
+ return; /* execve failed, no additional info */
+
+ for (i = 0; i < axi->argc; i++, p += len) {
+ long ret;
+ char *tmp;
+
+ len = strnlen_user(p, MAX_ARG_PAGES*PAGE_SIZE);
+ /*
+ * We just created this mm, if we can't find the strings
+ * we just copied in something is _very_ wrong.
+ */
+ BUG_ON(!len);
+
+ tmp = kmalloc(len, GFP_KERNEL);
+ if (!tmp) {
+ audit_panic("out of memory for argv string\n");
+ break;
+ }
+
+ ret = copy_from_user(tmp, p, len);
+ /*
+ * There is no reason for this copy to be short.
+ */
+ BUG_ON(ret);
+
+ audit_log_format(ab, "a%d=", i);
+ audit_log_untrustedstring(ab, tmp);
+ audit_log_format(ab, "\n");
+
+ kfree(tmp);
+ }
+}
+
static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
{
int i, call_panic = 0;
@@ -974,13 +1016,7 @@ static void audit_log_exit(struct audit_
case AUDIT_EXECVE: {
struct audit_aux_data_execve *axi = (void *)aux;
- int i;
- const char *p;
- for (i = 0, p = axi->mem; i < axi->argc; i++) {
- audit_log_format(ab, "a%d=", i);
- p = audit_log_untrustedstring(ab, p);
- audit_log_format(ab, "\n");
- }
+ audit_log_execve_info(ab, axi);
break; }
case AUDIT_SOCKETCALL: {
@@ -1824,32 +1860,31 @@ int __audit_ipc_set_perm(unsigned long q
return 0;
}
+int audit_argv_kb = 32;
+
int audit_bprm(struct linux_binprm *bprm)
{
struct audit_aux_data_execve *ax;
struct audit_context *context = current->audit_context;
- unsigned long p, next;
- void *to;
if (likely(!audit_enabled || !context || context->dummy))
return 0;
- ax = kmalloc(sizeof(*ax) + PAGE_SIZE * MAX_ARG_PAGES - bprm->p,
- GFP_KERNEL);
+ /*
+ * Even though the stack code doesn't limit the arg+env size any more,
+ * the audit code requires that _all_ arguments be logged in a single
+ * netlink skb. Hence cap it :-(
+ */
+ if (bprm->argv_len > (audit_argv_kb << 10))
+ return -E2BIG;
+
+ ax = kmalloc(sizeof(*ax), GFP_KERNEL);
if (!ax)
return -ENOMEM;
ax->argc = bprm->argc;
ax->envc = bprm->envc;
- for (p = bprm->p, to = ax->mem; p < MAX_ARG_PAGES*PAGE_SIZE; p = next) {
- struct page *page = bprm->page[p / PAGE_SIZE];
- void *kaddr = kmap(page);
- next = (p + PAGE_SIZE) & ~(PAGE_SIZE - 1);
- memcpy(to, kaddr + (p & (PAGE_SIZE - 1)), next - p);
- to += next - p;
- kunmap(page);
- }
-
+ ax->mm = bprm->mm;
ax->d.type = AUDIT_EXECVE;
ax->d.next = context->aux;
context->aux = (void *)ax;
Index: linux-2.6-2/fs/exec.c
===================================================================
--- linux-2.6-2.orig/fs/exec.c 2007-06-05 09:51:42.000000000 +0200
+++ linux-2.6-2/fs/exec.c 2007-06-05 10:03:11.000000000 +0200
@@ -1154,6 +1154,7 @@ int do_execve(char * filename,
{
struct linux_binprm *bprm;
struct file *file;
+ unsigned long tmp;
int retval;
int i;
@@ -1208,9 +1209,11 @@ int do_execve(char * filename,
if (retval < 0)
goto out;
+ tmp = bprm->p;
retval = copy_strings(bprm->argc, argv, bprm);
if (retval < 0)
goto out;
+ bprm->argv_len = tmp - bprm->p;
retval = search_binary_handler(bprm,regs);
if (retval >= 0) {
Index: linux-2.6-2/include/linux/binfmts.h
===================================================================
--- linux-2.6-2.orig/include/linux/binfmts.h 2007-06-05 09:51:44.000000000 +0200
+++ linux-2.6-2/include/linux/binfmts.h 2007-06-05 10:03:11.000000000 +0200
@@ -40,6 +40,7 @@ struct linux_binprm{
unsigned interp_flags;
unsigned interp_data;
unsigned long loader, exec;
+ unsigned long argv_len;
};
#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
Index: linux-2.6-2/kernel/sysctl.c
===================================================================
--- linux-2.6-2.orig/kernel/sysctl.c 2007-06-05 09:51:53.000000000 +0200
+++ linux-2.6-2/kernel/sysctl.c 2007-06-05 10:04:05.000000000 +0200
@@ -78,6 +78,7 @@ extern int percpu_pagelist_fraction;
extern int compat_log;
extern int maps_protect;
extern int sysctl_stat_interval;
+extern int audit_argv_kb;
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
static int maxolduid = 65535;
@@ -615,6 +616,16 @@ static ctl_table kern_table[] = {
.proc_handler = &proc_dointvec,
},
#endif
+#ifdef CONFIG_AUDITSYSCALL
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "audit_argv_kb",
+ .data = &audit_argv_kb,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+#endif
{ .ctl_name = 0 }
};
--
17 years, 7 months
+ audit-rework-execve-audit-fix.patch added to -mm tree
by akpm＠linux-foundation.org
The patch titled
audit-rework-execve-audit-fix
has been added to the -mm tree. Its filename is
audit-rework-execve-audit-fix.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: audit-rework-execve-audit-fix
From: Andrew Morton <akpm(a)linux-foundation.org>
Cc: <linux-audit(a)redhat.com>
Cc: Al Viro <viro(a)zeniv.linux.org.uk>
Cc: Ollie Wild <aaw(a)google.com>
Cc: Peter Zijlstra <a.p.zijlstra(a)chello.nl>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
---
kernel/auditsc.c | 2 +-
1 files changed, 1 insertion(+), 1 deletion(-)
diff -puN kernel/auditsc.c~audit-rework-execve-audit-fix kernel/auditsc.c
--- a/kernel/auditsc.c~audit-rework-execve-audit-fix
+++ a/kernel/auditsc.c
@@ -865,7 +865,7 @@ static void audit_log_execve_info(struct
/*
* There is no reason for this copy to be short.
*/
- BUG_ON(ret);
+ WARN_ON(ret);
audit_log_format(ab, "a%d=", i);
audit_log_untrustedstring(ab, tmp);
_
Patches currently in -mm which might be from akpm(a)linux-foundation.org are
document-acked-by.patch
git-acpi.patch
git-acpi-tickh-needs-hrtimerh.patch
working-3d-dri-intel-agpko-resume-for-i815-chip.patch
git-avr32.patch
git-cpufreq-fix.patch
8xx-mpc885ads-pcmcia-support.patch
driver-core-check-return-code-of-sysfs_create_link.patch
git-dvb.patch
git-gfs2-nmw.patch
git-input.patch
git-input-fixup.patch
git-kbuild.patch
git-kvm.patch
git-leds.patch
drivers-ata-add-sw-ncq-support-to-sata_nv-for-mcp51-mcp55-mcp61.patch
git-mips-fixup.patch
use-mutex-instead-of-semaphore-in-the-mtd-st-m25pxx-driver.patch
git-ubi.patch
sundance-phy-address-form-0-only-for-device-id-0x0200-fix.patch
wrong-timeout-value-in-sk_wait_data-v2-fix.patch
git-battery.patch
git-nfs-server-cluster-locking-api-fixup.patch
git-parisc.patch
revert-gregkh-pci-pci-reduce-aer-init-error-information.patch
pci-x-pci-express-read-control-interfaces-fix.patch
git-scsi-misc.patch
scsi-dont-build-scsi_dma_mapunmap-for-has_dma-fix.patch
git-unionfs.patch
fix-gregkh-usb-usb-ehci-cpufreq-fix.patch
git-wireless.patch
x86_64-mm-xen-attempt-to-patch-inline-versions-of-common-operations.patch
revert-x86_64-mm-allocate-sparsemem-memmap-above-4g-on-x86_64.patch
fix-x86_64-numa-fake-apicid_to_node-mapping-for-fake-numa-2.patch
fix-x86_64-mm-sched-clock-share.patch
i386-add-support-for-picopower-irq-router.patch
x86_64-extract-helper-function-from-e820_register_active_regions.patch
mmconfig-x86_64-i386-insert-unclaimed-mmconfig-resources.patch
x86_64-fix-smp_call_function_single-return-value.patch
i386-flush_tlb_kernel_range-add-reference-to-the-arguments.patch
x86_64-irq-check-remote-irr-bit-before-migrating-level-triggered-irq-v3.patch
x86-64-calgary-introduce-chipset-specific-ops-fix.patch
x86-64-calgary-add-chip_ops-and-a-quirk-function-for-calioc2-fix.patch
x86-64-calgary-reserve-tces-with-the-same-address-as-mem-regions-fix.patch
i386-do-not-restore-reserved-memory-after-hibernation-fix.patch
git-xfs.patch
git-cryptodev.patch
git-xtensa.patch
acpi-preserve-the-ebx-value-in-acpi_copy_wakeup_routine.patch
vmscan-give-referenced-active-and-unmapped-pages-a-second-trip-around-the-lru.patch
change-zonelist-order-v6-zonelist-fix.patch
rework-ptep_set_access_flags-and-fix-sun4c-fix.patch
rework-ptep_set_access_flags-and-fix-sun4c-fix-fix.patch
mm-merge-populate-and-nopage-into-fault-fixes-nonlinear.patch
mm-merge-nopfn-into-fault.patch
invalidate_mapping_pages-add-cond_resched.patch
slub-support-slub_debug-on-by-default-tidy.patch
numa-mempolicy-allow-tunable-policy-for-system-init-fix.patch
nick-broke-stuff.patch
nick-broke-more-stuff.patch
nick-broke-even-more-stuff.patch
nick-really-did-it-this-time.patch
add-__gfp_movable-for-callers-to-flag-allocations-from-high-memory-that-may-be-migrated.patch
bias-the-location-of-pages-freed-for-min_free_kbytes-in-the-same-max_order_nr_pages-blocks.patch
create-the-zone_movable-zone-fix.patch
allow-huge-page-allocations-to-use-gfp_high_movable-fix.patch
allow-huge-page-allocations-to-use-gfp_high_movable-fix-2.patch
maps2-move-the-page-walker-code-to-lib.patch
maps2-move-the-page-walker-code-to-lib-fix.patch
maps2-add-proc-pid-pagemap-interface.patch
slub-change-error-reporting-format-to-follow-lockdep-loosely-fix.patch
fs-introduce-some-page-buffer-invariants-obnoxiousness.patch
freezer-make-kernel-threads-nonfreezable-by-default-fix.patch
freezer-make-kernel-threads-nonfreezable-by-default-fix-fix.patch
freezer-run-show_state-when-freezing-times-out.patch
pm-introduce-hibernation-and-suspend-notifiers-tidy.patch
pm-disable-usermode-helper-before-hibernation-and-suspend-fix.patch
cache-pipe-buf-page-address-for-non-highmem-arch.patch
fix-rmmod-read-write-races-in-proc-entries-fix.patch
use-write_trylock_irqsave-in-ptrace_attach-fix.patch
use-no_pci_devices-in-pci-searchc.patch
introduce-boot-based-time-fix.patch
use-boot-based-time-for-process-start-time-and-boot-time-fix.patch
add-argv_split-fix.patch
add-common-orderly_poweroff-fix.patch
cpu-hotplug-fix-ksoftirqd-termination-on-cpu-hotplug-with-naughty-realtime-process-fix.patch
fuse-warning-fix.patch
vxfs-warning-fixes.patch
percpu_counters-use-cpu-notifiers.patch
percpu_counters-use-for_each_online_cpu.patch
mpu401-warning-fixes.patch
procfs-directory-entry-cleanup-fix.patch
vdso-print-fatal-signals.patch
reduce-cpusetc-write_lock_irq-to-read_lock-fix.patch
o_cloexec-for-scm_rights-fix.patch
o_cloexec-for-scm_rights-fix-2.patch
atmel_serial-fix-break-handling.patch
lib-add-idr_for_each-fix.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-2.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-3.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-4.patch
writeback-fix-comment-use-helper-function.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-5.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-6.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-7.patch
crc7-support-fix.patch
i2o_cfg_passthru-cleanup-fix.patch
knfsd-exportfs-add-exportfsh-header-fix.patch
knfsd-exportfs-remove-iget-abuse-fix.patch
nfsd-warning-fix.patch
revoke-wire-up-i386-system-calls.patch
lguest-the-host-code.patch
lguest-the-host-code-borkages.patch
lguest-the-net-driver-include-fix.patch
fbcon-allow-fbcon-to-use-the-primary-display-driver-fix-2.patch
fbdev-fbcon-console-unregistration-from-unregister_framebuffer-fix.patch
cfs-scheduler-vs-detach-schedh-from-mmh.patch
cfs-scheduler-warning-fixes.patch
kernel-doc-fix-leading-dot-in-man-mode-output-fix.patch
coredump-masking-reimplementation-of-dumpable-using-two-flags-fix.patch
audit-rework-execve-audit-fix.patch
containersv10-basic-container-framework-fix.patch
containersv10-example-cpu-accounting-subsystem-fix.patch
containersv10-add-tasks-file-interface-fix.patch
containersv10-add-fork-exit-hooks-fix.patch
containersv10-add-container_clone-interface-fix.patch
containersv10-add-procfs-interface-fix.patch
containersv10-share-css_group-arrays-between-tasks-with-same-container-memberships-fix.patch
containersv10-simple-debug-info-subsystem-fix.patch
containersv10-simple-debug-info-subsystem-fix-2.patch
lockstat-core-infrastructure-fix.patch
lockstat-core-infrastructure-fix-fix.patch
reiser4.patch
reiser4-fix.patch
nick-broke-reiser4-too.patch
check_dirty_inode_list.patch
w1-build-fix.patch
17 years, 7 months