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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2007-07-19 01:48:15 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-19 10:04:45 -0700 |
| commit | bdf4c48af20a3b0f01671799ace345e3d49576da (patch) | |
| tree | 7c3b903d2de1cba6e212ad6f347bc8742b08035a /fs/exec.c | |
| parent | b111757c50ee30dad162192df6168e270a90c252 (diff) | |
| download | kernel-crypto-bdf4c48af20a3b0f01671799ace345e3d49576da.tar.gz kernel-crypto-bdf4c48af20a3b0f01671799ace345e3d49576da.tar.xz kernel-crypto-bdf4c48af20a3b0f01671799ace345e3d49576da.zip | |
audit: rework execve audit
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@chello.nl>
Signed-off-by: Ollie Wild <aaw@google.com>
Cc: <linux-audit@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/exec.c')
| -rw-r--r-- | fs/exec.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/exec.c b/fs/exec.c index f20561ff452..2e3f7950c18 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1154,6 +1154,7 @@ int do_execve(char * filename, { struct linux_binprm *bprm; struct file *file; + unsigned long env_p; int retval; int i; @@ -1208,9 +1209,11 @@ int do_execve(char * filename, if (retval < 0) goto out; + env_p = bprm->p; retval = copy_strings(bprm->argc, argv, bprm); if (retval < 0) goto out; + bprm->argv_len = env_p - bprm->p; retval = search_binary_handler(bprm,regs); if (retval >= 0) { |