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audit: call audit_bprm() only once to add AUDIT_EXECVE information

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Move the audit_bprm() call from search_binary_handler() to exec_binprm().  This
allows us to get rid of the mm member of struct audit_aux_data_execve since
bprm->mm will equal current->mm.

This also mitigates the issue that ->argc could be modified by the
load_binary() call in search_binary_handler().

audit_bprm() was being called to add an AUDIT_EXECVE record to the audit
context every time search_binary_handler() was recursively called.  Only one
reference is necessary.

Reported-by: Oleg Nesterov <onestero@redhat.com>
Cc: Eric Paris <eparis@redhat.com>
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Eric Paris <eparis@redhat.com>
---
This patch is against 3.11, but was developed on Oleg's post-3.11 patches that
introduce exec_binprm().
This commit is contained in:
Richard Guy Briggs
2013-11-05 11:15:03 -05:00
committed by Eric Paris
parent d9cfea91e9
commit 9410d228a4
4 changed files with 4 additions and 15 deletions
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kernel/audit.h
-1
View File
@@ -199,7 +199,6 @@ struct audit_context {
} mmap;
struct {
int argc;
struct mm_struct *mm;
} execve;
};
int fds[2];
kernel/auditsc.c
-4
View File
@@ -1145,9 +1145,6 @@ static void audit_log_execve_info(struct audit_context *context,
const char __user *p;
char *buf;
if (context->execve.mm != current->mm)
return; /* execve failed, no additional info */
p = (const char __user *)current->mm->arg_start;
audit_log_format(*ab, "argc=%d", context->execve.argc);
@@ -2144,7 +2141,6 @@ void __audit_bprm(struct linux_binprm *bprm)
context->type = AUDIT_EXECVE;
context->execve.argc = bprm->argc;
context->execve.mm = bprm->mm;
}