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audit: issue CWD record to accompany LSM_AUDIT_DATA_* records

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The LSM_AUDIT_DATA_* records for PATH, FILE, IOCTL_OP, DENTRY and INODE
are incomplete without the task context of the AUDIT Current Working
Directory record.  Add it.

This record addition can't use audit_dummy_context to determine whether
or not to store the record information since the LSM_AUDIT_DATA_*
records are initiated by various LSMs independent of any audit rules.
context->in_syscall is used to determine if it was called in user
context like audit_getname.

Please see the upstream issue
https://github.com/linux-audit/audit-kernel/issues/96

Adapted from Vladis Dronov's v2 patch.

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Richard Guy Briggs
2020-07-03 12:56:19 -04:00
committed by Paul Moore
parent 68df2ed544
commit d7481b24b8
3 changed files with 28 additions and 3 deletions
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17
kernel/auditsc.c
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@@ -1891,6 +1891,20 @@ __audit_reusename(const __user char *uptr)
return NULL;
}
inline void _audit_getcwd(struct audit_context *context)
{
if (!context->pwd.dentry)
get_fs_pwd(current->fs, &context->pwd);
}
void __audit_getcwd(void)
{
struct audit_context *context = audit_context();
if (context->in_syscall)
_audit_getcwd(context);
}
/**
* __audit_getname - add a name to the list
* @name: name to add
@@ -1915,8 +1929,7 @@ void __audit_getname(struct filename *name)
name->aname = n;
name->refcnt++;
if (!context->pwd.dentry)
get_fs_pwd(current->fs, &context->pwd);
_audit_getcwd(context);
}
static inline int audit_copy_fcaps(struct audit_names *name,