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Revert "audit,io_uring: io_uring openat triggers audit reference count underflow"

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This reverts commit f7e65c03d5 which is
commit 03adc61eda upstream.

It breaks the android ABI and if this is needed in the future, can be
brought back in an abi-safe way.

Bug: 161946584
Change-Id: I15820e234045dc6486c8176128dc7d3205db9216
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Greg Kroah-Hartman
2023-11-06 14:50:51 +00:00
parent ddf96fa712
commit 08d790dfee
3 changed files with 9 additions and 10 deletions
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9
fs/namei.c
View File

@@ -187,7 +187,7 @@ getname_flags(const char __user *filename, int flags, int *empty)
}
}
atomic_set(&result->refcnt, 1);
result->refcnt = 1;
/* The empty path is special. */
if (unlikely(!len)) {
if (empty)
@@ -248,7 +248,7 @@ getname_kernel(const char * filename)
memcpy((char *)result->name, filename, len);
result->uptr = NULL;
result->aname = NULL;
atomic_set(&result->refcnt, 1);
result->refcnt = 1;
audit_getname(result);
return result;
@@ -259,10 +259,9 @@ void putname(struct filename *name)
if (IS_ERR(name))
return;
if (WARN_ON_ONCE(!atomic_read(&name->refcnt)))
return;
BUG_ON(name->refcnt <= 0);
if (!atomic_dec_and_test(&name->refcnt))
if (--name->refcnt > 0)
return;
if (name->name != name->iname) {

2
include/linux/fs.h
View File

@@ -2745,7 +2745,7 @@ struct audit_names;
struct filename {
const char *name; /* pointer to actual string */
const __user char *uptr; /* original userland pointer */
atomic_t refcnt;
int refcnt;
struct audit_names *aname;
const char iname[];
};

8
kernel/auditsc.c
View File

@@ -2208,7 +2208,7 @@ __audit_reusename(const __user char *uptr)
if (!n->name)
continue;
if (n->name->uptr == uptr) {
atomic_inc(&n->name->refcnt);
n->name->refcnt++;
return n->name;
}
}
@@ -2237,7 +2237,7 @@ void __audit_getname(struct filename *name)
n->name = name;
n->name_len = AUDIT_NAME_FULL;
name->aname = n;
atomic_inc(&name->refcnt);
name->refcnt++;
}
static inline int audit_copy_fcaps(struct audit_names *name,
@@ -2369,7 +2369,7 @@ out_alloc:
return;
if (name) {
n->name = name;
atomic_inc(&name->refcnt);
name->refcnt++;
}
out:
@@ -2496,7 +2496,7 @@ void __audit_inode_child(struct inode *parent,
if (found_parent) {
found_child->name = found_parent->name;
found_child->name_len = AUDIT_NAME_FULL;
atomic_inc(&found_child->name->refcnt);
found_child->name->refcnt++;
}
}