[PATCH 7.0 41/76] dcache: Limit the minimal number of bucket to two

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

7.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zhihao Cheng <chengzhihao1@huawei.com>

commit f08fe8891c3eeb63b73f9f1f6d97aa629c821579 upstream.

There is an OOB read problem on dentry_hashtable when user sets
'dhash_entries=1':
  BUG: unable to handle page fault for address: ffff888b30b774b0
  #PF: supervisor read access in kernel mode
  #PF: error_code(0x0000) - not-present page
  Oops: Oops: 0000 [#1] SMP PTI
  RIP: 0010:__d_lookup+0x56/0x120
   Call Trace:
    d_lookup.cold+0x16/0x5d
    lookup_dcache+0x27/0xf0
    lookup_one_qstr_excl+0x2a/0x180
    start_dirop+0x55/0xa0
    simple_start_creating+0x8d/0xa0
    debugfs_start_creating+0x8c/0x180
    debugfs_create_dir+0x1d/0x1c0
    pinctrl_init+0x6d/0x140
    do_one_initcall+0x6d/0x3d0
    kernel_init_freeable+0x39f/0x460
    kernel_init+0x2a/0x260

There will be only one bucket in dentry_hashtable when dhash_entries is
set as one, and d_hash_shift is calculated as 32 by dcache_init(). Then,
following process will access more than one buckets(which memory region
is not allocated) in dentry_hashtable:
 d_lookup
  b = d_hash(hash)
    dentry_hashtable + ((u32)hashlen >> d_hash_shift)
    // The C standard defines the behavior of right shift amounts
    // exceeding the bit width of the operand as undefined. The
    // result of '(u32)hashlen >> d_hash_shift' becomes 'hashlen',
    // so 'b' will point to an unallocated memory region.
  hlist_bl_for_each_entry_rcu(b)
   hlist_bl_first_rcu(head)
    h->first  // read OOB!

Fix it by limiting the minimal number of dentry_hashtable bucket to two,
so that 'd_hash_shift' won't exceeds the bit width of type u32.

Cc: stable@vger.kernel.org
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Link: https://patch.msgid.link/20260130034853.215819-1-chengzhihao1@huawei.com
Reviewed-by: Yang Erkun <yangerkun@huawei.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/dcache.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -3257,7 +3257,7 @@ static void __init dcache_init_early(voi
 					HASH_EARLY | HASH_ZERO,
 					&d_hash_shift,
 					NULL,
-					0,
+					2,
 					0);
 	d_hash_shift = 32 - d_hash_shift;
 
@@ -3289,7 +3289,7 @@ static void __init dcache_init(void)
 					HASH_ZERO,
 					&d_hash_shift,
 					NULL,
-					0,
+					2,
 					0);
 	d_hash_shift = 32 - d_hash_shift;