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-rw-r--r--fs/ubifs/lpt.c342
1 files changed, 251 insertions, 91 deletions
diff --git a/fs/ubifs/lpt.c b/fs/ubifs/lpt.c
index 9a517109da0f..dde0aa3287f4 100644
--- a/fs/ubifs/lpt.c
+++ b/fs/ubifs/lpt.c
@@ -1,21 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
*
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 51
- * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
* Authors: Adrian Hunter
* Artem Bityutskiy (Битюцкий Артём)
*/
@@ -225,21 +213,22 @@ static int calc_dflt_lpt_geom(struct ubifs_info *c, int *main_lebs,
/**
* pack_bits - pack bit fields end-to-end.
+ * @c: UBIFS file-system description object
* @addr: address at which to pack (passed and next address returned)
* @pos: bit position at which to pack (passed and next position returned)
* @val: value to pack
* @nrbits: number of bits of value to pack (1-32)
*/
-static void pack_bits(uint8_t **addr, int *pos, uint32_t val, int nrbits)
+static void pack_bits(const struct ubifs_info *c, uint8_t **addr, int *pos, uint32_t val, int nrbits)
{
uint8_t *p = *addr;
int b = *pos;
- ubifs_assert(nrbits > 0);
- ubifs_assert(nrbits <= 32);
- ubifs_assert(*pos >= 0);
- ubifs_assert(*pos < 8);
- ubifs_assert((val >> nrbits) == 0 || nrbits == 32);
+ ubifs_assert(c, nrbits > 0);
+ ubifs_assert(c, nrbits <= 32);
+ ubifs_assert(c, *pos >= 0);
+ ubifs_assert(c, *pos < 8);
+ ubifs_assert(c, (val >> nrbits) == 0 || nrbits == 32);
if (b) {
*p |= ((uint8_t)val) << b;
nrbits += b;
@@ -274,24 +263,25 @@ static void pack_bits(uint8_t **addr, int *pos, uint32_t val, int nrbits)
/**
* ubifs_unpack_bits - unpack bit fields.
+ * @c: UBIFS file-system description object
* @addr: address at which to unpack (passed and next address returned)
* @pos: bit position at which to unpack (passed and next position returned)
* @nrbits: number of bits of value to unpack (1-32)
*
* This functions returns the value unpacked.
*/
-uint32_t ubifs_unpack_bits(uint8_t **addr, int *pos, int nrbits)
+uint32_t ubifs_unpack_bits(const struct ubifs_info *c, uint8_t **addr, int *pos, int nrbits)
{
const int k = 32 - nrbits;
uint8_t *p = *addr;
int b = *pos;
- uint32_t uninitialized_var(val);
+ uint32_t val;
const int bytes = (nrbits + b + 7) >> 3;
- ubifs_assert(nrbits > 0);
- ubifs_assert(nrbits <= 32);
- ubifs_assert(*pos >= 0);
- ubifs_assert(*pos < 8);
+ ubifs_assert(c, nrbits > 0);
+ ubifs_assert(c, nrbits <= 32);
+ ubifs_assert(c, *pos >= 0);
+ ubifs_assert(c, *pos < 8);
if (b) {
switch (bytes) {
case 2:
@@ -337,7 +327,7 @@ uint32_t ubifs_unpack_bits(uint8_t **addr, int *pos, int nrbits)
p += nrbits >> 3;
*addr = p;
*pos = b;
- ubifs_assert((val >> nrbits) == 0 || nrbits - b == 32);
+ ubifs_assert(c, (val >> nrbits) == 0 || nrbits - b == 32);
return val;
}
@@ -354,24 +344,24 @@ void ubifs_pack_pnode(struct ubifs_info *c, void *buf,
int i, pos = 0;
uint16_t crc;
- pack_bits(&addr, &pos, UBIFS_LPT_PNODE, UBIFS_LPT_TYPE_BITS);
+ pack_bits(c, &addr, &pos, UBIFS_LPT_PNODE, UBIFS_LPT_TYPE_BITS);
if (c->big_lpt)
- pack_bits(&addr, &pos, pnode->num, c->pcnt_bits);
+ pack_bits(c, &addr, &pos, pnode->num, c->pcnt_bits);
for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
- pack_bits(&addr, &pos, pnode->lprops[i].free >> 3,
+ pack_bits(c, &addr, &pos, pnode->lprops[i].free >> 3,
c->space_bits);
- pack_bits(&addr, &pos, pnode->lprops[i].dirty >> 3,
+ pack_bits(c, &addr, &pos, pnode->lprops[i].dirty >> 3,
c->space_bits);
if (pnode->lprops[i].flags & LPROPS_INDEX)
- pack_bits(&addr, &pos, 1, 1);
+ pack_bits(c, &addr, &pos, 1, 1);
else
- pack_bits(&addr, &pos, 0, 1);
+ pack_bits(c, &addr, &pos, 0, 1);
}
crc = crc16(-1, buf + UBIFS_LPT_CRC_BYTES,
c->pnode_sz - UBIFS_LPT_CRC_BYTES);
addr = buf;
pos = 0;
- pack_bits(&addr, &pos, crc, UBIFS_LPT_CRC_BITS);
+ pack_bits(c, &addr, &pos, crc, UBIFS_LPT_CRC_BITS);
}
/**
@@ -387,23 +377,23 @@ void ubifs_pack_nnode(struct ubifs_info *c, void *buf,
int i, pos = 0;
uint16_t crc;
- pack_bits(&addr, &pos, UBIFS_LPT_NNODE, UBIFS_LPT_TYPE_BITS);
+ pack_bits(c, &addr, &pos, UBIFS_LPT_NNODE, UBIFS_LPT_TYPE_BITS);
if (c->big_lpt)
- pack_bits(&addr, &pos, nnode->num, c->pcnt_bits);
+ pack_bits(c, &addr, &pos, nnode->num, c->pcnt_bits);
for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
int lnum = nnode->nbranch[i].lnum;
if (lnum == 0)
lnum = c->lpt_last + 1;
- pack_bits(&addr, &pos, lnum - c->lpt_first, c->lpt_lnum_bits);
- pack_bits(&addr, &pos, nnode->nbranch[i].offs,
+ pack_bits(c, &addr, &pos, lnum - c->lpt_first, c->lpt_lnum_bits);
+ pack_bits(c, &addr, &pos, nnode->nbranch[i].offs,
c->lpt_offs_bits);
}
crc = crc16(-1, buf + UBIFS_LPT_CRC_BYTES,
c->nnode_sz - UBIFS_LPT_CRC_BYTES);
addr = buf;
pos = 0;
- pack_bits(&addr, &pos, crc, UBIFS_LPT_CRC_BITS);
+ pack_bits(c, &addr, &pos, crc, UBIFS_LPT_CRC_BITS);
}
/**
@@ -419,16 +409,16 @@ void ubifs_pack_ltab(struct ubifs_info *c, void *buf,
int i, pos = 0;
uint16_t crc;
- pack_bits(&addr, &pos, UBIFS_LPT_LTAB, UBIFS_LPT_TYPE_BITS);
+ pack_bits(c, &addr, &pos, UBIFS_LPT_LTAB, UBIFS_LPT_TYPE_BITS);
for (i = 0; i < c->lpt_lebs; i++) {
- pack_bits(&addr, &pos, ltab[i].free, c->lpt_spc_bits);
- pack_bits(&addr, &pos, ltab[i].dirty, c->lpt_spc_bits);
+ pack_bits(c, &addr, &pos, ltab[i].free, c->lpt_spc_bits);
+ pack_bits(c, &addr, &pos, ltab[i].dirty, c->lpt_spc_bits);
}
crc = crc16(-1, buf + UBIFS_LPT_CRC_BYTES,
c->ltab_sz - UBIFS_LPT_CRC_BYTES);
addr = buf;
pos = 0;
- pack_bits(&addr, &pos, crc, UBIFS_LPT_CRC_BITS);
+ pack_bits(c, &addr, &pos, crc, UBIFS_LPT_CRC_BITS);
}
/**
@@ -443,14 +433,14 @@ void ubifs_pack_lsave(struct ubifs_info *c, void *buf, int *lsave)
int i, pos = 0;
uint16_t crc;
- pack_bits(&addr, &pos, UBIFS_LPT_LSAVE, UBIFS_LPT_TYPE_BITS);
+ pack_bits(c, &addr, &pos, UBIFS_LPT_LSAVE, UBIFS_LPT_TYPE_BITS);
for (i = 0; i < c->lsave_cnt; i++)
- pack_bits(&addr, &pos, lsave[i], c->lnum_bits);
+ pack_bits(c, &addr, &pos, lsave[i], c->lnum_bits);
crc = crc16(-1, buf + UBIFS_LPT_CRC_BYTES,
c->lsave_sz - UBIFS_LPT_CRC_BYTES);
addr = buf;
pos = 0;
- pack_bits(&addr, &pos, crc, UBIFS_LPT_CRC_BITS);
+ pack_bits(c, &addr, &pos, crc, UBIFS_LPT_CRC_BITS);
}
/**
@@ -465,7 +455,7 @@ void ubifs_add_lpt_dirt(struct ubifs_info *c, int lnum, int dirty)
return;
dbg_lp("LEB %d add %d to %d",
lnum, dirty, c->ltab[lnum - c->lpt_first].dirty);
- ubifs_assert(lnum >= c->lpt_first && lnum <= c->lpt_last);
+ ubifs_assert(c, lnum >= c->lpt_first && lnum <= c->lpt_last);
c->ltab[lnum - c->lpt_first].dirty += dirty;
}
@@ -481,7 +471,7 @@ static void set_ltab(struct ubifs_info *c, int lnum, int free, int dirty)
dbg_lp("LEB %d free %d dirty %d to %d %d",
lnum, c->ltab[lnum - c->lpt_first].free,
c->ltab[lnum - c->lpt_first].dirty, free, dirty);
- ubifs_assert(lnum >= c->lpt_first && lnum <= c->lpt_last);
+ ubifs_assert(c, lnum >= c->lpt_first && lnum <= c->lpt_last);
c->ltab[lnum - c->lpt_first].free = free;
c->ltab[lnum - c->lpt_first].dirty = dirty;
}
@@ -602,11 +592,12 @@ static int calc_pnode_num_from_parent(const struct ubifs_info *c,
* @lpt_first: LEB number of first LPT LEB
* @lpt_lebs: number of LEBs for LPT is passed and returned here
* @big_lpt: use big LPT model is passed and returned here
+ * @hash: hash of the LPT is returned here
*
* This function returns %0 on success and a negative error code on failure.
*/
int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
- int *lpt_lebs, int *big_lpt)
+ int *lpt_lebs, int *big_lpt, u8 *hash)
{
int lnum, err = 0, node_sz, iopos, i, j, cnt, len, alen, row;
int blnum, boffs, bsz, bcnt;
@@ -615,6 +606,7 @@ int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
void *buf = NULL, *p;
struct ubifs_lpt_lprops *ltab = NULL;
int *lsave = NULL;
+ struct shash_desc *desc;
err = calc_dflt_lpt_geom(c, main_lebs, big_lpt);
if (err)
@@ -628,17 +620,22 @@ int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
/* Needed by 'ubifs_pack_lsave()' */
c->main_first = c->leb_cnt - *main_lebs;
- lsave = kmalloc(sizeof(int) * c->lsave_cnt, GFP_KERNEL);
+ desc = ubifs_hash_get_desc(c);
+ if (IS_ERR(desc))
+ return PTR_ERR(desc);
+
+ lsave = kmalloc_array(c->lsave_cnt, sizeof(int), GFP_KERNEL);
pnode = kzalloc(sizeof(struct ubifs_pnode), GFP_KERNEL);
nnode = kzalloc(sizeof(struct ubifs_nnode), GFP_KERNEL);
buf = vmalloc(c->leb_size);
- ltab = vmalloc(sizeof(struct ubifs_lpt_lprops) * c->lpt_lebs);
+ ltab = vmalloc_array(c->lpt_lebs,
+ sizeof(struct ubifs_lpt_lprops));
if (!pnode || !nnode || !buf || !ltab || !lsave) {
err = -ENOMEM;
goto out;
}
- ubifs_assert(!c->ltab);
+ ubifs_assert(c, !c->ltab);
c->ltab = ltab; /* Needed by set_ltab */
/* Initialize LPT's own lprops */
@@ -674,6 +671,10 @@ int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
/* Add first pnode */
ubifs_pack_pnode(c, p, pnode);
+ err = ubifs_shash_update(c, desc, p, c->pnode_sz);
+ if (err)
+ goto out;
+
p += c->pnode_sz;
len = c->pnode_sz;
pnode->num += 1;
@@ -708,6 +709,10 @@ int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
len = 0;
}
ubifs_pack_pnode(c, p, pnode);
+ err = ubifs_shash_update(c, desc, p, c->pnode_sz);
+ if (err)
+ goto out;
+
p += c->pnode_sz;
len += c->pnode_sz;
/*
@@ -827,6 +832,10 @@ int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
if (err)
goto out;
+ err = ubifs_shash_final(c, desc, hash);
+ if (err)
+ goto out;
+
c->nhead_lnum = lnum;
c->nhead_offs = ALIGN(len, c->min_io_size);
@@ -842,7 +851,7 @@ int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
dbg_lp("lsave_sz %d", c->lsave_sz);
dbg_lp("lsave_cnt %d", c->lsave_cnt);
dbg_lp("lpt_hght %d", c->lpt_hght);
- dbg_lp("big_lpt %d", c->big_lpt);
+ dbg_lp("big_lpt %u", c->big_lpt);
dbg_lp("LPT root is at %d:%d", c->lpt_lnum, c->lpt_offs);
dbg_lp("LPT head is at %d:%d", c->nhead_lnum, c->nhead_offs);
dbg_lp("LPT ltab is at %d:%d", c->ltab_lnum, c->ltab_offs);
@@ -850,6 +859,7 @@ int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
dbg_lp("LPT lsave is at %d:%d", c->lsave_lnum, c->lsave_offs);
out:
c->ltab = NULL;
+ kfree(desc);
kfree(lsave);
vfree(ltab);
vfree(buf);
@@ -917,7 +927,7 @@ static int check_lpt_crc(const struct ubifs_info *c, void *buf, int len)
uint8_t *addr = buf;
uint16_t crc, calc_crc;
- crc = ubifs_unpack_bits(&addr, &pos, UBIFS_LPT_CRC_BITS);
+ crc = ubifs_unpack_bits(c, &addr, &pos, UBIFS_LPT_CRC_BITS);
calc_crc = crc16(-1, buf + UBIFS_LPT_CRC_BYTES,
len - UBIFS_LPT_CRC_BYTES);
if (crc != calc_crc) {
@@ -943,7 +953,7 @@ static int check_lpt_type(const struct ubifs_info *c, uint8_t **addr,
{
int node_type;
- node_type = ubifs_unpack_bits(addr, pos, UBIFS_LPT_TYPE_BITS);
+ node_type = ubifs_unpack_bits(c, addr, pos, UBIFS_LPT_TYPE_BITS);
if (node_type != type) {
ubifs_err(c, "invalid type (%d) in LPT node type %d",
node_type, type);
@@ -971,16 +981,16 @@ static int unpack_pnode(const struct ubifs_info *c, void *buf,
if (err)
return err;
if (c->big_lpt)
- pnode->num = ubifs_unpack_bits(&addr, &pos, c->pcnt_bits);
+ pnode->num = ubifs_unpack_bits(c, &addr, &pos, c->pcnt_bits);
for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
struct ubifs_lprops * const lprops = &pnode->lprops[i];
- lprops->free = ubifs_unpack_bits(&addr, &pos, c->space_bits);
+ lprops->free = ubifs_unpack_bits(c, &addr, &pos, c->space_bits);
lprops->free <<= 3;
- lprops->dirty = ubifs_unpack_bits(&addr, &pos, c->space_bits);
+ lprops->dirty = ubifs_unpack_bits(c, &addr, &pos, c->space_bits);
lprops->dirty <<= 3;
- if (ubifs_unpack_bits(&addr, &pos, 1))
+ if (ubifs_unpack_bits(c, &addr, &pos, 1))
lprops->flags = LPROPS_INDEX;
else
lprops->flags = 0;
@@ -1008,16 +1018,16 @@ int ubifs_unpack_nnode(const struct ubifs_info *c, void *buf,
if (err)
return err;
if (c->big_lpt)
- nnode->num = ubifs_unpack_bits(&addr, &pos, c->pcnt_bits);
+ nnode->num = ubifs_unpack_bits(c, &addr, &pos, c->pcnt_bits);
for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
int lnum;
- lnum = ubifs_unpack_bits(&addr, &pos, c->lpt_lnum_bits) +
+ lnum = ubifs_unpack_bits(c, &addr, &pos, c->lpt_lnum_bits) +
c->lpt_first;
if (lnum == c->lpt_last + 1)
lnum = 0;
nnode->nbranch[i].lnum = lnum;
- nnode->nbranch[i].offs = ubifs_unpack_bits(&addr, &pos,
+ nnode->nbranch[i].offs = ubifs_unpack_bits(c, &addr, &pos,
c->lpt_offs_bits);
}
err = check_lpt_crc(c, buf, c->nnode_sz);
@@ -1040,8 +1050,8 @@ static int unpack_ltab(const struct ubifs_info *c, void *buf)
if (err)
return err;
for (i = 0; i < c->lpt_lebs; i++) {
- int free = ubifs_unpack_bits(&addr, &pos, c->lpt_spc_bits);
- int dirty = ubifs_unpack_bits(&addr, &pos, c->lpt_spc_bits);
+ int free = ubifs_unpack_bits(c, &addr, &pos, c->lpt_spc_bits);
+ int dirty = ubifs_unpack_bits(c, &addr, &pos, c->lpt_spc_bits);
if (free < 0 || free > c->leb_size || dirty < 0 ||
dirty > c->leb_size || free + dirty > c->leb_size)
@@ -1072,7 +1082,7 @@ static int unpack_lsave(const struct ubifs_info *c, void *buf)
if (err)
return err;
for (i = 0; i < c->lsave_cnt; i++) {
- int lnum = ubifs_unpack_bits(&addr, &pos, c->lnum_bits);
+ int lnum = ubifs_unpack_bits(c, &addr, &pos, c->lnum_bits);
if (lnum < c->main_first || lnum >= c->leb_cnt)
return -EINVAL;
@@ -1436,26 +1446,25 @@ struct ubifs_pnode *ubifs_get_pnode(struct ubifs_info *c,
}
/**
- * ubifs_lpt_lookup - lookup LEB properties in the LPT.
+ * ubifs_pnode_lookup - lookup a pnode in the LPT.
* @c: UBIFS file-system description object
- * @lnum: LEB number to lookup
+ * @i: pnode number (0 to (main_lebs - 1) / UBIFS_LPT_FANOUT)
*
- * This function returns a pointer to the LEB properties on success or a
- * negative error code on failure.
+ * This function returns a pointer to the pnode on success or a negative
+ * error code on failure.
*/
-struct ubifs_lprops *ubifs_lpt_lookup(struct ubifs_info *c, int lnum)
+struct ubifs_pnode *ubifs_pnode_lookup(struct ubifs_info *c, int i)
{
- int err, i, h, iip, shft;
+ int err, h, iip, shft;
struct ubifs_nnode *nnode;
- struct ubifs_pnode *pnode;
if (!c->nroot) {
err = ubifs_read_nnode(c, NULL, 0);
if (err)
return ERR_PTR(err);
}
+ i <<= UBIFS_LPT_FANOUT_SHIFT;
nnode = c->nroot;
- i = lnum - c->main_first;
shft = c->lpt_hght * UBIFS_LPT_FANOUT_SHIFT;
for (h = 1; h < c->lpt_hght; h++) {
iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1));
@@ -1465,7 +1474,24 @@ struct ubifs_lprops *ubifs_lpt_lookup(struct ubifs_info *c, int lnum)
return ERR_CAST(nnode);
}
iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1));
- pnode = ubifs_get_pnode(c, nnode, iip);
+ return ubifs_get_pnode(c, nnode, iip);
+}
+
+/**
+ * ubifs_lpt_lookup - lookup LEB properties in the LPT.
+ * @c: UBIFS file-system description object
+ * @lnum: LEB number to lookup
+ *
+ * This function returns a pointer to the LEB properties on success or a
+ * negative error code on failure.
+ */
+struct ubifs_lprops *ubifs_lpt_lookup(struct ubifs_info *c, int lnum)
+{
+ int i, iip;
+ struct ubifs_pnode *pnode;
+
+ i = lnum - c->main_first;
+ pnode = ubifs_pnode_lookup(c, i >> UBIFS_LPT_FANOUT_SHIFT);
if (IS_ERR(pnode))
return ERR_CAST(pnode);
iip = (i & (UBIFS_LPT_FANOUT - 1));
@@ -1514,7 +1540,7 @@ static struct ubifs_nnode *dirty_cow_nnode(struct ubifs_info *c,
branch->cnode->parent = n;
}
- ubifs_assert(!test_bit(OBSOLETE_CNODE, &nnode->flags));
+ ubifs_assert(c, !test_bit(OBSOLETE_CNODE, &nnode->flags));
__set_bit(OBSOLETE_CNODE, &nnode->flags);
c->dirty_nn_cnt += 1;
@@ -1557,7 +1583,7 @@ static struct ubifs_pnode *dirty_cow_pnode(struct ubifs_info *c,
__clear_bit(COW_CNODE, &p->flags);
replace_cats(c, pnode, p);
- ubifs_assert(!test_bit(OBSOLETE_CNODE, &pnode->flags));
+ ubifs_assert(c, !test_bit(OBSOLETE_CNODE, &pnode->flags));
__set_bit(OBSOLETE_CNODE, &pnode->flags);
c->dirty_pn_cnt += 1;
@@ -1612,11 +1638,136 @@ struct ubifs_lprops *ubifs_lpt_lookup_dirty(struct ubifs_info *c, int lnum)
dbg_lp("LEB %d, free %d, dirty %d, flags %d", lnum,
pnode->lprops[iip].free, pnode->lprops[iip].dirty,
pnode->lprops[iip].flags);
- ubifs_assert(test_bit(DIRTY_CNODE, &pnode->flags));
+ ubifs_assert(c, test_bit(DIRTY_CNODE, &pnode->flags));
return &pnode->lprops[iip];
}
/**
+ * ubifs_lpt_calc_hash - Calculate hash of the LPT pnodes
+ * @c: UBIFS file-system description object
+ * @hash: the returned hash of the LPT pnodes
+ *
+ * This function iterates over the LPT pnodes and creates a hash over them.
+ * Returns 0 for success or a negative error code otherwise.
+ */
+int ubifs_lpt_calc_hash(struct ubifs_info *c, u8 *hash)
+{
+ struct ubifs_nnode *nnode, *nn;
+ struct ubifs_cnode *cnode;
+ struct shash_desc *desc;
+ int iip = 0, i;
+ int bufsiz = max_t(int, c->nnode_sz, c->pnode_sz);
+ void *buf;
+ int err;
+
+ if (!ubifs_authenticated(c))
+ return 0;
+
+ if (!c->nroot) {
+ err = ubifs_read_nnode(c, NULL, 0);
+ if (err)
+ return err;
+ }
+
+ desc = ubifs_hash_get_desc(c);
+ if (IS_ERR(desc))
+ return PTR_ERR(desc);
+
+ buf = kmalloc(bufsiz, GFP_NOFS);
+ if (!buf) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ cnode = (struct ubifs_cnode *)c->nroot;
+
+ while (cnode) {
+ nnode = cnode->parent;
+ nn = (struct ubifs_nnode *)cnode;
+ if (cnode->level > 1) {
+ while (iip < UBIFS_LPT_FANOUT) {
+ if (nn->nbranch[iip].lnum == 0) {
+ /* Go right */
+ iip++;
+ continue;
+ }
+
+ nnode = ubifs_get_nnode(c, nn, iip);
+ if (IS_ERR(nnode)) {
+ err = PTR_ERR(nnode);
+ goto out;
+ }
+
+ /* Go down */
+ iip = 0;
+ cnode = (struct ubifs_cnode *)nnode;
+ break;
+ }
+ if (iip < UBIFS_LPT_FANOUT)
+ continue;
+ } else {
+ struct ubifs_pnode *pnode;
+
+ for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
+ if (nn->nbranch[i].lnum == 0)
+ continue;
+ pnode = ubifs_get_pnode(c, nn, i);
+ if (IS_ERR(pnode)) {
+ err = PTR_ERR(pnode);
+ goto out;
+ }
+
+ ubifs_pack_pnode(c, buf, pnode);
+ err = ubifs_shash_update(c, desc, buf,
+ c->pnode_sz);
+ if (err)
+ goto out;
+ }
+ }
+ /* Go up and to the right */
+ iip = cnode->iip + 1;
+ cnode = (struct ubifs_cnode *)nnode;
+ }
+
+ err = ubifs_shash_final(c, desc, hash);
+out:
+ kfree(desc);
+ kfree(buf);
+
+ return err;
+}
+
+/**
+ * lpt_check_hash - check the hash of the LPT.
+ * @c: UBIFS file-system description object
+ *
+ * This function calculates a hash over all pnodes in the LPT and compares it with
+ * the hash stored in the master node. Returns %0 on success and a negative error
+ * code on failure.
+ */
+static int lpt_check_hash(struct ubifs_info *c)
+{
+ int err;
+ u8 hash[UBIFS_HASH_ARR_SZ];
+
+ if (!ubifs_authenticated(c))
+ return 0;
+
+ err = ubifs_lpt_calc_hash(c, hash);
+ if (err)
+ return err;
+
+ if (ubifs_check_hash(c, c->mst_node->hash_lpt, hash)) {
+ err = -EPERM;
+ ubifs_err(c, "Failed to authenticate LPT");
+ } else {
+ err = 0;
+ }
+
+ return err;
+}
+
+/**
* lpt_init_rd - initialize the LPT for reading.
* @c: UBIFS file-system description object
*
@@ -1626,7 +1777,8 @@ static int lpt_init_rd(struct ubifs_info *c)
{
int err, i;
- c->ltab = vmalloc(sizeof(struct ubifs_lpt_lprops) * c->lpt_lebs);
+ c->ltab = vmalloc_array(c->lpt_lebs,
+ sizeof(struct ubifs_lpt_lprops));
if (!c->ltab)
return -ENOMEM;
@@ -1636,15 +1788,17 @@ static int lpt_init_rd(struct ubifs_info *c)
return -ENOMEM;
for (i = 0; i < LPROPS_HEAP_CNT; i++) {
- c->lpt_heap[i].arr = kmalloc(sizeof(void *) * LPT_HEAP_SZ,
- GFP_KERNEL);
+ c->lpt_heap[i].arr = kmalloc_array(LPT_HEAP_SZ,
+ sizeof(void *),
+ GFP_KERNEL);
if (!c->lpt_heap[i].arr)
return -ENOMEM;
c->lpt_heap[i].cnt = 0;
c->lpt_heap[i].max_cnt = LPT_HEAP_SZ;
}
- c->dirty_idx.arr = kmalloc(sizeof(void *) * LPT_HEAP_SZ, GFP_KERNEL);
+ c->dirty_idx.arr = kmalloc_array(LPT_HEAP_SZ, sizeof(void *),
+ GFP_KERNEL);
if (!c->dirty_idx.arr)
return -ENOMEM;
c->dirty_idx.cnt = 0;
@@ -1654,6 +1808,10 @@ static int lpt_init_rd(struct ubifs_info *c)
if (err)
return err;
+ err = lpt_check_hash(c);
+ if (err)
+ return err;
+
dbg_lp("space_bits %d", c->space_bits);
dbg_lp("lpt_lnum_bits %d", c->lpt_lnum_bits);
dbg_lp("lpt_offs_bits %d", c->lpt_offs_bits);
@@ -1666,7 +1824,7 @@ static int lpt_init_rd(struct ubifs_info *c)
dbg_lp("lsave_sz %d", c->lsave_sz);
dbg_lp("lsave_cnt %d", c->lsave_cnt);
dbg_lp("lpt_hght %d", c->lpt_hght);
- dbg_lp("big_lpt %d", c->big_lpt);
+ dbg_lp("big_lpt %u", c->big_lpt);
dbg_lp("LPT root is at %d:%d", c->lpt_lnum, c->lpt_offs);
dbg_lp("LPT head is at %d:%d", c->nhead_lnum, c->nhead_offs);
dbg_lp("LPT ltab is at %d:%d", c->ltab_lnum, c->ltab_offs);
@@ -1688,7 +1846,8 @@ static int lpt_init_wr(struct ubifs_info *c)
{
int err, i;
- c->ltab_cmt = vmalloc(sizeof(struct ubifs_lpt_lprops) * c->lpt_lebs);
+ c->ltab_cmt = vmalloc_array(c->lpt_lebs,
+ sizeof(struct ubifs_lpt_lprops));
if (!c->ltab_cmt)
return -ENOMEM;
@@ -1697,7 +1856,7 @@ static int lpt_init_wr(struct ubifs_info *c)
return -ENOMEM;
if (c->big_lpt) {
- c->lsave = kmalloc(sizeof(int) * c->lsave_cnt, GFP_NOFS);
+ c->lsave = kmalloc_array(c->lsave_cnt, sizeof(int), GFP_NOFS);
if (!c->lsave)
return -ENOMEM;
err = read_lsave(c);
@@ -1759,6 +1918,7 @@ out_err:
* @pnode: where to keep a pnode
* @cnode: where to keep a cnode
* @in_tree: is the node in the tree in memory
+ * @ptr: union of node pointers
* @ptr.nnode: pointer to the nnode (if it is an nnode) which may be here or in
* the tree
* @ptr.pnode: ditto for pnode
@@ -1884,9 +2044,9 @@ static struct ubifs_pnode *scan_get_pnode(struct ubifs_info *c,
lprops->flags = ubifs_categorize_lprops(c, lprops);
}
} else {
- ubifs_assert(branch->lnum >= c->lpt_first &&
+ ubifs_assert(c, branch->lnum >= c->lpt_first &&
branch->lnum <= c->lpt_last);
- ubifs_assert(branch->offs >= 0 && branch->offs < c->leb_size);
+ ubifs_assert(c, branch->offs >= 0 && branch->offs < c->leb_size);
err = ubifs_leb_read(c, branch->lnum, buf, branch->offs,
c->pnode_sz, 1);
if (err)
@@ -1930,8 +2090,8 @@ int ubifs_lpt_scan_nolock(struct ubifs_info *c, int start_lnum, int end_lnum,
start_lnum = c->main_first;
}
- ubifs_assert(start_lnum >= c->main_first && start_lnum < c->leb_cnt);
- ubifs_assert(end_lnum >= c->main_first && end_lnum < c->leb_cnt);
+ ubifs_assert(c, start_lnum >= c->main_first && start_lnum < c->leb_cnt);
+ ubifs_assert(c, end_lnum >= c->main_first && end_lnum < c->leb_cnt);
if (!c->nroot) {
err = ubifs_read_nnode(c, NULL, 0);
@@ -1939,8 +2099,8 @@ int ubifs_lpt_scan_nolock(struct ubifs_info *c, int start_lnum, int end_lnum,
return err;
}
- path = kmalloc(sizeof(struct lpt_scan_node) * (c->lpt_hght + 1),
- GFP_NOFS);
+ path = kmalloc_array(c->lpt_hght + 1, sizeof(struct lpt_scan_node),
+ GFP_NOFS);
if (!path)
return -ENOMEM;
@@ -2050,7 +2210,7 @@ again:
iip = pnode->iip;
while (1) {
h -= 1;
- ubifs_assert(h >= 0);
+ ubifs_assert(c, h >= 0);
nnode = path[h].ptr.nnode;
if (iip + 1 < UBIFS_LPT_FANOUT)
break;
@@ -2229,7 +2389,7 @@ int dbg_check_lpt_nodes(struct ubifs_info *c, struct ubifs_cnode *cnode,
return 0;
while (cnode) {
- ubifs_assert(row >= 0);
+ ubifs_assert(c, row >= 0);
nnode = cnode->parent;
if (cnode->level) {
/* cnode is a nnode */
generated by cgit (git 2.34.1) at 2025-12-25 17:11:00 +0000