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ca97f7e541
Use unsigned type in call to macro mint_t(). This avoids confusing the compiler about possible negative values that would cause the value in _len_ to wrap around. Fixes the following -Wstringop-warnings seen when building ARM architecture with allyesconfig (GCC 13): fs/udf/directory.c: In function 'udf_copy_fi': include/linux/fortify-string.h:57:33: warning: '__builtin_memcpy' specified bound between 2147483648 and 4294967295 exceeds maximum object size 2147483647 [-Wstringop-overflow=] 57 | #define __underlying_memcpy __builtin_memcpy | ^ include/linux/fortify-string.h:648:9: note: in expansion of macro '__underlying_memcpy' 648 | __underlying_##op(p, q, __fortify_size); \ | ^~~~~~~~~~~~~ include/linux/fortify-string.h:693:26: note: in expansion of macro '__fortify_memcpy_chk' 693 | #define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \ | ^~~~~~~~~~~~~~~~~~~~ fs/udf/directory.c:99:9: note: in expansion of macro 'memcpy' 99 | memcpy(&iter->fi, iter->bh[0]->b_data + off, len); | ^~~~~~ include/linux/fortify-string.h:57:33: warning: '__builtin_memcpy' specified bound between 2147483648 and 4294967295 exceeds maximum object size 2147483647 [-Wstringop-overflow=] 57 | #define __underlying_memcpy __builtin_memcpy | ^ include/linux/fortify-string.h:648:9: note: in expansion of macro '__underlying_memcpy' 648 | __underlying_##op(p, q, __fortify_size); \ | ^~~~~~~~~~~~~ include/linux/fortify-string.h:693:26: note: in expansion of macro '__fortify_memcpy_chk' 693 | #define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \ | ^~~~~~~~~~~~~~~~~~~~ fs/udf/directory.c:99:9: note: in expansion of macro 'memcpy' 99 | memcpy(&iter->fi, iter->bh[0]->b_data + off, len); | ^~~~~~ AR fs/udf/built-in.a This helps with the ongoing efforts to globally enable -Wstringop-overflow. Link: https://github.com/KSPP/linux/issues/329 Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Jan Kara <jack@suse.cz> Message-Id: <ZK7wKS0NgZPfqrZu@work>
534 lines
14 KiB
C
534 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* directory.c
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*
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* PURPOSE
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* Directory related functions
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*
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*/
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#include "udfdecl.h"
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#include "udf_i.h"
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/bio.h>
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#include <linux/crc-itu-t.h>
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#include <linux/iversion.h>
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static int udf_verify_fi(struct udf_fileident_iter *iter)
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{
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unsigned int len;
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if (iter->fi.descTag.tagIdent != cpu_to_le16(TAG_IDENT_FID)) {
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udf_err(iter->dir->i_sb,
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"directory (ino %lu) has entry at pos %llu with incorrect tag %x\n",
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iter->dir->i_ino, (unsigned long long)iter->pos,
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le16_to_cpu(iter->fi.descTag.tagIdent));
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return -EFSCORRUPTED;
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}
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len = udf_dir_entry_len(&iter->fi);
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if (le16_to_cpu(iter->fi.lengthOfImpUse) & 3) {
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udf_err(iter->dir->i_sb,
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"directory (ino %lu) has entry at pos %llu with unaligned length of impUse field\n",
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iter->dir->i_ino, (unsigned long long)iter->pos);
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return -EFSCORRUPTED;
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}
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/*
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* This is in fact allowed by the spec due to long impUse field but
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* we don't support it. If there is real media with this large impUse
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* field, support can be added.
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*/
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if (len > 1 << iter->dir->i_blkbits) {
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udf_err(iter->dir->i_sb,
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"directory (ino %lu) has too big (%u) entry at pos %llu\n",
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iter->dir->i_ino, len, (unsigned long long)iter->pos);
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return -EFSCORRUPTED;
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}
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if (iter->pos + len > iter->dir->i_size) {
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udf_err(iter->dir->i_sb,
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"directory (ino %lu) has entry past directory size at pos %llu\n",
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iter->dir->i_ino, (unsigned long long)iter->pos);
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return -EFSCORRUPTED;
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}
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if (udf_dir_entry_len(&iter->fi) !=
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sizeof(struct tag) + le16_to_cpu(iter->fi.descTag.descCRCLength)) {
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udf_err(iter->dir->i_sb,
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"directory (ino %lu) has entry where CRC length (%u) does not match entry length (%u)\n",
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iter->dir->i_ino,
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(unsigned)le16_to_cpu(iter->fi.descTag.descCRCLength),
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(unsigned)(udf_dir_entry_len(&iter->fi) -
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sizeof(struct tag)));
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return -EFSCORRUPTED;
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}
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return 0;
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}
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static int udf_copy_fi(struct udf_fileident_iter *iter)
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{
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struct udf_inode_info *iinfo = UDF_I(iter->dir);
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u32 blksize = 1 << iter->dir->i_blkbits;
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u32 off, len, nameoff;
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int err;
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/* Skip copying when we are at EOF */
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if (iter->pos >= iter->dir->i_size) {
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iter->name = NULL;
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return 0;
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}
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if (iter->dir->i_size < iter->pos + sizeof(struct fileIdentDesc)) {
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udf_err(iter->dir->i_sb,
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"directory (ino %lu) has entry straddling EOF\n",
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iter->dir->i_ino);
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return -EFSCORRUPTED;
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}
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if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
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memcpy(&iter->fi, iinfo->i_data + iinfo->i_lenEAttr + iter->pos,
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sizeof(struct fileIdentDesc));
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err = udf_verify_fi(iter);
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if (err < 0)
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return err;
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iter->name = iinfo->i_data + iinfo->i_lenEAttr + iter->pos +
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sizeof(struct fileIdentDesc) +
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le16_to_cpu(iter->fi.lengthOfImpUse);
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return 0;
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}
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off = iter->pos & (blksize - 1);
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len = min_t(u32, sizeof(struct fileIdentDesc), blksize - off);
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memcpy(&iter->fi, iter->bh[0]->b_data + off, len);
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if (len < sizeof(struct fileIdentDesc))
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memcpy((char *)(&iter->fi) + len, iter->bh[1]->b_data,
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sizeof(struct fileIdentDesc) - len);
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err = udf_verify_fi(iter);
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if (err < 0)
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return err;
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/* Handle directory entry name */
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nameoff = off + sizeof(struct fileIdentDesc) +
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le16_to_cpu(iter->fi.lengthOfImpUse);
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if (off + udf_dir_entry_len(&iter->fi) <= blksize) {
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iter->name = iter->bh[0]->b_data + nameoff;
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} else if (nameoff >= blksize) {
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iter->name = iter->bh[1]->b_data + (nameoff - blksize);
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} else {
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iter->name = iter->namebuf;
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len = blksize - nameoff;
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memcpy(iter->name, iter->bh[0]->b_data + nameoff, len);
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memcpy(iter->name + len, iter->bh[1]->b_data,
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iter->fi.lengthFileIdent - len);
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}
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return 0;
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}
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/* Readahead 8k once we are at 8k boundary */
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static void udf_readahead_dir(struct udf_fileident_iter *iter)
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{
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unsigned int ralen = 16 >> (iter->dir->i_blkbits - 9);
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struct buffer_head *tmp, *bha[16];
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int i, num;
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udf_pblk_t blk;
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if (iter->loffset & (ralen - 1))
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return;
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if (iter->loffset + ralen > (iter->elen >> iter->dir->i_blkbits))
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ralen = (iter->elen >> iter->dir->i_blkbits) - iter->loffset;
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num = 0;
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for (i = 0; i < ralen; i++) {
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blk = udf_get_lb_pblock(iter->dir->i_sb, &iter->eloc,
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iter->loffset + i);
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tmp = sb_getblk(iter->dir->i_sb, blk);
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if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
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bha[num++] = tmp;
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else
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brelse(tmp);
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}
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if (num) {
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bh_readahead_batch(num, bha, REQ_RAHEAD);
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for (i = 0; i < num; i++)
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brelse(bha[i]);
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}
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}
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static struct buffer_head *udf_fiiter_bread_blk(struct udf_fileident_iter *iter)
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{
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udf_pblk_t blk;
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udf_readahead_dir(iter);
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blk = udf_get_lb_pblock(iter->dir->i_sb, &iter->eloc, iter->loffset);
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return sb_bread(iter->dir->i_sb, blk);
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}
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/*
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* Updates loffset to point to next directory block; eloc, elen & epos are
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* updated if we need to traverse to the next extent as well.
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*/
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static int udf_fiiter_advance_blk(struct udf_fileident_iter *iter)
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{
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iter->loffset++;
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if (iter->loffset < DIV_ROUND_UP(iter->elen, 1<<iter->dir->i_blkbits))
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return 0;
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iter->loffset = 0;
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if (udf_next_aext(iter->dir, &iter->epos, &iter->eloc, &iter->elen, 1)
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!= (EXT_RECORDED_ALLOCATED >> 30)) {
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if (iter->pos == iter->dir->i_size) {
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iter->elen = 0;
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return 0;
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}
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udf_err(iter->dir->i_sb,
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"extent after position %llu not allocated in directory (ino %lu)\n",
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(unsigned long long)iter->pos, iter->dir->i_ino);
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return -EFSCORRUPTED;
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}
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return 0;
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}
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static int udf_fiiter_load_bhs(struct udf_fileident_iter *iter)
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{
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int blksize = 1 << iter->dir->i_blkbits;
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int off = iter->pos & (blksize - 1);
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int err;
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struct fileIdentDesc *fi;
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/* Is there any further extent we can map from? */
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if (!iter->bh[0] && iter->elen) {
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iter->bh[0] = udf_fiiter_bread_blk(iter);
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if (!iter->bh[0]) {
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err = -ENOMEM;
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goto out_brelse;
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}
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if (!buffer_uptodate(iter->bh[0])) {
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err = -EIO;
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goto out_brelse;
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}
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}
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/* There's no next block so we are done */
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if (iter->pos >= iter->dir->i_size)
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return 0;
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/* Need to fetch next block as well? */
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if (off + sizeof(struct fileIdentDesc) > blksize)
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goto fetch_next;
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fi = (struct fileIdentDesc *)(iter->bh[0]->b_data + off);
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/* Need to fetch next block to get name? */
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if (off + udf_dir_entry_len(fi) > blksize) {
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fetch_next:
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err = udf_fiiter_advance_blk(iter);
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if (err)
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goto out_brelse;
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iter->bh[1] = udf_fiiter_bread_blk(iter);
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if (!iter->bh[1]) {
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err = -ENOMEM;
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goto out_brelse;
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}
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if (!buffer_uptodate(iter->bh[1])) {
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err = -EIO;
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goto out_brelse;
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}
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}
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return 0;
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out_brelse:
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brelse(iter->bh[0]);
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brelse(iter->bh[1]);
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iter->bh[0] = iter->bh[1] = NULL;
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return err;
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}
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int udf_fiiter_init(struct udf_fileident_iter *iter, struct inode *dir,
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loff_t pos)
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{
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struct udf_inode_info *iinfo = UDF_I(dir);
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int err = 0;
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iter->dir = dir;
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iter->bh[0] = iter->bh[1] = NULL;
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iter->pos = pos;
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iter->elen = 0;
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iter->epos.bh = NULL;
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iter->name = NULL;
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/*
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* When directory is verified, we don't expect directory iteration to
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* fail and it can be difficult to undo without corrupting filesystem.
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* So just do not allow memory allocation failures here.
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*/
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iter->namebuf = kmalloc(UDF_NAME_LEN_CS0, GFP_KERNEL | __GFP_NOFAIL);
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if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
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err = udf_copy_fi(iter);
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goto out;
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}
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if (inode_bmap(dir, iter->pos >> dir->i_blkbits, &iter->epos,
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&iter->eloc, &iter->elen, &iter->loffset) !=
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(EXT_RECORDED_ALLOCATED >> 30)) {
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if (pos == dir->i_size)
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return 0;
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udf_err(dir->i_sb,
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"position %llu not allocated in directory (ino %lu)\n",
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(unsigned long long)pos, dir->i_ino);
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err = -EFSCORRUPTED;
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goto out;
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}
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err = udf_fiiter_load_bhs(iter);
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if (err < 0)
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goto out;
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err = udf_copy_fi(iter);
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out:
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if (err < 0)
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udf_fiiter_release(iter);
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return err;
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}
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int udf_fiiter_advance(struct udf_fileident_iter *iter)
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{
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unsigned int oldoff, len;
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int blksize = 1 << iter->dir->i_blkbits;
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int err;
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oldoff = iter->pos & (blksize - 1);
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len = udf_dir_entry_len(&iter->fi);
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iter->pos += len;
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if (UDF_I(iter->dir)->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
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if (oldoff + len >= blksize) {
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brelse(iter->bh[0]);
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iter->bh[0] = NULL;
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/* Next block already loaded? */
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if (iter->bh[1]) {
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iter->bh[0] = iter->bh[1];
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iter->bh[1] = NULL;
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} else {
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err = udf_fiiter_advance_blk(iter);
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if (err < 0)
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return err;
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}
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}
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err = udf_fiiter_load_bhs(iter);
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if (err < 0)
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return err;
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}
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return udf_copy_fi(iter);
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}
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void udf_fiiter_release(struct udf_fileident_iter *iter)
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{
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iter->dir = NULL;
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brelse(iter->bh[0]);
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brelse(iter->bh[1]);
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iter->bh[0] = iter->bh[1] = NULL;
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kfree(iter->namebuf);
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iter->namebuf = NULL;
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}
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static void udf_copy_to_bufs(void *buf1, int len1, void *buf2, int len2,
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int off, void *src, int len)
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{
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int copy;
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if (off >= len1) {
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off -= len1;
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} else {
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copy = min(off + len, len1) - off;
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memcpy(buf1 + off, src, copy);
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src += copy;
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len -= copy;
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off = 0;
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}
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if (len > 0) {
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if (WARN_ON_ONCE(off + len > len2 || !buf2))
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return;
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memcpy(buf2 + off, src, len);
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}
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}
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static uint16_t udf_crc_fi_bufs(void *buf1, int len1, void *buf2, int len2,
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int off, int len)
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{
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int copy;
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uint16_t crc = 0;
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if (off >= len1) {
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off -= len1;
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} else {
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copy = min(off + len, len1) - off;
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crc = crc_itu_t(crc, buf1 + off, copy);
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len -= copy;
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off = 0;
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}
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if (len > 0) {
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if (WARN_ON_ONCE(off + len > len2 || !buf2))
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return 0;
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crc = crc_itu_t(crc, buf2 + off, len);
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}
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return crc;
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}
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static void udf_copy_fi_to_bufs(char *buf1, int len1, char *buf2, int len2,
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int off, struct fileIdentDesc *fi,
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uint8_t *impuse, uint8_t *name)
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{
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uint16_t crc;
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int fioff = off;
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int crcoff = off + sizeof(struct tag);
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unsigned int crclen = udf_dir_entry_len(fi) - sizeof(struct tag);
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char zeros[UDF_NAME_PAD] = {};
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int endoff = off + udf_dir_entry_len(fi);
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udf_copy_to_bufs(buf1, len1, buf2, len2, off, fi,
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sizeof(struct fileIdentDesc));
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off += sizeof(struct fileIdentDesc);
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if (impuse)
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udf_copy_to_bufs(buf1, len1, buf2, len2, off, impuse,
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le16_to_cpu(fi->lengthOfImpUse));
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off += le16_to_cpu(fi->lengthOfImpUse);
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if (name) {
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udf_copy_to_bufs(buf1, len1, buf2, len2, off, name,
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fi->lengthFileIdent);
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off += fi->lengthFileIdent;
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udf_copy_to_bufs(buf1, len1, buf2, len2, off, zeros,
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endoff - off);
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}
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crc = udf_crc_fi_bufs(buf1, len1, buf2, len2, crcoff, crclen);
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fi->descTag.descCRC = cpu_to_le16(crc);
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fi->descTag.descCRCLength = cpu_to_le16(crclen);
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fi->descTag.tagChecksum = udf_tag_checksum(&fi->descTag);
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udf_copy_to_bufs(buf1, len1, buf2, len2, fioff, fi, sizeof(struct tag));
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}
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void udf_fiiter_write_fi(struct udf_fileident_iter *iter, uint8_t *impuse)
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{
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struct udf_inode_info *iinfo = UDF_I(iter->dir);
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void *buf1, *buf2 = NULL;
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int len1, len2 = 0, off;
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int blksize = 1 << iter->dir->i_blkbits;
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off = iter->pos & (blksize - 1);
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if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
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buf1 = iinfo->i_data + iinfo->i_lenEAttr;
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len1 = iter->dir->i_size;
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} else {
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buf1 = iter->bh[0]->b_data;
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len1 = blksize;
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if (iter->bh[1]) {
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buf2 = iter->bh[1]->b_data;
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len2 = blksize;
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}
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}
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udf_copy_fi_to_bufs(buf1, len1, buf2, len2, off, &iter->fi, impuse,
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iter->name == iter->namebuf ? iter->name : NULL);
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if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
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mark_inode_dirty(iter->dir);
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} else {
|
|
mark_buffer_dirty_inode(iter->bh[0], iter->dir);
|
|
if (iter->bh[1])
|
|
mark_buffer_dirty_inode(iter->bh[1], iter->dir);
|
|
}
|
|
inode_inc_iversion(iter->dir);
|
|
}
|
|
|
|
void udf_fiiter_update_elen(struct udf_fileident_iter *iter, uint32_t new_elen)
|
|
{
|
|
struct udf_inode_info *iinfo = UDF_I(iter->dir);
|
|
int diff = new_elen - iter->elen;
|
|
|
|
/* Skip update when we already went past the last extent */
|
|
if (!iter->elen)
|
|
return;
|
|
iter->elen = new_elen;
|
|
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
|
|
iter->epos.offset -= sizeof(struct short_ad);
|
|
else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
|
|
iter->epos.offset -= sizeof(struct long_ad);
|
|
udf_write_aext(iter->dir, &iter->epos, &iter->eloc, iter->elen, 1);
|
|
iinfo->i_lenExtents += diff;
|
|
mark_inode_dirty(iter->dir);
|
|
}
|
|
|
|
/* Append new block to directory. @iter is expected to point at EOF */
|
|
int udf_fiiter_append_blk(struct udf_fileident_iter *iter)
|
|
{
|
|
struct udf_inode_info *iinfo = UDF_I(iter->dir);
|
|
int blksize = 1 << iter->dir->i_blkbits;
|
|
struct buffer_head *bh;
|
|
sector_t block;
|
|
uint32_t old_elen = iter->elen;
|
|
int err;
|
|
|
|
if (WARN_ON_ONCE(iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB))
|
|
return -EINVAL;
|
|
|
|
/* Round up last extent in the file */
|
|
udf_fiiter_update_elen(iter, ALIGN(iter->elen, blksize));
|
|
|
|
/* Allocate new block and refresh mapping information */
|
|
block = iinfo->i_lenExtents >> iter->dir->i_blkbits;
|
|
bh = udf_bread(iter->dir, block, 1, &err);
|
|
if (!bh) {
|
|
udf_fiiter_update_elen(iter, old_elen);
|
|
return err;
|
|
}
|
|
if (inode_bmap(iter->dir, block, &iter->epos, &iter->eloc, &iter->elen,
|
|
&iter->loffset) != (EXT_RECORDED_ALLOCATED >> 30)) {
|
|
udf_err(iter->dir->i_sb,
|
|
"block %llu not allocated in directory (ino %lu)\n",
|
|
(unsigned long long)block, iter->dir->i_ino);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
if (!(iter->pos & (blksize - 1))) {
|
|
brelse(iter->bh[0]);
|
|
iter->bh[0] = bh;
|
|
} else {
|
|
iter->bh[1] = bh;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
struct short_ad *udf_get_fileshortad(uint8_t *ptr, int maxoffset, uint32_t *offset,
|
|
int inc)
|
|
{
|
|
struct short_ad *sa;
|
|
|
|
if ((!ptr) || (!offset)) {
|
|
pr_err("%s: invalidparms\n", __func__);
|
|
return NULL;
|
|
}
|
|
|
|
if ((*offset + sizeof(struct short_ad)) > maxoffset)
|
|
return NULL;
|
|
else {
|
|
sa = (struct short_ad *)ptr;
|
|
if (sa->extLength == 0)
|
|
return NULL;
|
|
}
|
|
|
|
if (inc)
|
|
*offset += sizeof(struct short_ad);
|
|
return sa;
|
|
}
|
|
|
|
struct long_ad *udf_get_filelongad(uint8_t *ptr, int maxoffset, uint32_t *offset, int inc)
|
|
{
|
|
struct long_ad *la;
|
|
|
|
if ((!ptr) || (!offset)) {
|
|
pr_err("%s: invalidparms\n", __func__);
|
|
return NULL;
|
|
}
|
|
|
|
if ((*offset + sizeof(struct long_ad)) > maxoffset)
|
|
return NULL;
|
|
else {
|
|
la = (struct long_ad *)ptr;
|
|
if (la->extLength == 0)
|
|
return NULL;
|
|
}
|
|
|
|
if (inc)
|
|
*offset += sizeof(struct long_ad);
|
|
return la;
|
|
}
|