diff options
Diffstat (limited to 'sys-fs/erofs-utils/files/erofs-utils-1.6-CVE-2023-33552.patch')
| -rw-r--r-- | sys-fs/erofs-utils/files/erofs-utils-1.6-CVE-2023-33552.patch | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/sys-fs/erofs-utils/files/erofs-utils-1.6-CVE-2023-33552.patch b/sys-fs/erofs-utils/files/erofs-utils-1.6-CVE-2023-33552.patch new file mode 100644 index 000000000000..c53a9b8044fe --- /dev/null +++ b/sys-fs/erofs-utils/files/erofs-utils-1.6-CVE-2023-33552.patch @@ -0,0 +1,117 @@ +https://git.kernel.org/xiang/erofs-utils/c/2145dff03dd3f3f74bcda3b52160fbad37f7fcfe +From: Gao Xiang <hsiangkao@linux.alibaba.com> +Date: Fri, 2 Jun 2023 11:05:19 +0800 +Subject: erofs-utils: fsck: don't allocate/read too large extents + +Since some crafted EROFS filesystem images could have insane large +extents, which causes unexpected bahaviors when extracting data. + +Fix it by extracting large extents with a buffer of a reasonable +maximum size limit and reading multiple times instead. + +Note that only `--extract` option is impacted. + +CVE: CVE-2023-33552 +Closes: https://nvd.nist.gov/vuln/detail/CVE-2023-33552 +Reported-by: Chaoming Yang <lometsj@live.com> +Fixes: 412c8f908132 ("erofs-utils: fsck: add --extract=X support to extract to path X") +Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com> +Link: https://lore.kernel.org/r/20230602030519.117071-1-hsiangkao@linux.alibaba.com +--- a/fsck/main.c ++++ b/fsck/main.c +@@ -392,6 +392,8 @@ static int erofs_verify_inode_data(struct erofs_inode *inode, int outfd) + } + + while (pos < inode->i_size) { ++ unsigned int alloc_rawsize; ++ + map.m_la = pos; + if (compressed) + ret = z_erofs_map_blocks_iter(inode, &map, +@@ -420,10 +422,28 @@ static int erofs_verify_inode_data(struct erofs_inode *inode, int outfd) + if (!(map.m_flags & EROFS_MAP_MAPPED) || !fsckcfg.check_decomp) + continue; + +- if (map.m_plen > raw_size) { +- raw_size = map.m_plen; +- raw = realloc(raw, raw_size); +- BUG_ON(!raw); ++ if (map.m_plen > Z_EROFS_PCLUSTER_MAX_SIZE) { ++ if (compressed) { ++ erofs_err("invalid pcluster size %" PRIu64 " @ offset %" PRIu64 " of nid %" PRIu64, ++ map.m_plen, map.m_la, ++ inode->nid | 0ULL); ++ ret = -EFSCORRUPTED; ++ goto out; ++ } ++ alloc_rawsize = Z_EROFS_PCLUSTER_MAX_SIZE; ++ } else { ++ alloc_rawsize = map.m_plen; ++ } ++ ++ if (alloc_rawsize > raw_size) { ++ char *newraw = realloc(raw, alloc_rawsize); ++ ++ if (!newraw) { ++ ret = -ENOMEM; ++ goto out; ++ } ++ raw = newraw; ++ raw_size = alloc_rawsize; + } + + if (compressed) { +@@ -434,18 +454,27 @@ static int erofs_verify_inode_data(struct erofs_inode *inode, int outfd) + } + ret = z_erofs_read_one_data(inode, &map, raw, buffer, + 0, map.m_llen, false); ++ if (ret) ++ goto out; ++ ++ if (outfd >= 0 && write(outfd, buffer, map.m_llen) < 0) ++ goto fail_eio; + } else { +- ret = erofs_read_one_data(&map, raw, 0, map.m_plen); +- } +- if (ret) +- goto out; ++ u64 p = 0; + +- if (outfd >= 0 && write(outfd, compressed ? buffer : raw, +- map.m_llen) < 0) { +- erofs_err("I/O error occurred when verifying data chunk @ nid %llu", +- inode->nid | 0ULL); +- ret = -EIO; +- goto out; ++ do { ++ u64 count = min_t(u64, alloc_rawsize, ++ map.m_llen); ++ ++ ret = erofs_read_one_data(&map, raw, p, count); ++ if (ret) ++ goto out; ++ ++ if (outfd >= 0 && write(outfd, raw, count) < 0) ++ goto fail_eio; ++ map.m_llen -= count; ++ p += count; ++ } while (map.m_llen); + } + } + +@@ -460,6 +489,12 @@ out: + if (buffer) + free(buffer); + return ret < 0 ? ret : 0; ++ ++fail_eio: ++ erofs_err("I/O error occurred when verifying data chunk @ nid %llu", ++ inode->nid | 0ULL); ++ ret = -EIO; ++ goto out; + } + + static inline int erofs_extract_dir(struct erofs_inode *inode) +-- +cgit + |