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From 8aef6015a03242a7d13467d23ad52b5427bf5247 Mon Sep 17 00:00:00 2001
From: Yue Hu <huyue2@coolpad.com>
Date: Wed, 11 Jan 2023 09:49:26 +0800
Subject: [PATCH] erofs-utils: lib: export parts of erofs_pread()
Export parts of erofs_pread() to avoid duplicated code in
erofs_verify_inode_data(). Let's make two helpers for this.
Signed-off-by: Yue Hu <huyue2@coolpad.com>
Link: https://lore.kernel.org/r/ff560da9c798b2ca1f1a663a000501486d865487.1673401718.git.huyue2@coolpad.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
CVE: CVE-2023-33552
Upstream-Status: Backport [https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs-utils.git/commit/?id=4c0fb15a5d85378debe9d10d96cd643d167300ca]
Signed-off-by: Changqing Li <changqing.li@windriver.com>
---
include/erofs/internal.h | 5 ++
lib/data.c | 108 ++++++++++++++++++++++++---------------
2 files changed, 71 insertions(+), 42 deletions(-)
diff --git a/include/erofs/internal.h b/include/erofs/internal.h
index d3b2986..28d0e68 100644
--- a/include/erofs/internal.h
+++ b/include/erofs/internal.h
@@ -335,6 +335,11 @@ int erofs_pread(struct erofs_inode *inode, char *buf,
int erofs_map_blocks(struct erofs_inode *inode,
struct erofs_map_blocks *map, int flags);
int erofs_map_dev(struct erofs_sb_info *sbi, struct erofs_map_dev *map);
+int erofs_read_one_data(struct erofs_map_blocks *map, char *buffer, u64 offset,
+ size_t len);
+int z_erofs_read_one_data(struct erofs_inode *inode,
+ struct erofs_map_blocks *map, char *raw, char *buffer,
+ erofs_off_t skip, erofs_off_t length, bool trimmed);
static inline int erofs_get_occupied_size(const struct erofs_inode *inode,
erofs_off_t *size)
diff --git a/lib/data.c b/lib/data.c
index 6bc554d..2a7fdd5 100644
--- a/lib/data.c
+++ b/lib/data.c
@@ -158,19 +158,38 @@ int erofs_map_dev(struct erofs_sb_info *sbi, struct erofs_map_dev *map)
return 0;
}
+int erofs_read_one_data(struct erofs_map_blocks *map, char *buffer, u64 offset,
+ size_t len)
+{
+ struct erofs_map_dev mdev;
+ int ret;
+
+ mdev = (struct erofs_map_dev) {
+ .m_deviceid = map->m_deviceid,
+ .m_pa = map->m_pa,
+ };
+ ret = erofs_map_dev(&sbi, &mdev);
+ if (ret)
+ return ret;
+
+ ret = dev_read(mdev.m_deviceid, buffer, mdev.m_pa + offset, len);
+ if (ret < 0)
+ return -EIO;
+ return 0;
+}
+
static int erofs_read_raw_data(struct erofs_inode *inode, char *buffer,
erofs_off_t size, erofs_off_t offset)
{
struct erofs_map_blocks map = {
.index = UINT_MAX,
};
- struct erofs_map_dev mdev;
int ret;
erofs_off_t ptr = offset;
while (ptr < offset + size) {
char *const estart = buffer + ptr - offset;
- erofs_off_t eend;
+ erofs_off_t eend, moff = 0;
map.m_la = ptr;
ret = erofs_map_blocks(inode, &map, 0);
@@ -179,14 +198,6 @@ static int erofs_read_raw_data(struct erofs_inode *inode, char *buffer,
DBG_BUGON(map.m_plen != map.m_llen);
- mdev = (struct erofs_map_dev) {
- .m_deviceid = map.m_deviceid,
- .m_pa = map.m_pa,
- };
- ret = erofs_map_dev(&sbi, &mdev);
- if (ret)
- return ret;
-
/* trim extent */
eend = min(offset + size, map.m_la + map.m_llen);
DBG_BUGON(ptr < map.m_la);
@@ -204,19 +215,54 @@ static int erofs_read_raw_data(struct erofs_inode *inode, char *buffer,
}
if (ptr > map.m_la) {
- mdev.m_pa += ptr - map.m_la;
+ moff = ptr - map.m_la;
map.m_la = ptr;
}
- ret = dev_read(mdev.m_deviceid, estart, mdev.m_pa,
- eend - map.m_la);
- if (ret < 0)
- return -EIO;
+ ret = erofs_read_one_data(&map, estart, moff, eend - map.m_la);
+ if (ret)
+ return ret;
ptr = eend;
}
return 0;
}
+int z_erofs_read_one_data(struct erofs_inode *inode,
+ struct erofs_map_blocks *map, char *raw, char *buffer,
+ erofs_off_t skip, erofs_off_t length, bool trimmed)
+{
+ struct erofs_map_dev mdev;
+ int ret = 0;
+
+ /* no device id here, thus it will always succeed */
+ mdev = (struct erofs_map_dev) {
+ .m_pa = map->m_pa,
+ };
+ ret = erofs_map_dev(&sbi, &mdev);
+ if (ret) {
+ DBG_BUGON(1);
+ return ret;
+ }
+
+ ret = dev_read(mdev.m_deviceid, raw, mdev.m_pa, map->m_plen);
+ if (ret < 0)
+ return ret;
+
+ ret = z_erofs_decompress(&(struct z_erofs_decompress_req) {
+ .in = raw,
+ .out = buffer,
+ .decodedskip = skip,
+ .inputsize = map->m_plen,
+ .decodedlength = length,
+ .alg = map->m_algorithmformat,
+ .partial_decoding = trimmed ? true :
+ !(map->m_flags & EROFS_MAP_FULL_MAPPED)
+ });
+ if (ret < 0)
+ return ret;
+ return 0;
+}
+
static int z_erofs_read_data(struct erofs_inode *inode, char *buffer,
erofs_off_t size, erofs_off_t offset)
{
@@ -224,8 +270,7 @@ static int z_erofs_read_data(struct erofs_inode *inode, char *buffer,
struct erofs_map_blocks map = {
.index = UINT_MAX,
};
- struct erofs_map_dev mdev;
- bool partial;
+ bool trimmed;
unsigned int bufsize = 0;
char *raw = NULL;
int ret = 0;
@@ -238,27 +283,17 @@ static int z_erofs_read_data(struct erofs_inode *inode, char *buffer,
if (ret)
break;
- /* no device id here, thus it will always succeed */
- mdev = (struct erofs_map_dev) {
- .m_pa = map.m_pa,
- };
- ret = erofs_map_dev(&sbi, &mdev);
- if (ret) {
- DBG_BUGON(1);
- break;
- }
-
/*
* trim to the needed size if the returned extent is quite
* larger than requested, and set up partial flag as well.
*/
if (end < map.m_la + map.m_llen) {
length = end - map.m_la;
- partial = true;
+ trimmed = true;
} else {
DBG_BUGON(end != map.m_la + map.m_llen);
length = map.m_llen;
- partial = !(map.m_flags & EROFS_MAP_FULL_MAPPED);
+ trimmed = false;
}
if (map.m_la < offset) {
@@ -283,19 +318,8 @@ static int z_erofs_read_data(struct erofs_inode *inode, char *buffer,
break;
}
}
- ret = dev_read(mdev.m_deviceid, raw, mdev.m_pa, map.m_plen);
- if (ret < 0)
- break;
-
- ret = z_erofs_decompress(&(struct z_erofs_decompress_req) {
- .in = raw,
- .out = buffer + end - offset,
- .decodedskip = skip,
- .inputsize = map.m_plen,
- .decodedlength = length,
- .alg = map.m_algorithmformat,
- .partial_decoding = partial
- });
+ ret = z_erofs_read_one_data(inode, &map, raw,
+ buffer + end - offset, skip, length, trimmed);
if (ret < 0)
break;
}
--
2.25.1
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