openwrtv3/target/linux/generic/pending-4.14/140-jffs2-use-.rename2-and-add-RENAME_WHITEOUT-support.patch
Stijn Tintel e52f3e9b13 kernel: bump 4.14 to 4.14.48
Remove upstreamed patches:
generic/pending/101-clocksource-mips-gic-timer-fix-clocksource-counter-w.patch
generic/pending/103-MIPS-c-r4k-fix-data-corruption-related-to-cache-coherence.patch
generic/pending/182-net-qmi_wwan-add-BroadMobi-BM806U-2020-2033.patch
lantiq/0025-MIPS-lantiq-gphy-Remove-reboot-remove-reset-asserts.patch
Update patches that no longer apply:
generic/pending/811-pci_disable_usb_common_quirks.patch
ath79/0009-MIPS-ath79-add-lots-of-missing-registers.patch

Fixes CVE-2018-6412.

Compile-tested: octeon, x86/64.
Runtime-tested: octeon, x86/64.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
2018-06-05 22:54:00 +03:00

62 lines
1.7 KiB
Diff

From: Felix Fietkau <nbd@nbd.name>
Subject: jffs2: use .rename2 and add RENAME_WHITEOUT support
It is required for renames on overlayfs
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -752,6 +752,24 @@ static int jffs2_mknod (struct inode *di
return ret;
}
+static int jffs2_whiteout (struct inode *old_dir, struct dentry *old_dentry)
+{
+ struct dentry *wh;
+ int err;
+
+ wh = d_alloc(old_dentry->d_parent, &old_dentry->d_name);
+ if (!wh)
+ return -ENOMEM;
+
+ err = jffs2_mknod(old_dir, wh, S_IFCHR | WHITEOUT_MODE,
+ WHITEOUT_DEV);
+ if (err)
+ return err;
+
+ d_rehash(wh);
+ return 0;
+}
+
static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
struct inode *new_dir_i, struct dentry *new_dentry,
unsigned int flags)
@@ -762,7 +780,7 @@ static int jffs2_rename (struct inode *o
uint8_t type;
uint32_t now;
- if (flags & ~RENAME_NOREPLACE)
+ if (flags & ~(RENAME_NOREPLACE|RENAME_WHITEOUT))
return -EINVAL;
/* The VFS will check for us and prevent trying to rename a
@@ -828,9 +846,14 @@ static int jffs2_rename (struct inode *o
if (d_is_dir(old_dentry) && !victim_f)
inc_nlink(new_dir_i);
- /* Unlink the original */
- ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
- old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
+ if (flags & RENAME_WHITEOUT)
+ /* Replace with whiteout */
+ ret = jffs2_whiteout(old_dir_i, old_dentry);
+ else
+ /* Unlink the original */
+ ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
+ old_dentry->d_name.name,
+ old_dentry->d_name.len, NULL, now);
/* We don't touch inode->i_nlink */