From 034dd340b08be1f2f0477ad16131d609f9dbd53c Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 30 Aug 2026 09:22:00 -0700 Subject: Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracing fixes from Steven Rostedt: - Fix error output of boot instance creation failure Currently if a boot instance creation fails, instead of printing out the name of the instance that failed, it prints "(null)". That is because it prints "cur_str" that had already been processed by strsep(). Print the saved name instead. While at it, print the error code of the failure. - Fix use-after-free for same named historgrams Histograms can be named so that they can be used in multiple events. But if the named histogram has a variable attached, the second event that uses the named histogram which duplicates it and needs to free the original after duplication leaves the old variable in place and still visible. If another histogram uses than variable, it will use the stale one which will try to reference the freed duplicate histogram and crash the kernel. Free the duplicate variables along with the duplicated histogram data. - Check return value of kthread_run() in event self test The events self tests uses a kthread for testing but does not check if it succeeded in creating a kthread. If the kthread creation were to fail, the code will still try to call kthread_stop() on the error returned. - Fix race between reading trace_pipe and updating subbuffer size If a user is reading the trace_pipe file at the same time they update the ring buffer sub-buffer size, can cause the trace_pipe read to read stale data. Add trace_access_lock() around updating the ring buffer sub-buffer size. - Fix eventfs_inode on failure path in creation of the events directory In the creation of the "events" directory, if after allocating the eventfs_inode a failure is detected, it calls cleanup_ei() which calls free_ei(). The free_ei() will test if eventfs_inode being freed has no children. It is a bug if it does. But on the failure case of the creation of the "events" directory, the children lists have not yet been initialized and the free will trigger a warning because list_empty() on an uninitialized list returns false. Move the initialization into init_ei() where it makes more sense and makes sure that a created eventfs_inode has its lists initialized upon creation. - Check return value of kthread_run() in ftrace direct sample code The sample code that shows how to use the ftrace direct calls does not test the return of kthread_run() to see if it succeeds. Return a failure if the kthread_run() doesn't succeed. - Clear user events state on fork in case of alloc failure On fork, the child gets a pointer to the parent's user events state. It makes a copy of it then updates the child's pointer to it. But if the allocation fails, the duplication function leaves the child with a pointer to its parent's descriptor. When the child cleans up its data, it will free the parent's descriptor while the parent is still using it. In the duplication function, set the child's user_event_mm to NULL before testing if the allocation succeeded, and when it exits it will not free the parent's descriptor. - Fix retry exhaustion in simple ring buffer reader swap simple_ring_buffer_swap_reader_page() starts with retry set to 8 and post-decrements it only after a failed link replacement. On the final attempt, a successful replacement leaves retry at zero, while a failed replacement leaves it at -1. But the check for success expects the retry value to be non-zero and exits with an error on zero. This is the opposite result. Fix it. - Fail nicely when the remote swap_reader_page() returns an error Currently, if the swap_reader_page() of a remote buffer fails, it triggers a WARN_ON_ONCE() and continues normally. Instead, have it exit with an error and a pr_warn() print instead of a full WARNING. * tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: ring-buffer: Stop remote reader update when page swap fails tracing: Fix retry exhaustion in simple ring buffer reader swap tracing/user_events: Clear copied tracing state before fork duplication samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify eventfs: Initialize ei->children and ei->list in init_ei() tracing: Fix use-after-free in trace_pipe read on sub-buffer order change tracing: Fix crash passing ERR_PTR to kthread_stop() tracing: Fix use-after-free with same-name named triggers tracing: Fix logged instance name on creation failure --- fs/squashfs/inode.c | 456 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 456 insertions(+) create mode 100644 fs/squashfs/inode.c (limited to 'fs/squashfs/inode.c') diff --git a/fs/squashfs/inode.c b/fs/squashfs/inode.c new file mode 100644 index 000000000..82b687414 --- /dev/null +++ b/fs/squashfs/inode.c @@ -0,0 +1,456 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Squashfs - a compressed read only filesystem for Linux + * + * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 + * Phillip Lougher + * + * inode.c + */ + +/* + * This file implements code to create and read inodes from disk. + * + * Inodes in Squashfs are identified by a 48-bit inode which encodes the + * location of the compressed metadata block containing the inode, and the byte + * offset into that block where the inode is placed (). + * + * To maximise compression there are different inodes for each file type + * (regular file, directory, device, etc.), the inode contents and length + * varying with the type. + * + * To further maximise compression, two types of regular file inode and + * directory inode are defined: inodes optimised for frequently occurring + * regular files and directories, and extended types where extra + * information has to be stored. + */ + +#include +#include +#include +#include + +#include "squashfs_fs.h" +#include "squashfs_fs_sb.h" +#include "squashfs_fs_i.h" +#include "squashfs.h" +#include "xattr.h" + +/* + * Initialise VFS inode with the base inode information common to all + * Squashfs inode types. Sqsh_ino contains the unswapped base inode + * off disk. + */ +static int squashfs_new_inode(struct super_block *sb, struct inode *inode, + struct squashfs_base_inode *sqsh_ino) +{ + uid_t i_uid; + gid_t i_gid; + int err; + + inode->i_ino = le32_to_cpu(sqsh_ino->inode_number); + if (inode->i_ino == 0) + return -EINVAL; + + err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->uid), &i_uid); + if (err) + return err; + + err = squashfs_get_id(sb, le16_to_cpu(sqsh_ino->guid), &i_gid); + if (err) + return err; + + i_uid_write(inode, i_uid); + i_gid_write(inode, i_gid); + inode_set_mtime(inode, le32_to_cpu(sqsh_ino->mtime), 0); + inode_set_atime(inode, inode_get_mtime_sec(inode), 0); + inode_set_ctime(inode, inode_get_mtime_sec(inode), 0); + inode->i_mode = le16_to_cpu(sqsh_ino->mode); + inode->i_size = 0; + + /* File type must not be set at this moment, for it will later be set by the caller. */ + if (inode->i_mode & S_IFMT) + err = -EIO; + + return err; +} + + +struct inode *squashfs_iget(struct super_block *sb, long long ino, + unsigned int ino_number) +{ + struct inode *inode = iget_locked(sb, ino_number); + int err; + + TRACE("Entered squashfs_iget\n"); + + if (!inode) + return ERR_PTR(-ENOMEM); + if (!(inode_state_read_once(inode) & I_NEW)) + return inode; + + err = squashfs_read_inode(inode, ino); + if (err) { + iget_failed(inode); + return ERR_PTR(err); + } + + unlock_new_inode(inode); + return inode; +} + + +/* + * Initialise VFS inode by reading inode from inode table (compressed + * metadata). The format and amount of data read depends on type. + */ +int squashfs_read_inode(struct inode *inode, long long ino) +{ + struct super_block *sb = inode->i_sb; + struct squashfs_sb_info *msblk = sb->s_fs_info; + u64 block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table; + int err, type, offset = SQUASHFS_INODE_OFFSET(ino); + union squashfs_inode squashfs_ino; + struct squashfs_base_inode *sqshb_ino = &squashfs_ino.base; + int xattr_id = SQUASHFS_INVALID_XATTR; + + TRACE("Entered squashfs_read_inode\n"); + + /* + * Read inode base common to all inode types. + */ + err = squashfs_read_metadata(sb, sqshb_ino, &block, + &offset, sizeof(*sqshb_ino)); + if (err < 0) + goto failed_read; + + err = squashfs_new_inode(sb, inode, sqshb_ino); + if (err) + goto failed_read; + + block = SQUASHFS_INODE_BLK(ino) + msblk->inode_table; + offset = SQUASHFS_INODE_OFFSET(ino); + + type = le16_to_cpu(sqshb_ino->inode_type); + switch (type) { + case SQUASHFS_REG_TYPE: { + unsigned int frag_offset, frag; + int frag_size; + u64 frag_blk; + struct squashfs_reg_inode *sqsh_ino = &squashfs_ino.reg; + + err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset, + sizeof(*sqsh_ino)); + if (err < 0) + goto failed_read; + + inode->i_size = le32_to_cpu(sqsh_ino->file_size); + frag = le32_to_cpu(sqsh_ino->fragment); + if (frag != SQUASHFS_INVALID_FRAG) { + /* + * the file cannot have a fragment (tailend) and have a + * file size a multiple of the block size + */ + if ((inode->i_size & (msblk->block_size - 1)) == 0) { + err = -EINVAL; + goto failed_read; + } + frag_offset = le32_to_cpu(sqsh_ino->offset); + frag_size = squashfs_frag_lookup(sb, frag, &frag_blk); + if (frag_size < 0) { + err = frag_size; + goto failed_read; + } + } else { + frag_blk = SQUASHFS_INVALID_BLK; + frag_size = 0; + frag_offset = 0; + } + + set_nlink(inode, 1); + inode->i_fop = &squashfs_file_operations; + inode->i_mode |= S_IFREG; + inode->i_blocks = ((inode->i_size - 1) >> 9) + 1; + squashfs_i(inode)->fragment_block = frag_blk; + squashfs_i(inode)->fragment_size = frag_size; + squashfs_i(inode)->fragment_offset = frag_offset; + squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block); + squashfs_i(inode)->block_list_start = block; + squashfs_i(inode)->offset = offset; + squashfs_i(inode)->parent = 0; + inode->i_data.a_ops = &squashfs_aops; + + TRACE("File inode %x:%x, start_block %llx, block_list_start " + "%llx, offset %x\n", SQUASHFS_INODE_BLK(ino), + offset, squashfs_i(inode)->start, block, offset); + break; + } + case SQUASHFS_LREG_TYPE: { + unsigned int frag_offset, frag; + int frag_size; + u64 frag_blk; + struct squashfs_lreg_inode *sqsh_ino = &squashfs_ino.lreg; + + err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset, + sizeof(*sqsh_ino)); + if (err < 0) + goto failed_read; + + inode->i_size = le64_to_cpu(sqsh_ino->file_size); + if (inode->i_size < 0) { + err = -EINVAL; + goto failed_read; + } + frag = le32_to_cpu(sqsh_ino->fragment); + if (frag != SQUASHFS_INVALID_FRAG) { + /* + * the file cannot have a fragment (tailend) and have a + * file size a multiple of the block size + */ + if ((inode->i_size & (msblk->block_size - 1)) == 0) { + err = -EINVAL; + goto failed_read; + } + frag_offset = le32_to_cpu(sqsh_ino->offset); + frag_size = squashfs_frag_lookup(sb, frag, &frag_blk); + if (frag_size < 0) { + err = frag_size; + goto failed_read; + } + } else { + frag_blk = SQUASHFS_INVALID_BLK; + frag_size = 0; + frag_offset = 0; + } + + xattr_id = le32_to_cpu(sqsh_ino->xattr); + set_nlink(inode, le32_to_cpu(sqsh_ino->nlink)); + inode->i_op = &squashfs_inode_ops; + inode->i_fop = &squashfs_file_operations; + inode->i_mode |= S_IFREG; + inode->i_blocks = (inode->i_size - + le64_to_cpu(sqsh_ino->sparse) + 511) >> 9; + + squashfs_i(inode)->fragment_block = frag_blk; + squashfs_i(inode)->fragment_size = frag_size; + squashfs_i(inode)->fragment_offset = frag_offset; + squashfs_i(inode)->start = le64_to_cpu(sqsh_ino->start_block); + squashfs_i(inode)->block_list_start = block; + squashfs_i(inode)->offset = offset; + squashfs_i(inode)->parent = 0; + inode->i_data.a_ops = &squashfs_aops; + + TRACE("File inode %x:%x, start_block %llx, block_list_start " + "%llx, offset %x\n", SQUASHFS_INODE_BLK(ino), + offset, squashfs_i(inode)->start, block, offset); + break; + } + case SQUASHFS_DIR_TYPE: { + struct squashfs_dir_inode *sqsh_ino = &squashfs_ino.dir; + + err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset, + sizeof(*sqsh_ino)); + if (err < 0) + goto failed_read; + + set_nlink(inode, le32_to_cpu(sqsh_ino->nlink)); + inode->i_size = le16_to_cpu(sqsh_ino->file_size); + inode->i_op = &squashfs_dir_inode_ops; + inode->i_fop = &squashfs_dir_ops; + inode->i_mode |= S_IFDIR; + squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block); + squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset); + squashfs_i(inode)->dir_idx_cnt = 0; + squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode); + + TRACE("Directory inode %x:%x, start_block %llx, offset %x\n", + SQUASHFS_INODE_BLK(ino), offset, + squashfs_i(inode)->start, + le16_to_cpu(sqsh_ino->offset)); + break; + } + case SQUASHFS_LDIR_TYPE: { + struct squashfs_ldir_inode *sqsh_ino = &squashfs_ino.ldir; + + err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset, + sizeof(*sqsh_ino)); + if (err < 0) + goto failed_read; + + xattr_id = le32_to_cpu(sqsh_ino->xattr); + set_nlink(inode, le32_to_cpu(sqsh_ino->nlink)); + inode->i_size = le32_to_cpu(sqsh_ino->file_size); + inode->i_op = &squashfs_dir_inode_ops; + inode->i_fop = &squashfs_dir_ops; + inode->i_mode |= S_IFDIR; + squashfs_i(inode)->start = le32_to_cpu(sqsh_ino->start_block); + squashfs_i(inode)->offset = le16_to_cpu(sqsh_ino->offset); + squashfs_i(inode)->dir_idx_start = block; + squashfs_i(inode)->dir_idx_offset = offset; + squashfs_i(inode)->dir_idx_cnt = le16_to_cpu(sqsh_ino->i_count); + squashfs_i(inode)->parent = le32_to_cpu(sqsh_ino->parent_inode); + + TRACE("Long directory inode %x:%x, start_block %llx, offset " + "%x\n", SQUASHFS_INODE_BLK(ino), offset, + squashfs_i(inode)->start, + le16_to_cpu(sqsh_ino->offset)); + break; + } + case SQUASHFS_SYMLINK_TYPE: + case SQUASHFS_LSYMLINK_TYPE: { + struct squashfs_symlink_inode *sqsh_ino = &squashfs_ino.symlink; + + err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset, + sizeof(*sqsh_ino)); + if (err < 0) + goto failed_read; + + inode->i_size = le32_to_cpu(sqsh_ino->symlink_size); + if (inode->i_size > PAGE_SIZE) { + ERROR("Corrupted symlink\n"); + return -EINVAL; + } + + set_nlink(inode, le32_to_cpu(sqsh_ino->nlink)); + inode->i_op = &squashfs_symlink_inode_ops; + inode_nohighmem(inode); + inode->i_data.a_ops = &squashfs_symlink_aops; + inode->i_mode |= S_IFLNK; + squashfs_i(inode)->start = block; + squashfs_i(inode)->offset = offset; + squashfs_i(inode)->parent = 0; + + if (type == SQUASHFS_LSYMLINK_TYPE) { + __le32 xattr; + + err = squashfs_read_metadata(sb, NULL, &block, + &offset, inode->i_size); + if (err < 0) + goto failed_read; + err = squashfs_read_metadata(sb, &xattr, &block, + &offset, sizeof(xattr)); + if (err < 0) + goto failed_read; + xattr_id = le32_to_cpu(xattr); + } + + TRACE("Symbolic link inode %x:%x, start_block %llx, offset " + "%x\n", SQUASHFS_INODE_BLK(ino), offset, + block, offset); + break; + } + case SQUASHFS_BLKDEV_TYPE: + case SQUASHFS_CHRDEV_TYPE: { + struct squashfs_dev_inode *sqsh_ino = &squashfs_ino.dev; + unsigned int rdev; + + err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset, + sizeof(*sqsh_ino)); + if (err < 0) + goto failed_read; + + if (type == SQUASHFS_CHRDEV_TYPE) + inode->i_mode |= S_IFCHR; + else + inode->i_mode |= S_IFBLK; + set_nlink(inode, le32_to_cpu(sqsh_ino->nlink)); + rdev = le32_to_cpu(sqsh_ino->rdev); + init_special_inode(inode, inode->i_mode, new_decode_dev(rdev)); + squashfs_i(inode)->parent = 0; + + TRACE("Device inode %x:%x, rdev %x\n", + SQUASHFS_INODE_BLK(ino), offset, rdev); + break; + } + case SQUASHFS_LBLKDEV_TYPE: + case SQUASHFS_LCHRDEV_TYPE: { + struct squashfs_ldev_inode *sqsh_ino = &squashfs_ino.ldev; + unsigned int rdev; + + err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset, + sizeof(*sqsh_ino)); + if (err < 0) + goto failed_read; + + if (type == SQUASHFS_LCHRDEV_TYPE) + inode->i_mode |= S_IFCHR; + else + inode->i_mode |= S_IFBLK; + xattr_id = le32_to_cpu(sqsh_ino->xattr); + inode->i_op = &squashfs_inode_ops; + set_nlink(inode, le32_to_cpu(sqsh_ino->nlink)); + rdev = le32_to_cpu(sqsh_ino->rdev); + init_special_inode(inode, inode->i_mode, new_decode_dev(rdev)); + squashfs_i(inode)->parent = 0; + + TRACE("Device inode %x:%x, rdev %x\n", + SQUASHFS_INODE_BLK(ino), offset, rdev); + break; + } + case SQUASHFS_FIFO_TYPE: + case SQUASHFS_SOCKET_TYPE: { + struct squashfs_ipc_inode *sqsh_ino = &squashfs_ino.ipc; + + err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset, + sizeof(*sqsh_ino)); + if (err < 0) + goto failed_read; + + if (type == SQUASHFS_FIFO_TYPE) + inode->i_mode |= S_IFIFO; + else + inode->i_mode |= S_IFSOCK; + set_nlink(inode, le32_to_cpu(sqsh_ino->nlink)); + init_special_inode(inode, inode->i_mode, 0); + squashfs_i(inode)->parent = 0; + break; + } + case SQUASHFS_LFIFO_TYPE: + case SQUASHFS_LSOCKET_TYPE: { + struct squashfs_lipc_inode *sqsh_ino = &squashfs_ino.lipc; + + err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset, + sizeof(*sqsh_ino)); + if (err < 0) + goto failed_read; + + if (type == SQUASHFS_LFIFO_TYPE) + inode->i_mode |= S_IFIFO; + else + inode->i_mode |= S_IFSOCK; + xattr_id = le32_to_cpu(sqsh_ino->xattr); + inode->i_op = &squashfs_inode_ops; + set_nlink(inode, le32_to_cpu(sqsh_ino->nlink)); + init_special_inode(inode, inode->i_mode, 0); + squashfs_i(inode)->parent = 0; + break; + } + default: + ERROR("Unknown inode type %d in squashfs_iget!\n", type); + return -EINVAL; + } + + if (xattr_id != SQUASHFS_INVALID_XATTR && msblk->xattr_id_table) { + err = squashfs_xattr_lookup(sb, xattr_id, + &squashfs_i(inode)->xattr_count, + &squashfs_i(inode)->xattr_size, + &squashfs_i(inode)->xattr); + if (err < 0) + goto failed_read; + inode->i_blocks += ((squashfs_i(inode)->xattr_size - 1) >> 9) + + 1; + } else + squashfs_i(inode)->xattr_count = 0; + + return 0; + +failed_read: + ERROR("Unable to read inode 0x%llx\n", ino); + return err; +} + + +const struct inode_operations squashfs_inode_ops = { + .listxattr = squashfs_listxattr +}; + -- cgit v1.3.1