CVE-2024-26981 Information

May 04, 2024 cve

Description

In the Linux kernel the following vulnerability has been resolved:

nilfs2: fix OOB in nilfs_set_de_type

The size of the nilfs_type_by_mode array in the fs/nilfs2/dir.c file is defined as \S_IFMT » S_SHIFT\ but the nilfs_set_de_type() function which uses this array specifies the index to read from the array in the same way as (mode & S_IFMT) » S_SHIFT.

static void nilfs_set_de_type(struct nilfs_dir_entry de struct inode inode)

umode_t mode = inode->i_mode;

de->file_type = nilfs_type_by_mode[(mode & S_IFMT)>>S_SHIFT]; // oob

However when the index is determined this way an out-of-bounds (OOB) error occurs by referring to an index that is 1 larger than the array size when the condition \mode & S_IFMT == S_IFMT\ is satisfied. Therefore a patch to resize the nilfs_type_by_mode array should be applied to prevent OOB errors.

Reference

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