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authorMimi Zohar <zohar@linux.vnet.ibm.com>2016-03-01 01:52:05 +0100
committerMimi Zohar <zohar@linux.vnet.ibm.com>2016-05-01 15:23:52 +0200
commit05d1a717ec0430c916a749b94eb90ab74bbfa356 (patch)
treed5283278e18669da5c76e41d1d33d58787dc61bc /security/yama/yama_lsm.c
parentima: fix ima_inode_post_setattr (diff)
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ima: add support for creating files using the mknodat syscall
Commit 3034a14 "ima: pass 'opened' flag to identify newly created files" stopped identifying empty files as new files. However new empty files can be created using the mknodat syscall. On systems with IMA-appraisal enabled, these empty files are not labeled with security.ima extended attributes properly, preventing them from subsequently being opened in order to write the file data contents. This patch defines a new hook named ima_post_path_mknod() to mark these empty files, created using mknodat, as new in order to allow the file data contents to be written. In addition, files with security.ima xattrs containing a file signature are considered "immutable" and can not be modified. The file contents need to be written, before signing the file. This patch relaxes this requirement for new files, allowing the file signature to be written before the file contents. Changelog: - defer identifying files with signatures stored as security.ima (based on Dmitry Rozhkov's comments) - removing tests (eg. dentry, dentry->d_inode, inode->i_size == 0) (based on Al's review) Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com> Cc: Al Viro <<viro@zeniv.linux.org.uk> Tested-by: Dmitry Rozhkov <dmitry.rozhkov@linux.intel.com>
Diffstat (limited to 'security/yama/yama_lsm.c')
0 files changed, 0 insertions, 0 deletions