Commit a1f9b1c0439db ("integrity/ima: switch to using __kernel_read") replaced the __vfs_read() call in integrity_kernel_read() with __kernel_read(), a new helper introduced by commit 61a707c543e2a ("fs: add a __kernel_read helper"). Since the new helper requires that also the FMODE_CAN_READ flag is set in file->f_mode, this patch saves the original f_mode and sets the flag if the file descriptor has the necessary file operation. Lastly, it restores the original f_mode at the end of ima_calc_file_hash(). Signed-off-by: Roberto Sassu <roberto.sassu@xxxxxxxxxx> --- security/integrity/ima/ima_crypto.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c index 21989fa0c107..22ed86a0c964 100644 --- a/security/integrity/ima/ima_crypto.c +++ b/security/integrity/ima/ima_crypto.c @@ -537,6 +537,7 @@ int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash) loff_t i_size; int rc; struct file *f = file; + fmode_t saved_mode; bool new_file_instance = false, modified_mode = false; /* @@ -550,7 +551,7 @@ int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash) } /* Open a new file instance in O_RDONLY if we cannot read */ - if (!(file->f_mode & FMODE_READ)) { + if (!(file->f_mode & FMODE_READ) || !(file->f_mode & FMODE_CAN_READ)) { int flags = file->f_flags & ~(O_WRONLY | O_APPEND | O_TRUNC | O_CREAT | O_NOCTTY | O_EXCL); flags |= O_RDONLY; @@ -562,7 +563,10 @@ int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash) */ pr_info_ratelimited("Unable to reopen file for reading.\n"); f = file; + saved_mode = f->f_mode; f->f_mode |= FMODE_READ; + if (likely(file->f_op->read || file->f_op->read_iter)) + f->f_mode |= FMODE_CAN_READ; modified_mode = true; } else { new_file_instance = true; @@ -582,7 +586,7 @@ int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash) if (new_file_instance) fput(f); else if (modified_mode) - f->f_mode &= ~FMODE_READ; + f->f_mode = saved_mode; return rc; } -- 2.27.GIT