diff options
| author | Kees Cook <keescook@chromium.org> | 2020-10-02 10:38:25 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-10-05 13:37:04 +0200 |
| commit | 0fa8e084648779eeb8929ae004301b3acf3bad84 (patch) | |
| tree | ebfed647c8f2a43a0967ba127c7e75df36909cba /kernel/kexec_file.c | |
| parent | 34736daeecd1608bee21e3bf5170cd4c95143109 (diff) | |
| download | lwn-0fa8e084648779eeb8929ae004301b3acf3bad84.tar.gz lwn-0fa8e084648779eeb8929ae004301b3acf3bad84.zip | |
fs/kernel_file_read: Add "offset" arg for partial reads
To perform partial reads, callers of kernel_read_file*() must have a
non-NULL file_size argument and a preallocated buffer. The new "offset"
argument can then be used to seek to specific locations in the file to
fill the buffer to, at most, "buf_size" per call.
Where possible, the LSM hooks can report whether a full file has been
read or not so that the contents can be reasoned about.
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20201002173828.2099543-14-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/kexec_file.c')
| -rw-r--r-- | kernel/kexec_file.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index ee51c1028658..84f7316792a7 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -221,7 +221,7 @@ kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd, int ret; void *ldata; - ret = kernel_read_file_from_fd(kernel_fd, &image->kernel_buf, + ret = kernel_read_file_from_fd(kernel_fd, 0, &image->kernel_buf, INT_MAX, NULL, READING_KEXEC_IMAGE); if (ret < 0) return ret; @@ -241,7 +241,7 @@ kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd, #endif /* It is possible that there no initramfs is being loaded */ if (!(flags & KEXEC_FILE_NO_INITRAMFS)) { - ret = kernel_read_file_from_fd(initrd_fd, &image->initrd_buf, + ret = kernel_read_file_from_fd(initrd_fd, 0, &image->initrd_buf, INT_MAX, NULL, READING_KEXEC_INITRAMFS); if (ret < 0) |