diff options
| author | Kees Cook <[email protected]> | 2023-11-16 11:15:10 -0800 |
|---|---|---|
| committer | Kees Cook <[email protected]> | 2023-11-30 12:20:53 -0800 |
| commit | 40b2519d7566266d7eafd3c5232c73a497640bca (patch) | |
| tree | 9dfc5c39966ded80e08f4666cb516887b13da08e | |
| parent | cb6d2fd30dddd00499333e9475f8b11bbd84f37c (diff) | |
samples: Replace strlcpy() with strscpy()
strlcpy() reads the entire source buffer first. This read may exceed
the destination size limit. This is both inefficient and can lead
to linear read overflows if a source string is not NUL-terminated[1].
Additionally, it returns the size of the source string, not the
resulting size of the destination string. In an effort to remove strlcpy()
completely[2], replace strlcpy() here with strscpy().
Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy [1]
Link: https://github.com/KSPP/linux/issues/89 [2]
Cc: Masami Hiramatsu <[email protected]>
Cc: Valentin Schneider <[email protected]>
Cc: "Steven Rostedt (Google)" <[email protected]>
Cc: Chuck Lever <[email protected]>
Cc: Geliang Tang <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Christophe JAILLET <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Acked-by: "Steven Rostedt (Google)" <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Kees Cook <[email protected]>
| -rw-r--r-- | samples/trace_events/trace-events-sample.h | 2 | ||||
| -rw-r--r-- | samples/v4l/v4l2-pci-skeleton.c | 10 |
2 files changed, 6 insertions, 6 deletions
diff --git a/samples/trace_events/trace-events-sample.h b/samples/trace_events/trace-events-sample.h index 1c6b843b8c4e..23f923ccd529 100644 --- a/samples/trace_events/trace-events-sample.h +++ b/samples/trace_events/trace-events-sample.h @@ -305,7 +305,7 @@ TRACE_EVENT(foo_bar, ), TP_fast_assign( - strlcpy(__entry->foo, foo, 10); + strscpy(__entry->foo, foo, 10); __entry->bar = bar; memcpy(__get_dynamic_array(list), lst, __length_of(lst) * sizeof(int)); diff --git a/samples/v4l/v4l2-pci-skeleton.c b/samples/v4l/v4l2-pci-skeleton.c index a61f94db18d9..69ef788d9e3b 100644 --- a/samples/v4l/v4l2-pci-skeleton.c +++ b/samples/v4l/v4l2-pci-skeleton.c @@ -291,8 +291,8 @@ static int skeleton_querycap(struct file *file, void *priv, { struct skeleton *skel = video_drvdata(file); - strlcpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver)); - strlcpy(cap->card, "V4L2 PCI Skeleton", sizeof(cap->card)); + strscpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver)); + strscpy(cap->card, "V4L2 PCI Skeleton", sizeof(cap->card)); snprintf(cap->bus_info, sizeof(cap->bus_info), "PCI:%s", pci_name(skel->pdev)); return 0; @@ -597,11 +597,11 @@ static int skeleton_enum_input(struct file *file, void *priv, i->type = V4L2_INPUT_TYPE_CAMERA; if (i->index == 0) { i->std = SKEL_TVNORMS; - strlcpy(i->name, "S-Video", sizeof(i->name)); + strscpy(i->name, "S-Video", sizeof(i->name)); i->capabilities = V4L2_IN_CAP_STD; } else { i->std = 0; - strlcpy(i->name, "HDMI", sizeof(i->name)); + strscpy(i->name, "HDMI", sizeof(i->name)); i->capabilities = V4L2_IN_CAP_DV_TIMINGS; } return 0; @@ -845,7 +845,7 @@ static int skeleton_probe(struct pci_dev *pdev, const struct pci_device_id *ent) /* Initialize the video_device structure */ vdev = &skel->vdev; - strlcpy(vdev->name, KBUILD_MODNAME, sizeof(vdev->name)); + strscpy(vdev->name, KBUILD_MODNAME, sizeof(vdev->name)); /* * There is nothing to clean up, so release is set to an empty release * function. The release callback must be non-NULL. |