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samples: Replace strlcpy() with strscpy()

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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 <mhiramat@kernel.org>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: "Steven Rostedt (Google)" <rostedt@goodmis.org>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Geliang Tang <geliang.tang@suse.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Acked-by: "Steven Rostedt (Google)" <rostedt@goodmis.org>
Link: https://lore.kernel.org/r/20231116191510.work.550-kees@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2023-11-16 11:15:10 -08:00
parent cb6d2fd30d
commit 40b2519d75
2 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
samples/trace_events/trace-events-sample.h
View File

@ -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));

10
samples/v4l/v4l2-pci-skeleton.c
View File

@ -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.