Author: markj
Date: Fri Sep 4 00:12:28 2020
New Revision: 365319
URL: https://svnweb.freebsd.org/changeset/base/365319
Log:
Add emulation support for the Linux kcov(4) ioctl API.
This makes it possible to run an unmodified Linux syzkaller executor
against the Linuxulator, and have it gather code coverage information.
Sponsored by: The FreeBSD Foundation
Modified:
head/sys/compat/lindebugfs/lindebugfs.c
head/sys/compat/linsysfs/linsysfs.c
head/sys/compat/linux/linux_ioctl.c
head/sys/compat/linux/linux_ioctl.h
Modified: head/sys/compat/lindebugfs/lindebugfs.c
==============================================================================
--- head/sys/compat/lindebugfs/lindebugfs.c Fri Sep 4 00:11:01 2020
(r365318)
+++ head/sys/compat/lindebugfs/lindebugfs.c Fri Sep 4 00:12:28 2020
(r365319)
@@ -299,6 +299,9 @@ debugfs_init(PFS_INIT_ARGS)
{
debugfs_root = pi->pi_root;
+
+ (void)debugfs_create_symlink("kcov", NULL, "/dev/kcov");
+
return (0);
}
Modified: head/sys/compat/linsysfs/linsysfs.c
==============================================================================
--- head/sys/compat/linsysfs/linsysfs.c Fri Sep 4 00:11:01 2020
(r365318)
+++ head/sys/compat/linsysfs/linsysfs.c Fri Sep 4 00:12:28 2020
(r365319)
@@ -624,6 +624,8 @@ linsysfs_init(PFS_INIT_ARGS)
struct pfs_node *net;
struct pfs_node *power_supply;
struct pfs_node *devdir, *chardev;
+ struct pfs_node *kernel;
+ struct pfs_node *debug;
devclass_t devclass;
device_t dev;
@@ -671,6 +673,11 @@ linsysfs_init(PFS_INIT_ARGS)
linsysfs_listcpus(cpu);
linsysfs_listnics(net);
+
+ /* /sys/kernel */
+ kernel = pfs_create_dir(root, "kernel", NULL, NULL, NULL, 0);
+ /* /sys/kernel/debug, mountpoint for lindebugfs. */
+ debug = pfs_create_dir(kernel, "debug", NULL, NULL, NULL, 0);
return (0);
}
Modified: head/sys/compat/linux/linux_ioctl.c
==============================================================================
--- head/sys/compat/linux/linux_ioctl.c Fri Sep 4 00:11:01 2020
(r365318)
+++ head/sys/compat/linux/linux_ioctl.c Fri Sep 4 00:12:28 2020
(r365319)
@@ -50,6 +50,7 @@ __FBSDID("$FreeBSD$");
#include <sys/filio.h>
#include <sys/jail.h>
#include <sys/kbio.h>
+#include <sys/kcov.h>
#include <sys/kernel.h>
#include <sys/linker_set.h>
#include <sys/lock.h>
@@ -117,6 +118,7 @@ static linux_ioctl_function_t linux_ioctl_v4l2;
static linux_ioctl_function_t linux_ioctl_special;
static linux_ioctl_function_t linux_ioctl_fbsd_usb;
static linux_ioctl_function_t linux_ioctl_evdev;
+static linux_ioctl_function_t linux_ioctl_kcov;
static struct linux_ioctl_handler cdrom_handler =
{ linux_ioctl_cdrom, LINUX_IOCTL_CDROM_MIN, LINUX_IOCTL_CDROM_MAX };
@@ -146,6 +148,8 @@ static struct linux_ioctl_handler fbsd_usb =
{ linux_ioctl_fbsd_usb, FBSD_LUSB_MIN, FBSD_LUSB_MAX };
static struct linux_ioctl_handler evdev_handler =
{ linux_ioctl_evdev, LINUX_IOCTL_EVDEV_MIN, LINUX_IOCTL_EVDEV_MAX };
+static struct linux_ioctl_handler kcov_handler =
+{ linux_ioctl_kcov, LINUX_KCOV_MIN, LINUX_KCOV_MAX };
DATA_SET(linux_ioctl_handler_set, cdrom_handler);
DATA_SET(linux_ioctl_handler_set, vfat_handler);
@@ -161,6 +165,7 @@ DATA_SET(linux_ioctl_handler_set, video_handler);
DATA_SET(linux_ioctl_handler_set, video2_handler);
DATA_SET(linux_ioctl_handler_set, fbsd_usb);
DATA_SET(linux_ioctl_handler_set, evdev_handler);
+DATA_SET(linux_ioctl_handler_set, kcov_handler);
/*
* Keep sorted by low.
@@ -3570,6 +3575,38 @@ linux_ioctl_evdev(struct thread *td, struct linux_ioct
args->cmd = (args->cmd & ~IOC_DIRMASK) | IOC_INOUT;
return (sys_ioctl(td, (struct ioctl_args *)args));
+}
+
+static int
+linux_ioctl_kcov(struct thread *td, struct linux_ioctl_args *args)
+{
+ int error;
+
+ error = 0;
+ switch (args->cmd & 0xffff) {
+ case LINUX_KCOV_INIT_TRACE:
+ args->cmd = KIOSETBUFSIZE;
+ break;
+ case LINUX_KCOV_ENABLE:
+ args->cmd = KIOENABLE;
+ if (args->arg == 0)
+ args->arg = KCOV_MODE_TRACE_PC;
+ else if (args->arg == 1)
+ args->arg = KCOV_MODE_TRACE_CMP;
+ else
+ error = EINVAL;
+ break;
+ case LINUX_KCOV_DISABLE:
+ args->cmd = KIODISABLE;
+ break;
+ default:
+ error = ENOTTY;
+ break;
+ }
+
+ if (error == 0)
+ error = sys_ioctl(td, (struct ioctl_args *)args);
+ return (error);
}
/*
Modified: head/sys/compat/linux/linux_ioctl.h
==============================================================================
--- head/sys/compat/linux/linux_ioctl.h Fri Sep 4 00:11:01 2020
(r365318)
+++ head/sys/compat/linux/linux_ioctl.h Fri Sep 4 00:12:28 2020
(r365319)
@@ -762,6 +762,17 @@
#define LINUX_IOCTL_EVDEV_MAX 0x45ff
#define LINUX_IOCTL_EVDEV_CLK LINUX_CLOCK_REALTIME | \
LINUX_CLOCK_MONOTONIC |LINUX_CLOCK_BOOTTIME
+
+/*
+ * kcov(4) shims
+ */
+#define LINUX_KCOV_MIN 0x6300
+#define LINUX_KCOV_MAX 0x63ff
+#define LINUX_KCOV_INIT_TRACE 0x6301
+#define LINUX_KCOV_ENABLE 0x6364
+#define LINUX_KCOV_DISABLE 0x6365
+#define LINUX_KCOV_REMOTE_ENABLE 0x6366
+
/*
* Pluggable ioctl handlers
*/
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