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authorLinus Torvalds <torvalds@linux-foundation.org>2020-10-15 19:01:51 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2020-10-15 19:01:51 +0200
commit726eb70e0d34dc4bc4dada71f52bba8ed638431e (patch)
treee49674616f4513c8c6a4746a08e93c9441708d34 /drivers/char
parentMerge tag 'usb-5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gre... (diff)
parentbinder: fix UAF when releasing todo list (diff)
downloadlinux-726eb70e0d34dc4bc4dada71f52bba8ed638431e.tar.xz
linux-726eb70e0d34dc4bc4dada71f52bba8ed638431e.zip
Merge tag 'char-misc-5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc driver updates from Greg KH: "Here is the big set of char, misc, and other assorted driver subsystem patches for 5.10-rc1. There's a lot of different things in here, all over the drivers/ directory. Some summaries: - soundwire driver updates - habanalabs driver updates - extcon driver updates - nitro_enclaves new driver - fsl-mc driver and core updates - mhi core and bus updates - nvmem driver updates - eeprom driver updates - binder driver updates and fixes - vbox minor bugfixes - fsi driver updates - w1 driver updates - coresight driver updates - interconnect driver updates - misc driver updates - other minor driver updates All of these have been in linux-next for a while with no reported issues" * tag 'char-misc-5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (396 commits) binder: fix UAF when releasing todo list docs: w1: w1_therm: Fix broken xref, mistakes, clarify text misc: Kconfig: fix a HISI_HIKEY_USB dependency LSM: Fix type of id parameter in kernel_post_load_data prototype misc: Kconfig: add a new dependency for HISI_HIKEY_USB firmware_loader: fix a kernel-doc markup w1: w1_therm: make w1_poll_completion static binder: simplify the return expression of binder_mmap test_firmware: Test partial read support firmware: Add request_partial_firmware_into_buf() firmware: Store opt_flags in fw_priv fs/kernel_file_read: Add "offset" arg for partial reads IMA: Add support for file reads without contents LSM: Add "contents" flag to kernel_read_file hook module: Call security_kernel_post_load_data() firmware_loader: Use security_post_load_data() LSM: Introduce kernel_post_load_data() hook fs/kernel_read_file: Add file_size output argument fs/kernel_read_file: Switch buffer size arg to size_t fs/kernel_read_file: Remove redundant size argument ...
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/Kconfig3
-rw-r--r--drivers/char/lp.c6
-rw-r--r--drivers/char/mem.c28
-rw-r--r--drivers/char/mspec.c5
4 files changed, 35 insertions, 7 deletions
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index b1bd336761b1..d229a2d0c017 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -93,8 +93,9 @@ config PPDEV
config VIRTIO_CONSOLE
tristate "Virtio console"
- depends on VIRTIO && TTY
+ depends on TTY
select HVC_DRIVER
+ select VIRTIO
help
Virtio console for use with hypervisors.
diff --git a/drivers/char/lp.c b/drivers/char/lp.c
index 45932f05fd67..0ec73917d8dd 100644
--- a/drivers/char/lp.c
+++ b/drivers/char/lp.c
@@ -853,8 +853,10 @@ static void lp_console_write(struct console *co, const char *s,
count--;
do {
written = parport_write(port, crlf, i);
- if (written > 0)
- i -= written, crlf += written;
+ if (written > 0) {
+ i -= written;
+ crlf += written;
+ }
} while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
}
} while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index abd4ffdc8cde..94c2b556cf97 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -726,6 +726,33 @@ static ssize_t read_iter_zero(struct kiocb *iocb, struct iov_iter *iter)
return written;
}
+static ssize_t read_zero(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ size_t cleared = 0;
+
+ while (count) {
+ size_t chunk = min_t(size_t, count, PAGE_SIZE);
+ size_t left;
+
+ left = clear_user(buf + cleared, chunk);
+ if (unlikely(left)) {
+ cleared += (chunk - left);
+ if (!cleared)
+ return -EFAULT;
+ break;
+ }
+ cleared += chunk;
+ count -= chunk;
+
+ if (signal_pending(current))
+ break;
+ cond_resched();
+ }
+
+ return cleared;
+}
+
static int mmap_zero(struct file *file, struct vm_area_struct *vma)
{
#ifndef CONFIG_MMU
@@ -921,6 +948,7 @@ static const struct file_operations zero_fops = {
.llseek = zero_lseek,
.write = write_zero,
.read_iter = read_iter_zero,
+ .read = read_zero,
.write_iter = write_iter_zero,
.mmap = mmap_zero,
.get_unmapped_area = get_unmapped_area_zero,
diff --git a/drivers/char/mspec.c b/drivers/char/mspec.c
index 0fae33319d2e..f8231e2e84be 100644
--- a/drivers/char/mspec.c
+++ b/drivers/char/mspec.c
@@ -195,10 +195,7 @@ mspec_mmap(struct file *file, struct vm_area_struct *vma,
pages = vma_pages(vma);
vdata_size = sizeof(struct vma_data) + pages * sizeof(long);
- if (vdata_size <= PAGE_SIZE)
- vdata = kzalloc(vdata_size, GFP_KERNEL);
- else
- vdata = vzalloc(vdata_size);
+ vdata = kvzalloc(vdata_size, GFP_KERNEL);
if (!vdata)
return -ENOMEM;