From 9f0346dcbea363787186c94ef94dd01aaa215afa Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 5 Sep 2026 11:59:05 -0700 Subject: Merge tag 'driver-core-7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core Pull driver core fixes from Danilo Krummrich: - Fix kernfs listxattr() not returning security xattr names (e.g. SELinux labels) when the kernfs node has no allocated kernfs_iattrs - Fix silent truncation of IRQ vector indices in the Rust PCI abstractions - Don't select OF from DRIVER_PE_KUNIT_TEST; skip the test when OF is disabled instead of silently enabling extra kernel functionality - Russ Weight is retiring from kernel development; update the Firmware Loader sysfs contact to the driver-core mailing list, add a CREDITS entry for Firmware Upload, and update MAINTAINERS accordingly * tag 'driver-core-7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core: MAINTAINERS: Remove Russ Weight from Firmware Loader CREDITS: Add CREDITS entry for Firmware Upload firmware_loader: Change contact for sysfs nodes rust: pci: reject IRQ vector indices that do not fit in u32 kernfs: preserve security xattrs without allocating iattrs drivers: base: test: DRIVER_PE_KUNIT_TEST should not select OF --- arch/um/drivers/random.c | 121 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 121 insertions(+) create mode 100644 arch/um/drivers/random.c (limited to 'arch/um/drivers/random.c') diff --git a/arch/um/drivers/random.c b/arch/um/drivers/random.c new file mode 100644 index 000000000..ca08c91f4 --- /dev/null +++ b/arch/um/drivers/random.c @@ -0,0 +1,121 @@ +/* Copyright (C) 2005 - 2008 Jeff Dike */ + +/* Much of this ripped from drivers/char/hw_random.c, see there for other + * copyright. + * + * This software may be used and distributed according to the terms + * of the GNU General Public License, incorporated herein by reference. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * core module information + */ +#define RNG_MODULE_NAME "hw_random" + +/* Changed at init time, in the non-modular case, and at module load + * time, in the module case. Presumably, the module subsystem + * protects against a module being loaded twice at the same time. + */ +static int random_fd = -1; +static struct hwrng hwrng; +static DECLARE_COMPLETION(have_data); + +static int rng_dev_read(struct hwrng *rng, void *buf, size_t max, bool block) +{ + int ret; + + for (;;) { + ret = os_read_file(random_fd, buf, max); + if (block && ret == -EAGAIN) { + add_sigio_fd(random_fd); + + ret = wait_for_completion_killable(&have_data); + + ignore_sigio_fd(random_fd); + deactivate_fd(random_fd, RANDOM_IRQ); + + if (ret < 0) + break; + } else { + break; + } + } + + return ret != -EAGAIN ? ret : 0; +} + +static irqreturn_t random_interrupt(int irq, void *data) +{ + complete(&have_data); + + return IRQ_HANDLED; +} + +/* + * rng_init - initialize RNG module + */ +static int __init rng_init (void) +{ + int err; + + err = os_open_file("/dev/random", of_read(OPENFLAGS()), 0); + if (err < 0) + goto out; + + random_fd = err; + err = um_request_irq(RANDOM_IRQ, random_fd, IRQ_READ, random_interrupt, + 0, "random", NULL); + if (err < 0) + goto err_out_cleanup_hw; + + sigio_broken(); + hwrng.name = RNG_MODULE_NAME; + hwrng.read = rng_dev_read; + + err = hwrng_register(&hwrng); + if (err) { + pr_err(RNG_MODULE_NAME " registering failed (%d)\n", err); + goto err_out_cleanup_hw; + } +out: + return err; + +err_out_cleanup_hw: + os_close_file(random_fd); + random_fd = -1; + goto out; +} + +/* + * rng_cleanup - shutdown RNG module + */ + +static void cleanup(void) +{ + free_irq_by_fd(random_fd); + os_close_file(random_fd); +} + +static void __exit rng_cleanup(void) +{ + hwrng_unregister(&hwrng); + os_close_file(random_fd); +} + +module_init (rng_init); +module_exit (rng_cleanup); +__uml_exitcall(cleanup); + +MODULE_DESCRIPTION("UML Host Random Number Generator (RNG) driver"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1