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linux/drivers/char/hw_random
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Dominik Brodowski a43bed8220 hwrng: core - credit entropy for low quality sources of randomness 
In case the entropy quality is low, there may be less than one bit to
credit in the call to add_hwgenerator_randomness(): The number of bytes
returned by rng_get_data() multiplied by the current quality (in entropy
bits per 1024 bits of input) must be larger than 128 to credit at least
one bit. However, imx-rngc.c sets the quality to 19, but may return less
than 32 bytes; hid_u2fzero.c sets the quality to 1; and users may override
the quality setting manually.

In case there is less than one bit to credit, keep track of it and add
that credit to the next iteration.

Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2022-02-05 15:10:51 +11:00
..
amd-rng.c hwrng: rename 'mod_init' & 'mod_exit' functions to be module-specific 2021-07-16 15:49:36 +08:00
arm_smccc_trng.c hwrng: Add Arm SMCCC TRNG based driver 2021-08-06 19:45:26 +08:00
atmel-rng.c hwrng: atmel - add new platform support for sam9x60 2019-11-15 13:44:17 +08:00
ba431-rng.c hwrng: ba431 - use devm_platform_ioremap_resource() to simplify 2021-03-19 21:59:46 +11:00
bcm2835-rng.c hwrng: bcm2835 - add reset support 2021-03-13 00:04:06 +11:00
cavium-rng-vf.c hwrng: cavium - Check health status while reading random data 2021-11-20 15:02:07 +11:00
cavium-rng.c hwrng: cavium - Check health status while reading random data 2021-11-20 15:02:07 +11:00
cctrng.c hwrng: cctrng - delete redundant printing of return value 2021-03-19 21:59:47 +11:00
cctrng.h hwrng: cctrng - introduce Arm CryptoCell driver 2020-04-16 16:49:20 +10:00
cn10k-rng.c hwrng: cn10k - Add random number generator support 2021-12-24 14:18:22 +11:00
core.c hwrng: core - credit entropy for low quality sources of randomness 2022-02-05 15:10:51 +11:00
exynos-trng.c hwrng: exynos - Use pm_runtime_resume_and_get() to replace open coding 2021-06-03 20:24:04 +08:00
geode-rng.c hwrng: rename 'mod_init' & 'mod_exit' functions to be module-specific 2021-07-16 15:49:36 +08:00
hisi-rng.c hwrng: hisi - Fix W=1 unused variable warning 2020-07-09 18:25:12 +10:00
imx-rngc.c hwrng: imx-rngc - irq already prints an error 2020-11-06 14:31:15 +11:00
ingenic-rng.c crypto: ingenic - Drop kfree for memory allocated with devm_kzalloc 2020-08-21 14:43:51 +10:00
ingenic-trng.c hwrng: ingenic - Fix a resource leak in an error handling path 2021-01-03 08:41:37 +11:00
intel-rng.c hwrng: rename 'mod_init' & 'mod_exit' functions to be module-specific 2021-07-16 15:49:36 +08:00
iproc-rng200.c hwrng: iproc-rng200 - Move enable/disable in separate function 2021-01-03 08:41:37 +11:00
ixp4xx-rng.c hwrng: ixp4xx - Make use of the helper function devm_platform_ioremap_resource() 2021-09-17 11:06:14 +08:00
Kconfig hwrng: cavium - HW_RANDOM_CAVIUM should depend on ARCH_THUNDER 2022-01-31 11:21:37 +11:00
ks-sa-rng.c hwrng: ks-sa - Use pm_runtime_resume_and_get() to replace open coding 2021-06-03 20:24:04 +08:00
Makefile - added support for more BCM47XX based devices 2022-01-14 15:08:36 +01:00
meson-rng.c hwrng: meson - Improve error handling for core clock 2021-10-01 14:41:23 +08:00
mtk-rng.c hwrng: mtk - Force runtime pm ops for sleep ops 2021-10-08 20:02:47 +08:00
mxc-rnga.c hwrng: mxc-rnga - use semicolons rather than commas to separate statements 2020-10-02 18:02:15 +10:00
n2-asm.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
n2-drv.c hwrng: n2-drv - fix typo 2019-08-08 12:07:49 +10:00
n2rng.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nomadik-rng.c amba: Make the remove callback return void 2021-02-02 14:25:50 +01:00
npcm-rng.c hwrng: npcm - modify readl to readb 2020-10-02 18:02:13 +10:00
octeon-rng.c hwrng: octeon - Fix sparse warnings 2020-07-09 18:25:14 +10:00
omap-rng.c hwrng: omap - Use pm_runtime_resume_and_get() to replace open coding 2021-06-03 20:24:04 +08:00
omap3-rom-rng.c change email address for Pali Rohár 2020-04-10 15:36:22 -07:00
optee-rng.c hwrng: optee - Use device-managed registration API 2021-02-10 17:55:58 +11:00
pasemi-rng.c hwrng: pasemi - use devm_platform_ioremap_resource() to simplify code 2019-10-26 02:09:56 +11:00
pic32-rng.c hwrng: pic32 - Use device-managed registration API 2021-03-13 00:04:00 +11:00
powernv-rng.c hwrng: drivers - Use device-managed registration API 2019-08-02 14:44:33 +10:00
pseries-rng.c char: hw_random: pseries-rng: Demote non-conformant kernel-doc header 2021-05-21 10:09:30 +02:00
s390-trng.c hwrng: s390 - replace snprintf in show functions with sysfs_emit 2021-10-22 20:24:12 +08:00
st-rng.c hwrng: st - Fix W=1 unused variable warning 2020-07-09 18:25:12 +10:00
stm32-rng.c hwrng: stm32 - use semicolons rather than commas to separate statements 2020-10-02 18:02:14 +10:00
timeriomem-rng.c hwrng: timeriomem - Use device-managed registration API 2021-02-10 17:56:01 +11:00
via-rng.c hwrng: rename 'mod_init' & 'mod_exit' functions to be module-specific 2021-07-16 15:49:36 +08:00
virtio-rng.c hwrng: virtio - unregister device before reset 2022-01-14 18:50:52 -05:00
xgene-rng.c hwrng: xgene - Delete an error message in xgene_rng_probe() 2020-04-16 16:49:22 +10:00
xiphera-trng.c hwrng: xiphera-trng - use devm_platform_ioremap_resource() to simplify 2021-03-07 15:13:14 +11:00