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Jason A. Donenfeld 81895a65ec treewide: use prandom_u32_max() when possible, part 1 
Rather than incurring a division or requesting too many random bytes for
the given range, use the prandom_u32_max() function, which only takes
the minimum required bytes from the RNG and avoids divisions. This was
done mechanically with this coccinelle script:

@basic@
expression E;
type T;
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
typedef u64;
@@
(
- ((T)get_random_u32() % (E))
+ prandom_u32_max(E)
|
- ((T)get_random_u32() & ((E) - 1))
+ prandom_u32_max(E * XXX_MAKE_SURE_E_IS_POW2)
|
- ((u64)(E) * get_random_u32() >> 32)
+ prandom_u32_max(E)
|
- ((T)get_random_u32() & ~PAGE_MASK)
+ prandom_u32_max(PAGE_SIZE)
)

@multi_line@
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
identifier RAND;
expression E;
@@

-       RAND = get_random_u32();
        ... when != RAND
-       RAND %= (E);
+       RAND = prandom_u32_max(E);

// Find a potential literal
@literal_mask@
expression LITERAL;
type T;
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
position p;
@@

        ((T)get_random_u32()@p & (LITERAL))

// Add one to the literal.
@script:python add_one@
literal << literal_mask.LITERAL;
RESULT;
@@

value = None
if literal.startswith('0x'):
        value = int(literal, 16)
elif literal[0] in '123456789':
        value = int(literal, 10)
if value is None:
        print("I don't know how to handle %s" % (literal))
        cocci.include_match(False)
elif value == 2**32 - 1 or value == 2**31 - 1 or value == 2**24 - 1 or value == 2**16 - 1 or value == 2**8 - 1:
        print("Skipping 0x%x for cleanup elsewhere" % (value))
        cocci.include_match(False)
elif value & (value + 1) != 0:
        print("Skipping 0x%x because it's not a power of two minus one" % (value))
        cocci.include_match(False)
elif literal.startswith('0x'):
        coccinelle.RESULT = cocci.make_expr("0x%x" % (value + 1))
else:
        coccinelle.RESULT = cocci.make_expr("%d" % (value + 1))

// Replace the literal mask with the calculated result.
@plus_one@
expression literal_mask.LITERAL;
position literal_mask.p;
expression add_one.RESULT;
identifier FUNC;
@@

-       (FUNC()@p & (LITERAL))
+       prandom_u32_max(RESULT)

@collapse_ret@
type T;
identifier VAR;
expression E;
@@

 {
-       T VAR;
-       VAR = (E);
-       return VAR;
+       return E;
 }

@drop_var@
type T;
identifier VAR;
@@

 {
-       T VAR;
        ... when != VAR
 }

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Yury Norov <yury.norov@gmail.com>
Reviewed-by: KP Singh <kpsingh@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz> # for ext4 and sbitmap
Reviewed-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com> # for drbd
Acked-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Heiko Carstens <hca@linux.ibm.com> # for s390
Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # for mmc
Acked-by: Darrick J. Wong <djwong@kernel.org> # for xfs
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-10-11 17:42:55 -06:00
..
alcor.c mmc: Set PROBE_PREFER_ASYNCHRONOUS for drivers that existed in v5.4 2020-09-07 14:24:21 +02:00
atmel-mci.c mmc: atmel-mci: Simplify if(chan) and if(!chan) 2022-05-04 11:56:02 +02:00
au1xmmc.c mmc: au1xmmc: Fix an error handling path in au1xmmc_probe() 2022-09-14 11:53:47 +02:00
bcm2835.c mmc: improve API to make clear hw_reset callback is for cards 2022-04-26 14:05:20 +02:00
cavium-octeon.c mmc: cavium-octeon: Add of_node_put() when breaking out of loop 2022-07-21 18:02:55 +02:00
cavium-thunderx.c mmc: cavium-thunderx: Add of_node_put() when breaking out of loop 2022-07-21 18:03:08 +02:00
cavium.c mmc: cavium: Use '"%s...", __func__' to print function name 2021-03-30 11:42:06 +02:00
cavium.h
cb710-mmc.c mmc: cb710: Use new tasklet API 2021-02-15 10:43:23 +01:00
cb710-mmc.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
cqhci-core.c mmc: cqhci: Capture eMMC and SD card errors 2022-07-12 12:25:35 +02:00
cqhci-crypto.c blk-crypto: rename blk_keyslot_manager to blk_crypto_profile 2021-10-21 10:49:32 -06:00
cqhci-crypto.h mmc: core: Store pointer to bio_crypt_ctx in mmc_request 2021-08-24 10:15:32 +02:00
cqhci.h mmc: cqhci: add cqhci_host_ops::program_key 2021-02-01 12:02:33 +01:00
davinci_mmc.c mmc: davinci_mmc: Handle error for clk_enable 2022-03-15 10:29:53 +01:00
dw_mmc-bluefield.c mmc: Set PROBE_PREFER_ASYNCHRONOUS for drivers that existed in v4.19 2020-09-07 14:24:21 +02:00
dw_mmc-exynos.c mmc: dw_mmc: exynos: Obviously always return success in remove callback 2022-07-12 12:25:37 +02:00
dw_mmc-exynos.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
dw_mmc-hi3798cv200.c mmc: dw_mmc: hi3789cv200: Obviously always return success in remove callback 2022-07-12 12:25:37 +02:00
dw_mmc-k3.c mmc: dw_mmc-k3: use the correct HiSilicon copyright 2021-03-31 14:47:53 +02:00
dw_mmc-pci.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
dw_mmc-pltfm.c mmc: dw_mmc-pltfm: Remove unused <linux/clk.h> 2021-06-14 13:57:42 +02:00
dw_mmc-pltfm.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
dw_mmc-rockchip.c mmc: dw_mmc: rockchip: Obviously always return success in remove callback 2022-07-12 12:25:38 +02:00
dw_mmc.c treewide: use prandom_u32_max() when possible, part 1 2022-10-11 17:42:55 -06:00
dw_mmc.h mmc: dw_mmc: Support setting f_min from host drivers 2022-03-07 12:56:38 +01:00
jz4740_mmc.c mmc: jz4740_mmc: Fix error check for dma_map_sg 2022-09-14 11:53:47 +02:00
Kconfig mmc: sdhci-of-aspeed: Add dependency on ARCH_ASPEED 2022-09-20 11:38:32 +02:00
litex_mmc.c mmc: Add driver for LiteX's LiteSDCard interface 2022-02-28 13:06:21 +01:00
Makefile mmc: Add driver for LiteX's LiteSDCard interface 2022-02-28 13:06:21 +01:00
meson-gx-mmc.c mmc: meson-gx: add SDIO interrupt support 2022-09-14 11:53:48 +02:00
meson-mx-sdhc-clkc.c mmc: meson-mx-sdhc: Drop unused MESON_SDHC_NUM_BUILTIN_CLKS macro 2021-12-20 11:19:01 +01:00
meson-mx-sdhc-mmc.c mmc: meson-mx-sdhc: Fix error check for dma_map_sg 2022-09-14 11:53:47 +02:00
meson-mx-sdhc.h mmc: host: meson-mx-sdhc: new driver for the Amlogic Meson SDHC host 2020-05-28 11:22:14 +02:00
meson-mx-sdio.c mmc: meson-mx-sdio: add IRQ check 2021-12-21 13:22:34 +01:00
mmc_hsq.c mmc: hsq: Fix data stomping during mmc recovery 2022-09-27 12:38:29 +02:00
mmc_hsq.h mmc: host: Introduce the request_atomic() for the host 2020-05-28 11:20:59 +02:00
mmc_spi.c spi: make remove callback a void function 2022-02-09 13:00:45 +00:00
mmci.c mmc: mmci: Fix typo in comment 2022-07-12 12:25:37 +02:00
mmci.h mmc: mmci_sdmmc: Implement signal voltage callbacks 2020-03-24 14:35:40 +01:00
mmci_qcom_dml.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 284 2019-06-05 17:36:37 +02:00
mmci_stm32_sdmmc.c mmc: mmci: stm32: use a buffer for unaligned DMA requests 2022-04-26 14:05:18 +02:00
moxart-mmc.c mmc: moxart: fix 4-bit bus width and remove 8-bit bus width 2022-09-14 12:11:08 +02:00
mtk-sd.c mmc: mtk-sd: Add support for MT6795 Helio X10 2022-09-20 11:36:43 +02:00
mvsdio.c mmc: Set PROBE_PREFER_ASYNCHRONOUS for drivers that existed in v4.4 2020-09-07 14:20:17 +02:00
mvsdio.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mxcmmc.c mmc: mxcmmc: Use mmc_card_sdio macro 2022-07-13 12:46:07 +02:00
mxs-mmc.c mmc: mxs-mmc: disable regulator on error and in the remove function 2021-10-19 13:02:58 +02:00
of_mmc_spi.c mmc: mmc_spi: parse speed mode options 2022-04-26 14:05:19 +02:00
omap.c mmc: omap: Make it CCF clk API compatible 2022-04-26 14:05:19 +02:00
omap_hsmmc.c mmc: omap_hsmmc: Revert special init for wl1251 2021-12-14 21:35:24 +01:00
owl-mmc.c mmc: owl-mmc: Remove unnecessary error log 2021-04-12 13:52:47 +02:00
pxamci.c mmc: pxamci: Fix another error handling path in pxamci_probe() 2022-08-15 15:59:33 +02:00
pxamci.h
renesas_sdhi.h mmc: renesas_sdhi: newer SoCs don't need manual tap correction 2022-07-21 18:03:41 +02:00
renesas_sdhi_core.c mmc: renesas_sdhi: newer SoCs don't need manual tap correction 2022-07-21 18:03:41 +02:00
renesas_sdhi_internal_dmac.c mmc: renesas_sdhi: newer SoCs don't need manual tap correction 2022-07-21 18:03:41 +02:00
renesas_sdhi_sys_dmac.c mmc: renesas_sdhi: Refactor renesas_sdhi_probe() 2021-08-24 10:15:35 +02:00
rtsx_pci_sdmmc.c Char/Misc and other driver updates for 5.18-rc1 2022-03-28 12:27:35 -07:00
rtsx_usb_sdmmc.c mmc: rtsx_usb_sdmmc: Remove the unneeded result variable 2022-09-20 14:18:15 +02:00
s3cmci.c mmc: s3cmci: move to use request_irq by IRQF_NO_AUTOEN flag 2021-06-14 13:57:34 +02:00
s3cmci.h MMC core: 2019-07-11 18:11:21 -07:00
sdhci-acpi.c ACPI / MMC: PM: Unify fixing up device power 2022-06-23 20:53:55 +02:00
sdhci-bcm-kona.c treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_30.RULE (part 2) 2022-06-10 14:51:35 +02:00
sdhci-brcmstb.c mmc: sdhci-brcmstb: use clk_get_rate(base_clk) in PM resume 2022-07-18 13:32:47 +02:00
sdhci-cadence.c mmc: Set PROBE_PREFER_ASYNCHRONOUS for drivers that existed in v4.14 2020-09-07 14:24:21 +02:00
sdhci-cns3xxx.c mmc: Set PROBE_PREFER_ASYNCHRONOUS for drivers that existed in v4.4 2020-09-07 14:20:17 +02:00
sdhci-dove.c mmc: Set PROBE_PREFER_ASYNCHRONOUS for drivers that existed in v4.4 2020-09-07 14:20:17 +02:00
sdhci-esdhc-imx.c mmc: sdhci-esdhc-imx: Add sdhc support for i.MXRT series 2021-12-14 21:35:26 +01:00
sdhci-esdhc-mcf.c mmc: sdhci: replace mmc->parent with mmc_dev() for consistency 2021-03-30 11:42:07 +02:00
sdhci-esdhc.h mmc: sdhci-of-esdhc: make sure delay chain locked for HS400 2020-10-28 11:07:01 +01:00
sdhci-iproc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_30.RULE (part 2) 2022-06-10 14:51:35 +02:00
sdhci-milbeaut.c mmc: Set PROBE_PREFER_ASYNCHRONOUS for drivers that are newer than 5.4 2020-09-07 14:24:21 +02:00
sdhci-msm.c mmc: sdhci-msm: add compatible string check for sdm670 2022-09-27 14:00:38 +02:00
sdhci-of-arasan.c mmc: sdhci-of-arasan: Obviously always return success in remove callback 2022-07-12 12:25:38 +02:00
sdhci-of-aspeed-test.c mmc: sdhci-of-aspeed: test: Use kunit_test_suite() macro 2022-07-11 17:13:32 -06:00
sdhci-of-aspeed.c mmc: sdhci-of-aspeed: test: Use kunit_test_suite() macro 2022-07-11 17:13:32 -06:00
sdhci-of-at91.c mmc: sdhci-of-at91: fix set_uhs_signaling rewriting of MC1R 2022-07-12 12:42:37 +02:00
sdhci-of-dwcmshc.c mmc: sdhci-of-dwcmshc: Re-enable support for the BlueField-3 SoC 2022-08-15 19:31:04 +02:00
sdhci-of-esdhc.c mmc: sdhci-of-esdhc: Fixup use of of_find_compatible_node() 2022-07-12 12:25:39 +02:00
sdhci-of-hlwd.c mmc: Set PROBE_PREFER_ASYNCHRONOUS for drivers that existed in v4.4 2020-09-07 14:20:17 +02:00
sdhci-of-sparx5.c mmc: Set PROBE_PREFER_ASYNCHRONOUS for drivers that are newer than 5.4 2020-09-07 14:24:21 +02:00
sdhci-omap.c mmc: sdhci-omap: Fix a lockdep warning for PM runtime init 2022-07-13 12:29:17 +02:00
sdhci-pci-arasan.c
sdhci-pci-core.c mmc: sdhci: Get rid of SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS 2022-09-28 10:08:50 +02:00
sdhci-pci-dwc-mshc.c
sdhci-pci-gli.c mmc: sdhci-pci-gli: Fix build error unused-function 2022-07-12 12:25:39 +02:00
sdhci-pci-o2micro.c mmc: sdhci-pci-o2micro: fix some SD cards compatibility issue at DDR50 mode 2022-09-14 11:53:47 +02:00
sdhci-pci.h mmc: sdhci-pci: Add PCI ID for Intel ADL 2021-12-14 21:35:25 +01:00
sdhci-pic32.c mmc: sdhci-pic32: Make pic32_sdhci_probe_platform() void 2020-11-16 11:59:30 +01:00
sdhci-pltfm.c mmc: Remove dev_err() usage after platform_get_irq() 2019-09-11 15:58:39 +02:00
sdhci-pltfm.h mmc: sdhci-pltfm: Fix linking err for sdhci-brcmstb 2021-02-01 11:13:09 +01:00
sdhci-pxav2.c mmc: Set PROBE_PREFER_ASYNCHRONOUS for drivers that existed in v4.4 2020-09-07 14:20:17 +02:00
sdhci-pxav3.c mmc: Set PROBE_PREFER_ASYNCHRONOUS for drivers that existed in v4.4 2020-09-07 14:20:17 +02:00
sdhci-s3c.c mmc: sdhci-s3c: drop unneeded MODULE_ALIAS 2021-10-12 10:21:18 +02:00
sdhci-spear.c mmc: Set PROBE_PREFER_ASYNCHRONOUS for drivers that existed in v4.4 2020-09-07 14:20:17 +02:00
sdhci-sprd.c mmc: sdhci-sprd: Fix the limitation of div 2022-09-20 11:34:06 +02:00
sdhci-st.c mmc: sdhci-st: Obviously always return success in remove callback 2022-07-12 12:25:38 +02:00
sdhci-tegra.c mmc: sdhci-tegra: Use of_device_get_match_data() helper 2022-02-28 13:06:22 +01:00
sdhci-xenon-phy.c mmc: sdhci-xenon: switch to device_* API 2020-12-11 10:08:37 +01:00
sdhci-xenon.c Revert "mmc: sdhci-xenon: fix annoying 1.8V regulator warning" 2022-04-04 12:17:46 +02:00
sdhci-xenon.h mmc: sdhci-xenon: switch to device_* API 2020-12-11 10:08:37 +01:00
sdhci.c mmc: sdhci: Centralize CMD and DATA reset handling 2022-09-28 10:08:56 +02:00
sdhci.h mmc: sdhci: Get rid of SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS 2022-09-28 10:08:50 +02:00
sdhci_am654.c mmc: sdhci_am654: Remove the unneeded result variable 2022-09-14 11:53:48 +02:00
sdhci_f_sdh30.c mmc: Set PROBE_PREFER_ASYNCHRONOUS for drivers that existed in v4.4 2020-09-07 14:20:17 +02:00
sdhci_f_sdh30.h mmc: sdhci-milbeaut: add Milbeaut SD controller driver 2019-11-13 16:10:16 +01:00
sdricoh_cs.c mmc: sdricoh_cs: Respect the cmd->busy_timeout from the mmc core 2020-05-28 11:22:14 +02:00
sh_mmcif.c mmc: sh_mmcif: move platform_data header to proper location 2022-04-26 14:05:21 +02:00
sunxi-mmc.c Merge branch 'fixes' into next 2022-05-04 11:52:07 +02:00
tifm_sd.c mmc: switch from 'pci_' to 'dma_' API 2021-08-24 16:59:39 +02:00
tmio_mmc.c mmc: tmio: avoid glitches when resetting 2022-07-12 12:31:32 +02:00
tmio_mmc.h mmc: tmio: avoid glitches when resetting 2022-07-12 12:31:32 +02:00
tmio_mmc_core.c mmc: tmio: avoid glitches when resetting 2022-07-12 12:31:32 +02:00
toshsd.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
toshsd.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
uniphier-sd.c mmc: improve API to make clear hw_reset callback is for cards 2022-04-26 14:05:20 +02:00
usdhi6rol0.c mmc: usdhi6rol0: Implement card_busy function 2021-08-24 15:16:08 +02:00
ushc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
via-sdmmc.c mmc: switch from 'pci_' to 'dma_' API 2021-08-24 16:59:39 +02:00
vub300.c mmc: vub300: fix control-message timeouts 2021-10-26 17:31:58 +02:00
wbsd.c mmc: wbsd: Use new tasklet API 2021-02-08 13:00:31 +01:00
wbsd.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
wmt-sdmmc.c mmc: wmt-sdmmc: Fix an error handling path in wmt_mci_probe() 2022-09-27 13:57:06 +02:00