| Message ID | YvfGY2qnl2YXrUgX@shikoro |
|---|---|
| State | New |
| Headers | show |
| Series | [PULL,REQUEST] i2c-for-5.20-part2 | expand |
On Sat, Aug 13, 2022 at 8:42 AM Wolfram Sang <wsa@kernel.org> wrote: > > * subsystem-wide move from strlcpy to strscpy Hmm. Looking around, we still do have a lot of those 'strlcpy()' users, but 99% of them don't use the return value. And since 'strlcpy()' is complete and utter garbage exactly *BECAUSE* of the bad return value (it returns the length of the source string - but an untrusted and possibly unterminated source string is often the *problem* in the first place), that would make it fairly easy to convert the rest. I see two possibilities: (a) fix strlcpy() by making it return 'void', and leave all those 99% of users alone, and convert the (few) cases that actually look at the return value to strscpy (b) auto-convert (with a coccinelle script) all the 'strlcpy()' users that don't care about the return value, and leave a few broken users of strlcpy around I think (b) is the simpler thing, but I have no idea how to write a coccinelle patch that basically does "if return value of strlcpy is not used, convert the strlcpy to a strscpy". I'd love to get rid of strlcpy() entirely, since it's such a horribly badly designed thing. Linus
The pull request you sent on Sat, 13 Aug 2022 17:42:27 +0200:
> git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git tags/i2c-for-5.20-part2
has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/04734361953b8cc30d5552c1abe907ccfc8bc0fa
Thank you!
> (b) auto-convert (with a coccinelle script) all the 'strlcpy()' users > that don't care about the return value, and leave a few broken users > of strlcpy around > > I think (b) is the simpler thing, but I have no idea how to write a > coccinelle patch that basically does "if return value of strlcpy is > not used, convert the strlcpy to a strscpy". That shouldn't be hard. I'll give it a try tomorrow.
On Sun, Aug 14, 2022 at 02:33:40AM +0200, Wolfram Sang wrote: > > > (b) auto-convert (with a coccinelle script) all the 'strlcpy()' users > > that don't care about the return value, and leave a few broken users > > of strlcpy around > > > > I think (b) is the simpler thing, but I have no idea how to write a > > coccinelle patch that basically does "if return value of strlcpy is > > not used, convert the strlcpy to a strscpy". > > That shouldn't be hard. I'll give it a try tomorrow. So, I tried right away and it was really as easy as expected: === @@ @@ - strlcpy + strscpy (...); === The ';' at the end ensures that spatch only looks for complete statements not containing anything more than expressed. I pushed out a branch for the testbots now: git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/strlcpy Patch granularity might not be perfect currently, but for testing this should do. All the best, Wolfram
On Sun, 14 Aug 2022, Wolfram Sang wrote: > On Sun, Aug 14, 2022 at 02:33:40AM +0200, Wolfram Sang wrote: > > > > > (b) auto-convert (with a coccinelle script) all the 'strlcpy()' users > > > that don't care about the return value, and leave a few broken users > > > of strlcpy around > > > > > > I think (b) is the simpler thing, but I have no idea how to write a > > > coccinelle patch that basically does "if return value of strlcpy is > > > not used, convert the strlcpy to a strscpy". > > > > That shouldn't be hard. I'll give it a try tomorrow. > > So, I tried right away and it was really as easy as expected: > > === > @@ > @@ > - strlcpy > + strscpy > (...); > === > > The ';' at the end ensures that spatch only looks for complete > statements not containing anything more than expressed. This is correct. julia > > I pushed out a branch for the testbots now: > > git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/strlcpy > > Patch granularity might not be perfect currently, but for testing this > should do. > > All the best, > > Wolfram > >
> I pushed out a branch for the testbots now: > > git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/strlcpy Pushed again with patches for userspace programs in 'tools/' and 'arch/um/os-Linux' removed. That was too late yesterday to notice them.
> Pushed again with patches for userspace programs in 'tools/' and > 'arch/um/os-Linux' removed. That was too late yesterday to notice them. Got a 'success' message now from the buildbot for the above branch.
The following changes since commit ffcf9c5700e49c0aee42dcba9a12ba21338e8136: x86: link vdso and boot with -z noexecstack --no-warn-rwx-segments (2022-08-10 18:30:09 -0700) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git tags/i2c-for-5.20-part2 for you to fetch changes up to fe99b819487dba848cddd3d4bf4beb8e653d7e9c: docs: i2c: i2c-sysfs: fix hyperlinks (2022-08-11 23:25:05 +0200) ---------------------------------------------------------------- * two driver fixes for issues introduced this cycle * one trivial driver improvement regarding ACPI * more DTS conversion and additions * documentation updates * subsystem-wide move from strlcpy to strscpy ---------------------------------------------------------------- Chris Pringle (1): i2c: kempld: Support ACPI I2C device declaration Conor Dooley (1): i2c: microchip-corei2c: fix erroneous late ack send Kewei Xu (2): dt-bindings: i2c: update bindings for mt8188 soc i2c: mediatek: add i2c compatible for MT8188 Krzysztof Kozlowski (1): dt-bindings: i2c: qcom,i2c-cci: convert to dtschema Luca Ceresoli (7): docs: i2c: i2c-protocol: update introductory paragraph docs: i2c: i2c-protocol,smbus-protocol: remove nonsense words docs: i2c: i2c-protocol: remove unused legend items docs: i2c: smbus-protocol: improve DataLow/DataHigh definition docs: i2c: instantiating-devices: add syntax coloring to dts and C blocks docs: i2c: i2c-sysfs: improve wording docs: i2c: i2c-sysfs: fix hyperlinks Robin Reckmann (1): i2c: qcom-geni: Fix GPI DMA buffer sync-back Wolfram Sang (2): i2c: move drivers from strlcpy to strscpy i2c: move core from strlcpy to strscpy with much appreciated quality assurance from ---------------------------------------------------------------- AngeloGioacchino Del Regno (1): (Rev.) i2c: mediatek: add i2c compatible for MT8188 Bagas Sanjaya (1): (Rev.) docs: i2c: smbus-protocol: improve DataLow/DataHigh definition Caleb Connolly (1): (Test) i2c: qcom-geni: Fix GPI DMA buffer sync-back Konrad Dybcio (1): (Rev.) i2c: qcom-geni: Fix GPI DMA buffer sync-back Lewis Hanly (1): (Test) i2c: microchip-corei2c: fix erroneous late ack send Luca Weiss (1): (Test) i2c: qcom-geni: Fix GPI DMA buffer sync-back Matthias Brugger (1): (Rev.) dt-bindings: i2c: update bindings for mt8188 soc Qii Wang (2): (Rev.) i2c: mediatek: add i2c compatible for MT8188 (Rev.) dt-bindings: i2c: update bindings for mt8188 soc Rob Herring (1): (Rev.) dt-bindings: i2c: qcom,i2c-cci: convert to dtschema .../devicetree/bindings/i2c/i2c-mt65xx.yaml | 1 + .../devicetree/bindings/i2c/i2c-qcom-cci.txt | 96 -------- .../devicetree/bindings/i2c/qcom,i2c-cci.yaml | 242 +++++++++++++++++++++ Documentation/i2c/i2c-protocol.rst | 11 +- Documentation/i2c/i2c-sysfs.rst | 24 +- Documentation/i2c/instantiating-devices.rst | 16 +- Documentation/i2c/smbus-protocol.rst | 6 +- MAINTAINERS | 2 +- drivers/i2c/busses/i2c-altera.c | 2 +- drivers/i2c/busses/i2c-aspeed.c | 2 +- drivers/i2c/busses/i2c-au1550.c | 2 +- drivers/i2c/busses/i2c-axxia.c | 2 +- drivers/i2c/busses/i2c-bcm-kona.c | 2 +- drivers/i2c/busses/i2c-brcmstb.c | 2 +- drivers/i2c/busses/i2c-cbus-gpio.c | 2 +- drivers/i2c/busses/i2c-cht-wc.c | 2 +- drivers/i2c/busses/i2c-cros-ec-tunnel.c | 2 +- drivers/i2c/busses/i2c-davinci.c | 2 +- drivers/i2c/busses/i2c-digicolor.c | 2 +- drivers/i2c/busses/i2c-eg20t.c | 2 +- drivers/i2c/busses/i2c-emev2.c | 2 +- drivers/i2c/busses/i2c-exynos5.c | 2 +- drivers/i2c/busses/i2c-gpio.c | 2 +- drivers/i2c/busses/i2c-highlander.c | 2 +- drivers/i2c/busses/i2c-hix5hd2.c | 2 +- drivers/i2c/busses/i2c-i801.c | 4 +- drivers/i2c/busses/i2c-ibm_iic.c | 2 +- drivers/i2c/busses/i2c-icy.c | 2 +- drivers/i2c/busses/i2c-imx-lpi2c.c | 2 +- drivers/i2c/busses/i2c-kempld.c | 1 + drivers/i2c/busses/i2c-lpc2k.c | 2 +- drivers/i2c/busses/i2c-meson.c | 2 +- drivers/i2c/busses/i2c-microchip-corei2c.c | 2 +- drivers/i2c/busses/i2c-mt65xx.c | 45 +++- drivers/i2c/busses/i2c-mt7621.c | 2 +- drivers/i2c/busses/i2c-mv64xxx.c | 2 +- drivers/i2c/busses/i2c-mxs.c | 2 +- drivers/i2c/busses/i2c-nvidia-gpu.c | 2 +- drivers/i2c/busses/i2c-omap.c | 2 +- drivers/i2c/busses/i2c-opal.c | 4 +- drivers/i2c/busses/i2c-parport.c | 2 +- drivers/i2c/busses/i2c-pxa.c | 2 +- drivers/i2c/busses/i2c-qcom-geni.c | 7 +- drivers/i2c/busses/i2c-qup.c | 2 +- drivers/i2c/busses/i2c-rcar.c | 2 +- drivers/i2c/busses/i2c-riic.c | 2 +- drivers/i2c/busses/i2c-rk3x.c | 2 +- drivers/i2c/busses/i2c-s3c2410.c | 2 +- drivers/i2c/busses/i2c-sh_mobile.c | 2 +- drivers/i2c/busses/i2c-simtec.c | 2 +- drivers/i2c/busses/i2c-taos-evm.c | 2 +- drivers/i2c/busses/i2c-tegra-bpmp.c | 2 +- drivers/i2c/busses/i2c-tegra.c | 2 +- drivers/i2c/busses/i2c-uniphier-f.c | 2 +- drivers/i2c/busses/i2c-uniphier.c | 2 +- drivers/i2c/busses/i2c-versatile.c | 2 +- drivers/i2c/busses/i2c-wmt.c | 2 +- drivers/i2c/i2c-core-base.c | 2 +- drivers/i2c/i2c-smbus.c | 2 +- 59 files changed, 370 insertions(+), 181 deletions(-) delete mode 100644 Documentation/devicetree/bindings/i2c/i2c-qcom-cci.txt create mode 100644 Documentation/devicetree/bindings/i2c/qcom,i2c-cci.yaml