August 2024 - kernelnewbies@kernelnewbies.org

How to contribute to the linux kernel
by Qianqiang Liu Sept. 24, 2024

Sept. 24, 2024

Hi all, I am an embedded software engineer. I use Linux every day, and I appreciate its neatness and simplicity. One day, I watched a video from Greg: https://youtu.be/LLBrBBImJt4, and I started wondering if maybe I could contribute to the Linux kernel. So, I sent a very simple (and maybe stupid) patch to the community: > On Fri, Aug 30, 2024 at 04:54:38PM +0800, Qianqiang Liu wrote: > There is no need to add parentheses around 'devcode != 0x0000' and > 'devcode != 0x9320' > > Signed-off-by: Qianqiang Liu <qianqiang.liu(a)163.com> > --- > drivers/staging/fbtft/fb_ili9320.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/staging/fbtft/fb_ili9320.c b/drivers/staging/fbtft/fb_ili9320.c > index 0be7c2d51548..409b54cc562e 100644 > --- a/drivers/staging/fbtft/fb_ili9320.c > +++ b/drivers/staging/fbtft/fb_ili9320.c > @@ -37,7 +37,7 @@ static int init_display(struct fbtft_par *par) > devcode = read_devicecode(par); > fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "Device code: 0x%04X\n", > devcode); > - if ((devcode != 0x0000) && (devcode != 0x9320)) > + if (devcode != 0x0000 && devcode != 0x9320) > dev_warn(par->info->device, > "Unrecognized Device code: 0x%04X (expected 0x9320)\n", > devcode); > -- > 2.39.2 It turns out that the patch was rejected. So, my question is: how can I start contributing to the Linux kernel? Maybe I could start by fixing some small bugs? Thanks, Qianqiang Liu

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Query Regarding Stack-Out-of-Bounds Error
by Muni Sekhar Aug. 31, 2024

Aug. 31, 2024

Dear Linux Kernel Community, I am writing to seek clarification on a potential stack-out-of-bounds issue observed during the calls to for_each_set_bit function or find_first_bit function, specifically in the following code snippet: static struct cmd_info *find_cmd_entry_any_ring(struct intel_gvt *gvt, unsigned int opcode, int rings) { struct cmd_info *info = NULL; unsigned int ring; ... for_each_set_bit(ring, (unsigned long *)&rings, I915_NUM_ENGINES) { In the above code, a 32-bit integer pointer (rings) is being cast to a 64-bit unsigned long pointer, which leads to an extra 4 bytes being accessed. This raises a concern regarding a stack-out-of-bounds bug. My specific query is: While it is logically understandable that a write operation involving these extra 4 bytes could cause a kernel crash, in this case, it is a read operation that is occurring. Would such a read operation still be capable of crashing the kernel or resulting in unpredictable system behaviour? If so, could you please explain how that would happen? I appreciate your insights and look forward to your guidance on this issue. -- Thanks, Sekhar

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Reproducing syzbot
by Kenneth Adam Miller Aug. 31, 2024

Aug. 31, 2024

Is there any way to obtain a downloadable version of something executable from syzbot that demonstrates the errors encountered?

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Separating driver and documentation changes
by Patryk Biel Aug. 22, 2024

Aug. 22, 2024

Hi I'm going to send a patch that extends existing driver with support for a new variant of the existing device. The changes in the drivr code are rather small, around 100 lines of code. Apart from the driver changes I would like to also update Documentation/devicetree/bindings for this driver to add the information about the new supported variant. Should I split the changes and send them separately? If so, how can I make sure that the documentation changes won't be merged to kernel source tree until the drive's modifications are merged? (if ofc maintainer decides to integrate them). Best regards Patryk

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how to change the tty dev color
by Dileep Sankhla Aug. 19, 2024

Aug. 19, 2024

hi, how to change the tty dev color which we get when we press ctrl + alt + f2/f3? -- Regards, Dileep

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Contributors to Raam Computer Software System Core are welcome
by Dileep Sankhla Aug. 7, 2024

Aug. 7, 2024

Raam Raam sa (greeting with God's name :) ) Raam Computer Software System and its Core are different from the (Unix) operating system and its kernel. There are many errors in the drivers that need to be corrected and new concepts are needed to be discussed before being implemented. To take this project as a full-time company, I need a co-founder and/or first of its developers. Contributions are helpful in this case. Project repository: https://github.com/robstat7/Raam Regards, Dileep

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