Hi sudip, I am declaring an array of 200 bytes as destination in ioctl processing function itself even i am sending 12 bytes from application. Here is the sample code how i am doing in kernel. ioctl_process(struct iwreq *wrq) { uint8 buffer[200]; copy_from_user(buffer, wrq->u.data.pointer, wrq->u.data.length); //This line itself is causing the problem for me. } Regards, Sateesh. On 07/19/2013 08:26 PM, Sudip Mukherjee wrote:
Hi Santosh Does your destination buffer have sufficient size to hold the data ?
Regards Sudip
On Fri, Jul 19, 2013 at 7:48 PM, Sateesh Kumar <sateesh.kumar@redpinesignals.com> wrote:
Dear Experts,
I am using the kernel 3.6.10 for my driver development. When I compiled the code I am getting the following warning. I am facing the same issue with 3.5.4 kernel.
"call to ‘copy_from_user_overflow’ declared with attribute warning: copy_from_user() buffer size is not provably correct"
When I try to install the module, I am facing the kernel crash. Here is the crash log.
//Kernel crash log - Start
Call Trace: [19592.491229] [<c044bbf2>] warn_slowpath_common+0x72/0xa0 [19592.491233] [<c06882b7>] ? copy_from_user_overflow+0x27/0x30 [19592.491236] [<c06882b7>] ? copy_from_user_overflow+0x27/0x30 [19592.491241] [<f86f54c0>] ? jtag_usb_card_read+0x70/0x70 [usb_jtag] [19592.491244] [<c044bcc3>] warn_slowpath_fmt+0x33/0x40 [19592.491247] [<c06882b7>] copy_from_user_overflow+0x27/0x30 [19592.491251] [<f86f54ec>] jtag_usb_ioctl+0x2c/0x80 [usb_jtag] [19592.491256] [<c0565dea>] do_vfs_ioctl+0x7a/0x590 [19592.491259] [<c055f41b>] ? putname+0x2b/0x40 [19592.491262] [<c055f41b>] ? putname+0x2b/0x40 [19592.491265] [<c0555238>] ? do_sys_open+0x158/0x1c0 [19592.491269] [<c0566368>] sys_ioctl+0x68/0x80 [19592.491274] [<c0980cdf>] sysenter_do_call+0x12/0x28 [19592.491276] ---[ end trace 98bdb358664246ac ]--- [19592.491277] copy_from_usr error
//Kernel crash log - End
Please let me know, what wrong with my driver?
Thanks in advance, Regards, Sateesh
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-- Regards, Sateesh.