0002084: SysVIPC does not work on old kernels - BusyBox Bug and Patch Tracking

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Category

Severity

Reproducibility

Date Submitted

Last Update

0002084

[uClibc] Other

minor

always

02-07-08 20:00

03-13-08 05:22

Reporter

michael_d

View Status

public

Assigned To

uClibc

Priority

normal

Resolution

open

Status

assigned

Product Version

Summary

0002084: SysVIPC does not work on old kernels

Description

The functions shmctl(), semctl(), and msgctl() unconditionally or their subcommand argument with __IPC_64. That flag was only added in Linux 2.4, so they will always fail on older kernels.

I've prepared a patch to allow IPC to work on old kernels. Since __IPC_64 signals a different format of the syscall arguments and I haven't changed the userspace structures, a significant amount of marshalling code needed to be added.

The patch does need some adaptation before it can go into the mainline. Since it is not safe to include <linux/ipc.h>, I cannot probe whether the current kernel supports __IPC_64 or not. Thus, this patch will unconditionally use old kernel structures. I've left a "#if 0" in libc/misc/sysvipc/ipc.h that can be flipped to produce a library for 2.4+.

Additional Information

Attached Files

uClibc-0.9.29-ipc32.diff [^] (11,365 bytes) 02-07-08 20:00

uClibc-0.9.29-ipc32-newer.diff [^] (14,968 bytes) 03-13-08 05:20

Relationships

Notes
(0004934) vapier 02-15-08 15:41	make the code conditional on the versions of the kernel headers being compiled against

(0005714) michael_d 03-13-08 05:22	I don't like using kernel version numbers, since stuff gets backported occasionally. However, I've submitted a new version of the patch. This one checks the presence of the <asm/ipcbuf.h> header to detect an IPC64-supporting kernel.

Issue History
Date Modified	Username	Field	Change
02-07-08 20:00	michael_d	New Issue
02-07-08 20:00	michael_d	Status	new => assigned
02-07-08 20:00	michael_d	Assigned To	=> uClibc
02-07-08 20:00	michael_d	File Added: uClibc-0.9.29-ipc32.diff
02-15-08 15:41	vapier	Note Added: 0004934
03-13-08 05:20	michael_d	File Added: uClibc-0.9.29-ipc32-newer.diff
03-13-08 05:22	michael_d	Note Added: 0005714