Re: CONFIG_DEBUG_RODATA prevents kprobes from working on 2.6.22-rc2
William Cohen <[EMAIL PROTECTED]> writes: > > Shouldn't mark_rodata_ro be less agressive when CONFIG_KPROBES is > enabled? Or should kprobes temporarily change the page to be > writeable, set the break point, and then return the page to read only? The later. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: CONFIG_DEBUG_RODATA prevents kprobes from working on 2.6.22-rc2
William Cohen [EMAIL PROTECTED] writes: Shouldn't mark_rodata_ro be less agressive when CONFIG_KPROBES is enabled? Or should kprobes temporarily change the page to be writeable, set the break point, and then return the page to read only? The later. -Andi - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
CONFIG_DEBUG_RODATA prevents kprobes from working on 2.6.22-rc2
The recent changes in the 2.6.22-rc2 kernel to the write protection of read only data enable by CONFIG_DEBUG_RODATA prevents kprobes from working. At least on the on i386 and x86_64 machine the mark_rodata_ro() function marks memory starting from _text as read only. Thus, when kprobes attempts to write a break point into a location in the kernel it faults. There is a description of the problem at: http://sources.redhat.com/bugzilla/show_bug.cgi?id=4531 Shouldn't mark_rodata_ro be less agressive when CONFIG_KPROBES is enabled? Or should kprobes temporarily change the page to be writeable, set the break point, and then return the page to read only? -Will - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
CONFIG_DEBUG_RODATA prevents kprobes from working on 2.6.22-rc2
The recent changes in the 2.6.22-rc2 kernel to the write protection of read only data enable by CONFIG_DEBUG_RODATA prevents kprobes from working. At least on the on i386 and x86_64 machine the mark_rodata_ro() function marks memory starting from _text as read only. Thus, when kprobes attempts to write a break point into a location in the kernel it faults. There is a description of the problem at: http://sources.redhat.com/bugzilla/show_bug.cgi?id=4531 Shouldn't mark_rodata_ro be less agressive when CONFIG_KPROBES is enabled? Or should kprobes temporarily change the page to be writeable, set the break point, and then return the page to read only? -Will - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
