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Date: Fri, 16 Mar 2007 14:26:55 -0700 (PDT) From: Roland McGrath <roland@...hat.com> To: Ingo Molnar <mingo@...e.hu> Cc: Jakub Jelinek <jakub@...hat.com> Subject: Re: [patch 17/26] Xen-paravirt_ops: Add nosegneg capability to the vsyscall page notes > > +NOTE_KERNELCAP_BEGIN(1, 1) > > +NOTE_KERNELCAP(1, "nosegneg") > > +NOTE_KERNELCAP_END This should be: NOTE_KERNELCAP_BEGIN(1, 1) NOTE_KERNELCAP(0, "nosegneg") NOTE_KERNELCAP_END i.e. 1->0 in the "bit" member. (Note the ld.so.conf.d file must have the matching bit number for ldconfig-based lookups to do the right thing.) Or else: NOTE_KERNELCAP_BEGIN(1, 2) NOTE_KERNELCAP(0, "nosegneg") NOTE_KERNELCAP_END i.e. 1->2 in the "mask" member. (The mask value should be 1<<bit.) Some pre-release glibc's (before 2.4) had a bug in the code that parses this, and would crash parsing the correct note. Using the wrong bit value with nonmatching mask worked around this. IIRC, no glibc release ever included the buggy version of the code. In nonbuggy glibc, the mismatched value causes the "nosegneg" to be omitted from the directory search (under LD_LIBRARY_PATH and default directories), though ldconfig-based lookups will work (the most common case). Thanks, Roland - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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