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Re: [PATCH][BZ #13724] Do not segfault in pthread_setname_np (x, NULL)
- From: "Carlos O'Donell" <carlos at redhat dot com>
- To: Jeff Law <law at redhat dot com>
- Cc: Rich Felker <dalias at aerifal dot cx>, OndÅej BÃlka <neleai at seznam dot cz>, libc-alpha at sourceware dot org
- Date: Wed, 09 Oct 2013 13:53:38 -0400
- Subject: Re: [PATCH][BZ #13724] Do not segfault in pthread_setname_np (x, NULL)
- Authentication-results: sourceware.org; auth=none
- References: <20131003122009 dot GA8891 at domone dot podge> <524DCA52 dot 2030609 at redhat dot com> <20131007141928 dot GV20515 at brightrain dot aerifal dot cx> <52542C63 dot 10305 at redhat dot com> <20131008162738 dot GG20515 at brightrain dot aerifal dot cx> <52545389 dot 6000901 at redhat dot com> <52545730 dot 6090306 at redhat dot com>
On 10/08/2013 03:04 PM, Jeff Law wrote:
>> It seems incredibly useful to enable the asserts and trigger these
>> violations as early as possible. If you don't care you can disable
>> the asserts?
> Another approach would be similar to what we're doing with memstomp.
> ie, build a set of wrappers which check for these argument goofs and
> allow users to dl-preload DSOs with the wrappers.
> When I first proposed the idea for these sanity checking dl-preload
> libraries for Fedora I envisioned that we could go beyond just
> checking for overlapping memory areas in the mem* and str* functions.
> There could be a set of pthread wrapper functions that check for
> whatever invariants we can in the pthread* functions without a huge
> performance hit.
Right, you could wrap everything up and check all inputs against
non-NULL where the headers say __attribute__ ((__nonnull__ params))
or __nonnull(params) (short-hand in glibc).