lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Fri, 08 Jun 2007 16:22:12 +1000 From: Herbert Xu <herbert@...dor.apana.org.au> To: Yanling.Qi@....com (Qi, Yanling) Cc: open-iscsi@...glegroups.com, netdev@...r.kernel.org, linux-scsi@...r.kernel.org, linux-iscsi-devel@...ts.sourceforge.net, michaelc@...wisc.edu, dougg@...que.net, James.Bottomley@...eleye.com Subject: Re: SG_IO with >4k buffer size to iscsi sg device causes "Bad page" panic Please don't drop CCs. Qi, Yanling <Yanling.Qi@....com> wrote: > >> Qi, Yanling <Yanling.Qi@....com> wrote: >> > @@ -2571,6 +2572,13 @@ sg_page_malloc(int rqSz, int lowDma, int >> > resp = (char *) __get_free_pages(page_mask, order); >> > /* try half */ >> > resSz = a_size; >> > } >> > + tmppage = virt_to_page(resp); >> > + for( m = PAGE_SIZE; m < resSz; m += PAGE_SIZE ) >> > + { >> > + tmppage++; >> > + SetPageReserved(tmppage); >> > + } >> > + >> > [Qi, Yanling] > If I do a get_page() at sg_page_malloc() time and then do a put_page() > at sg_page_free() time, I worry about a race condition that the page > gets re-used before calling free_pages(). Could you explain what is going to cause this page to be reused if it has a non-zero reference count? Thanks, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists