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CVE-2023-53083

nfsd: don't replace page in rq_pages if it's a continuation of last page PUBLISHED

Description (CNA)

In the Linux kernel, the following vulnerability has been resolved: nfsd: don't replace page in rq_pages if it's a continuation of last page The splice read calls nfsd_splice_actor to put the pages containing file data into the svc_rqst->rq_pages array. It's possible however to get a splice result that only has a partial page at the end, if (e.g.) the filesystem hands back a short read that doesn't cover the whole page. nfsd_splice_actor will plop the partial page into its rq_pages array and return. Then later, when nfsd_splice_actor is called again, the remainder of the page may end up being filled out. At this point, nfsd_splice_actor will put the page into the array _again_ corrupting the reply. If this is done enough times, rq_next_page will overrun the array and corrupt the trailing fields -- the rq_respages and rq_next_page pointers themselves. If we've already added the page to the array in the last pass, don't add it to the array a second time when dealing with a splice continuation. This was originally handled properly in nfsd_splice_actor, but commit 91e23b1c3982 ("NFSD: Clean up nfsd_splice_actor()") removed the check for it.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected bf1cbe2f3650b4f4a8add6af933c6d7f6af1f361 before 8235cd619db6e67f1d7d26c55f1f3e4e575c947d; affected 56bc7e3821e847a6cc8027ddaba32e9a440225a5 before 12eca509234acb6b666802edf77408bb70d7bfca; affected 91e23b1c39820bfed642119ff6b6ef9f43cf09ce before 51ddb84baff6f09ad62b5999ece3ec172e4e3568; affected 91e23b1c39820bfed642119ff6b6ef9f43cf09ce before 0101067f376eb7b9afd00279270f25d5111a091d; affected 91e23b1c39820bfed642119ff6b6ef9f43cf09ce before 27c934dd8832dd40fd34776f916dc201e18b319b
Linux / Linuxaffected 5.19; unaffected 0 before 5.19; unaffected 6.1.22 through 6.1.*; unaffected 6.2.9 through 6.2.*; unaffected 6.3 through *

CWE

No CWE identifiers supplied.

References