From: David Turner Date: Tue, 24 Nov 2015 19:34:37 +0000 (-0500) Subject: ext4: Fix handling of extended tv_sec X-Git-Tag: v3.2.75~45 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6dfd5f6abf1825fc351f663bf630603f9b78251b;p=pandora-kernel.git ext4: Fix handling of extended tv_sec commit a4dad1ae24f850410c4e60f22823cba1289b8d52 upstream. In ext4, the bottom two bits of {a,c,m}time_extra are used to extend the {a,c,m}time fields, deferring the year 2038 problem to the year 2446. When decoding these extended fields, for times whose bottom 32 bits would represent a negative number, sign extension causes the 64-bit extended timestamp to be negative as well, which is not what's intended. This patch corrects that issue, so that the only negative {a,c,m}times are those between 1901 and 1970 (as per 32-bit signed timestamps). Some older kernels might have written pre-1970 dates with 1,1 in the extra bits. This patch treats those incorrectly-encoded dates as pre-1970, instead of post-2311, until kernel 4.20 is released. Hopefully by then e2fsck will have fixed up the bad data. Also add a comment explaining the encoding of ext4's extra {a,c,m}time bits. Signed-off-by: David Turner Signed-off-by: Theodore Ts'o Reported-by: Mark Harris Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=23732 Signed-off-by: Ben Hutchings --- Reading git-diff-tree failed