The branch main has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=b0dfc48684780024a3d736c5a5449284dad97f4e
commit b0dfc48684780024a3d736c5a5449284dad97f4e Author: Mark Johnston <[email protected]> AuthorDate: 2021-07-10 00:38:21 +0000 Commit: Mark Johnston <[email protected]> CommitDate: 2021-07-10 00:38:50 +0000 uma: Fix a few problems with KASAN integration - Ensure that all items returned by UMA are aligned to KASAN_SHADOW_SCALE (8). This was true in practice since smaller alignments are not used by any consumers, but we should enforce it anyway. - Use a non-zero code for marking redzones that appear naturally in items that are not a multiple of the scale factor in size. Currently we do not modify keg layouts to force the creation of redzones. - Use a non-zero code for marking freed per-CPU items, otherwise accesses of freed per-CPU items are not detected by the runtime. Sponsored by: The FreeBSD Foundation --- sys/vm/uma_core.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/sys/vm/uma_core.c b/sys/vm/uma_core.c index d2e01f3a0605..59cc960d3dd9 100644 --- a/sys/vm/uma_core.c +++ b/sys/vm/uma_core.c @@ -556,11 +556,12 @@ kasan_mark_item_valid(uma_zone_t zone, void *item) sz = zone->uz_size; rsz = roundup2(sz, KASAN_SHADOW_SCALE); if ((zone->uz_flags & UMA_ZONE_PCPU) == 0) { - kasan_mark(item, sz, rsz, 0); + kasan_mark(item, sz, rsz, KASAN_GENERIC_REDZONE); } else { pcpu_item = zpcpu_base_to_offset(item); for (i = 0; i <= mp_maxid; i++) - kasan_mark(zpcpu_get_cpu(pcpu_item, i), sz, rsz, 0); + kasan_mark(zpcpu_get_cpu(pcpu_item, i), sz, rsz, + KASAN_GENERIC_REDZONE); } } @@ -580,7 +581,8 @@ kasan_mark_item_invalid(uma_zone_t zone, void *item) } else { pcpu_item = zpcpu_base_to_offset(item); for (i = 0; i <= mp_maxid; i++) - kasan_mark(zpcpu_get_cpu(pcpu_item, i), 0, sz, 0); + kasan_mark(zpcpu_get_cpu(pcpu_item, i), 0, sz, + KASAN_UMA_FREED); } } @@ -2238,6 +2240,14 @@ keg_layout(uma_keg_t keg) PRINT_UMA_ZFLAGS)); alignsize = keg->uk_align + 1; +#ifdef KASAN + /* + * ASAN requires that each allocation be aligned to the shadow map + * scale factor. + */ + if (alignsize < KASAN_SHADOW_SCALE) + alignsize = KASAN_SHADOW_SCALE; +#endif /* * Calculate the size of each allocation (rsize) according to _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/dev-commits-src-all To unsubscribe, send any mail to "[email protected]"
