https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81715
--- Comment #26 from Arnd Bergmann <arnd at linaro dot org> --- (In reply to Martin Liška from comment #25) > (In reply to Arnd Bergmann from comment #24) > > Ok, I don't have problem to implement the similar behavior in GCC 9. Looks > most > of warnings are in drivers. That should not be problem as I guess KASAN > build is > mainly used in a qemu machine (with syzkaller)? Thus exotic drivers should > not > be needed? I actually have no idea in what other ways it may be used, though I didn't think that running syzkaller was the only use case. It always feels like most bugs in the kernel are in obscure drivers, but then most of the kernel code consists of obscure drivers ;-) Here are some warnings in code that is actually being run. For the full output I see on linux-next, have a look at https://pastebin.com/CMJiUsuR. There are a couple of other warnings mixed in there as well that I'm working on addressing, but it's mainly the stack overflow once I turn on CONFIG_KASAN_EXTRA. arch/x86/kernel/cpu/mshyperv.c:261:1: warning: the frame size of 2704 bytes is larger than 2048 bytes [-Wframe-larger-than=] arch/x86/kvm/emulate.c:2552:1: warning: the frame size of 2128 bytes is larger than 2048 bytes [-Wframe-larger-than=] drivers/acpi/nfit/core.c:3168:1: warning: the frame size of 3952 bytes is larger than 2048 bytes [-Wframe-larger-than=] drivers/firmware/efi/test/efi_test.c:688:1: warning: the frame size of 2400 bytes is larger than 2048 bytes [-Wframe-larger-than=] drivers/gpu/drm/amd/amdgpu/../display/dc/bios/command_table.c:83:1: warning: the frame size of 3760 bytes is larger than 2048 bytes [-Wframe-larger-than=] drivers/md/md.c:8561:1: warning: the frame size of 2544 bytes is larger than 2048 bytes [-Wframe-larger-than=] drivers/net/bonding/bond_netlink.c:677:1: warning: the frame size of 2096 bytes is larger than 2048 bytes [-Wframe-larger-than=] fs/btrfs/relocation.c:1202:1: warning: the frame size of 4272 bytes is larger than 2048 bytes [-Wframe-larger-than=] fs/fscache/stats.c:287:1: warning: the frame size of 6536 bytes is larger than 2048 bytes [-Wframe-larger-than=] fs/jbd2/commit.c:1128:1: warning: the frame size of 3728 bytes is larger than 2048 bytes [-Wframe-larger-than=] fs/nfs/pnfs.c:1892:1: warning: the frame size of 2672 bytes is larger than 2048 bytes [-Wframe-larger-than=] fs/ntfs/mft.c:2756:1: warning: the frame size of 2352 bytes is larger than 2048 bytes [-Wframe-larger-than=] fs/userfaultfd.c:1824:1: warning: the frame size of 2256 bytes is larger than 2048 bytes [-Wframe-larger-than=] fs/xfs/libxfs/xfs_rmap.c:1334:1: warning: the frame size of 2384 bytes is larger than 2048 bytes [-Wframe-larger-than=] kernel/rcu/tree.c:2282:1: warning: the frame size of 3160 bytes is larger than 2048 bytes [-Wframe-larger-than=] lib/rbtree.c:481:1: warning: the frame size of 2520 bytes is larger than 2048 bytes [-Wframe-larger-than=] mm/khugepaged.c:1560:1: warning: the frame size of 2976 bytes is larger than 2048 bytes [-Wframe-larger-than=] mm/migrate.c:2129:1: warning: the frame size of 2104 bytes is larger than 2048 bytes [-Wframe-larger-than=] mm/page_alloc.c:3247:1: warning: the frame size of 4584 bytes is larger than 2048 bytes [-Wframe-larger-than=] mm/vmscan.c:1350:1: warning: the frame size of 5072 bytes is larger than 2048 bytes [-Wframe-larger-than=] net/bridge/br_netlink.c:1446:1: warning: the frame size of 2592 bytes is larger than 2048 bytes [-Wframe-larger-than=] net/core/ethtool.c:2832:1: warning: the frame size of 3376 bytes is larger than 2048 bytes [-Wframe-larger-than=] net/core/rtnetlink.c:1631:1: warning: the frame size of 2272 bytes is larger than 2048 bytes [-Wframe-larger-than=] net/mac80211/util.c:2188:1: warning: the frame size of 2464 bytes is larger than 2048 bytes [-Wframe-larger-than=] net/rxrpc/recvmsg.c:603:1: warning: the frame size of 2424 bytes is larger than 2048 bytes [-Wframe-larger-than=] net/sctp/socket.c:7271:1: warning: the frame size of 2704 bytes is larger than 2048 bytes [-Wframe-larger-than=] net/wireless/nl80211.c:1938:1: warning: the frame size of 4248 bytes is larger than 2048 bytes [-Wframe-larger-than=] > The middle red zone is only 32B. So I don't understand why 'Size' not used > for red zone > calculation? No idea.
