Subject: [Bug 205283] BUG: KASAN: global-out-of-bounds in _copy_to_iter+0x3d4/0x5a8

From: [email-masked]
Date: Fri, 17 Jan 2020 20:01:41 +0000

https://bugzilla.kernel.org/show_bug.cgi?id=205283

--- Comment #12 from Erhard F. ([email-masked]) ---
Applied your patch series on top of 5.5-rc6. CONFIG_KASAN_VMALLOC is not
non-selectable but forced on by default.

Current situation is that the hit does not show up with KASAN and btrs module
unloading/re-loading.

 # grep -i kasan .config
CONFIG_HAVE_ARCH_KASAN=y
CONFIG_HAVE_ARCH_KASAN_VMALLOC=y
CONFIG_CC_HAS_KASAN_GENERIC=y
CONFIG_KASAN=y
CONFIG_KASAN_GENERIC=y
CONFIG_KASAN_OUTLINE=y
# CONFIG_KASAN_INLINE is not set
CONFIG_KASAN_STACK=1
CONFIG_KASAN_VMALLOC=y
# CONFIG_TEST_KASAN is not set
CONFIG_KASAN_SHADOW_OFFSET=0xe0000000

 # modprobe -r -v btrfs
rmmod btrfs
rmmod zlib_inflate
rmmod raid6_pq
rmmod zlib_deflate
rmmod lzo_decompress
rmmod lzo_compress
rmmod zstd_compress
rmmod zstd_decompress
rmmod xor
rmmod blake2b_generic
 # modprobe -v btrfs
insmod
/lib/modules/5.5.0-rc6-PowerMacG4+/kernel/lib/zlib_inflate/zlib_inflate.ko 
insmod /lib/modules/5.5.0-rc6-PowerMacG4+/kernel/lib/raid6/raid6_pq.ko 
insmod
/lib/modules/5.5.0-rc6-PowerMacG4+/kernel/lib/zlib_deflate/zlib_deflate.ko 
insmod /lib/modules/5.5.0-rc6-PowerMacG4+/kernel/lib/lzo/lzo_decompress.ko 
insmod /lib/modules/5.5.0-rc6-PowerMacG4+/kernel/lib/lzo/lzo_compress.ko 
insmod /lib/modules/5.5.0-rc6-PowerMacG4+/kernel/lib/zstd/zstd_compress.ko 
insmod /lib/modules/5.5.0-rc6-PowerMacG4+/kernel/lib/zstd/zstd_decompress.ko 
insmod /lib/modules/5.5.0-rc6-PowerMacG4+/kernel/crypto/xor.ko 
insmod /lib/modules/5.5.0-rc6-PowerMacG4+/kernel/crypto/blake2b_generic.ko 
insmod /lib/modules/5.5.0-rc6-PowerMacG4+/kernel/fs/btrfs/btrfs.ko

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