* [Bug 205283] BUG: KASAN: global-out-of-bounds in _copy_to_iter+0x3d4/0x5a8
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--- Comment #1 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 285607
--> https://bugzilla.kernel.org/attachment.cgi?id=285607&action=edit
5.4.0-rc4 kernel .config (PowerMac G4 DP)
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Erhard F. (erhard_f@mailbox.org) changed:
What |Removed |Added
----------------------------------------------------------------------------
Kernel Version|5.4-rc4 |5.5-rc1
See Also| |https://bugzilla.kernel.org
| |/show_bug.cgi?id=205099
--- Comment #2 from Erhard F. (erhard_f@mailbox.org) ---
Re-tried with kernel 5.5-rc1. This is probably connected with bug #205099.
[...]
[ 69.181890]
==================================================================
[ 69.182220] BUG: KASAN: global-out-of-bounds in _copy_to_iter+0x3c0/0x594
[ 69.182472] Write of size 4096 at addr f15ad000 by task modprobe/233
[ 69.182738] CPU: 0 PID: 233 Comm: modprobe Tainted: G W
5.5.0-rc1-PowerMacG4+ #7
[ 69.183061] Call Trace:
[ 69.183147] [eb7138b8] [c0783b44] dump_stack+0xbc/0x118 (unreliable)
[ 69.183387] [eb7138e8] [c024454c]
print_address_description.isra.0+0x3c/0x420
[ 69.183652] [eb713978] [c0244b0c] __kasan_report+0x138/0x180
[ 69.183858] [eb7139b8] [c024551c] check_memory_region+0x24/0x180
[ 69.184084] [eb7139c8] [c02435e8] memcpy+0x48/0x74
[ 69.184255] [eb7139e8] [c045b5cc] _copy_to_iter+0x3c0/0x594
[ 69.184458] [eb713ad8] [c045b984] copy_page_to_iter+0xac/0x564
[ 69.184675] [eb713b38] [c01c6d84] generic_file_read_iter+0x5c4/0x7c0
[ 69.184914] [eb713ba8] [c025b8dc] __vfs_read+0x1b0/0x1f8
[ 69.185106] [eb713cd8] [c025b9e0] vfs_read+0xbc/0x124
[ 69.185287] [eb713d08] [c025ba9c] kernel_read+0x54/0x70
[ 69.185480] [eb713d38] [c0266514] kernel_read_file+0x23c/0x34c
[ 69.185694] [eb713de8] [c0266710] kernel_read_file_from_fd+0x54/0x74
[ 69.185929] [eb713e18] [c0111b1c] sys_finit_module+0xd8/0x138
[ 69.186139] [eb713f38] [c001a274] ret_from_syscall+0x0/0x34
[ 69.186340] --- interrupt: c01 at 0x56af78
LR = 0x6f8a14
[ 69.186597] Memory state around the buggy address:
[ 69.186766] f15ad500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 69.187001] f15ad580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 69.187235] >f15ad600: 00 00 00 00 00 00 00 00 00 00 00 fa fa fa fa fa
[ 69.187466] ^
[ 69.187656] f15ad680: 00 00 00 03 fa fa fa fa 00 00 00 00 00 00 00 00
[ 69.187890] f15ad700: 00 00 00 00 00 00 04 fa fa fa fa fa 00 00 00 00
[ 69.188121]
==================================================================
[ 69.272710] raid6: altivecx8 gen() 2354 MB/s
[ 69.329383] raid6: altivecx4 gen() 3200 MB/s
[ 69.386055] raid6: altivecx2 gen() 2178 MB/s
[ 69.442705] raid6: altivecx1 gen() 1975 MB/s
[ 69.499549] raid6: int32x8 gen() 336 MB/s
[ 69.556086] raid6: int32x8 xor() 200 MB/s
[ 69.612793] raid6: int32x4 gen() 342 MB/s
[ 69.669421] raid6: int32x4 xor() 224 MB/s
[ 69.732733] raid6: int32x2 gen() 534 MB/s
[ 69.796110] raid6: int32x2 xor() 414 MB/s
[ 69.859399] raid6: int32x1 gen() 401 MB/s
[ 69.922790] raid6: int32x1 xor() 310 MB/s
[ 69.930418] raid6: using algorithm altivecx4 gen() 3200 MB/s
[ 69.938166] raid6: using intx1 recovery algorithm
[ 70.027661] xor: measuring software checksum speed
[ 70.066059] 8regs : 123.600 MB/sec
[ 70.106036] 8regs_prefetch: 122.400 MB/sec
[ 70.146029] 32regs : 126.000 MB/sec
[ 70.186045] 32regs_prefetch: 122.400 MB/sec
[ 70.226030] altivec : 738.000 MB/sec
[ 70.233653] xor: using function: altivec (738.000 MB/sec)
[ 70.713528] Btrfs loaded, crc32c=crc32c-generic, debug=on
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--- Comment #3 from Erhard F. (erhard_f@mailbox.org) ---
Steps to reproduce:
1.) Configure G4 kernel with KASAN enabled
2.) Disable KASAN in lib/raid6/Makefile with KASAN_SANITIZE := n (to allow the
btrfs module to load)
3.) # modprobe -v btrfs
4.) # modprobe -r -v btrfs
5.) # modprobe -v btrfs
The 2nd time btrfs gets loaded I get this hit. But only once. Further attemps
to remove/load btrfs don't provoke the KASAN hit.
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--- Comment #4 from Christophe Leroy (christophe.leroy@c-s.fr) ---
Can you apply https://patchwork.ozlabs.org/patch/1213028/ and select
CONFIG_KASAN_VMALLOC
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--- Comment #5 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 286385
--> https://bugzilla.kernel.org/attachment.cgi?id=286385&action=edit
dmesg (kernel 5.5.0-rc2+, PowerMac G4 DP)
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--- Comment #6 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 286387
--> https://bugzilla.kernel.org/attachment.cgi?id=286387&action=edit
5.5.0-rc2+ kernel .config (PowerMac G4 DP)
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--- Comment #7 from Erhard F. (erhard_f@mailbox.org) ---
(In reply to Christophe Leroy from comment #4)
> Can you apply https://patchwork.ozlabs.org/patch/1213028/ and select
> CONFIG_KASAN_VMALLOC
Re-tried with 5.5-rc2 your KASAN_VMALLOC patch and this patch
(https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7de7de7ca0ae0fc70515ee3154af33af75edae2c)
to make -rc2 boot again.
Result with KASAN is the same as before. If I enable CONFIG_KASAN_VMALLOC
additionally the KASAN hit is gone. modprobing and removing btrfs shows no
error then. Interesting!
Double-checked it just to be sure.
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--- Comment #8 from Christophe Leroy (christophe.leroy@c-s.fr) ---
Thanks for the test.
Looking once more at module_alloc() in arch/powerpc/mm/kasan/kasan_init_32.c, I
think we are missing an initialisation.
In module_alloc(), in the call to __vmalloc_node_range(), could you try and
replace GFP_KERNEL by GFP_KERNEL | __GFP_ZERO
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--- Comment #9 from Erhard F. (erhard_f@mailbox.org) ---
module_alloc() in arch/powerpc/mm/kasan/kasan_init_32.c now is:
#if defined(CONFIG_MODULES) && !defined(CONFIG_KASAN_VMALLOC)
void *module_alloc(unsigned long size)
{
void *base;
base = __vmalloc_node_range(size, MODULE_ALIGN, VMALLOC_START,
VMALLOC_END,
GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL_EXEC,
VM_FLUSH_RESET_PERMS,
NUMA_NO_NODE, __builtin_return_address(0));
if (!base)
return NULL;
if (!kasan_init_region(base, size))
return base;
vfree(base);
return NULL;
}
#endif
The change does not seem to influence this bug however. Still a KASAN hit
without KASAN_VMALLOC and no hit with KASAN_VMALLOC enabled.
(bug #205099 does not show any change with KASAN_VMALLOC + modification).
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--- Comment #10 from Christophe Leroy (christophe.leroy@c-s.fr) ---
So it must be something more. By the way, now that KASAN_VMALLOC exists and
handle module loading better, I think we should analyse the impact of
activating KASAN_VMALLOC at all time.
Regarding #205099, I believe there's a real stack related bug in raid6_pq that
needs to be identified. Did you try with INLINE KASAN ?
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--- Comment #11 from Christophe Leroy (christophe.leroy@c-s.fr) ---
Series at https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=153133
drops the buggy module_alloc() and forces CONFIG_KASAN_VMALLOC when
CONFIG_MODULES is selected.
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--- Comment #12 from Erhard F. (erhard_f@mailbox.org) ---
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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Erhard F. (erhard_f@mailbox.org) changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #286387|0 |1
is obsolete| |
--- Comment #13 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 286865
--> https://bugzilla.kernel.org/attachment.cgi?id=286865&action=edit
5.5.0-rc6+ kernel .config (PowerMac G4 DP)
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Erhard F. (erhard_f@mailbox.org) changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #286385|0 |1
is obsolete| |
--- Comment #14 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 286867
--> https://bugzilla.kernel.org/attachment.cgi?id=286867&action=edit
dmesg (kernel 5.5.0-rc6+, PowerMac G4 DP)
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--- Comment #15 from Christophe Leroy (christophe.leroy@c-s.fr) ---
(In reply to Erhard F. from comment #12)
> Applied your patch series on top of 5.5-rc6. CONFIG_KASAN_VMALLOC is not
> non-selectable but forced on by default.
>
I can't understand.
When I'm using 'make menuconfig', as far as 'module support' is selected,
CONFIG_KASAN_VMALLOC is selected and cannot be unselected.
How do you manage to select something else than 'on' ?
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From: bugzilla-daemon @ 2020-01-18 11:30 UTC (permalink / raw)
To: linuxppc-dev
https://bugzilla.kernel.org/show_bug.cgi?id=205283
--- Comment #16 from Erhard F. (erhard_f@mailbox.org) ---
(In reply to Christophe Leroy from comment #15)
> (In reply to Erhard F. from comment #12)
> > Applied your patch series on top of 5.5-rc6. CONFIG_KASAN_VMALLOC is not
> > non-selectable but forced on by default.
> >
> I can't understand.
>
> When I'm using 'make menuconfig', as far as 'module support' is selected,
> CONFIG_KASAN_VMALLOC is selected and cannot be unselected.
>
> How do you manage to select something else than 'on' ?
Apologies for my fiddly wording. I see now that I wrote it's now 'not
non-selectable' which should have been 'not selectable' due to the patch
series.
Anyway, of course it's forced on by default as you said. This can be seen in
the short grep -i kasan .config I posted above.
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^ permalink raw reply [flat|nested] 18+ messages in thread* [Bug 205283] BUG: KASAN: global-out-of-bounds in _copy_to_iter+0x3d4/0x5a8
2019-10-22 0:05 [Bug 205283] New: BUG: KASAN: global-out-of-bounds in _copy_to_iter+0x3d4/0x5a8 bugzilla-daemon
` (15 preceding siblings ...)
2020-01-18 11:30 ` bugzilla-daemon
@ 2020-02-26 16:37 ` bugzilla-daemon
16 siblings, 0 replies; 18+ messages in thread
From: bugzilla-daemon @ 2020-02-26 16:37 UTC (permalink / raw)
To: linuxppc-dev
https://bugzilla.kernel.org/show_bug.cgi?id=205283
Erhard F. (erhard_f@mailbox.org) changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |CODE_FIX
--- Comment #17 from Erhard F. (erhard_f@mailbox.org) ---
Re-tested with 5.6-rc3 + KASAN_VMALLOC + VMAP_STACK + THREAD_SHIFT=14 + INLINE
KASAN. Works now, thanks!
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^ permalink raw reply [flat|nested] 18+ messages in thread