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| author |   Vincent Whitchurch <vincent.whitchurch@axis.com> | 2022-05-23 16:04:03 +0200 |
|---|---|---|
| committer |   Richard Weinberger <richard@nod.at> | 2022-05-27 09:03:41 +0200 |
| commit | 2a4a62a14be1947fa945c5c11ebf67326381a568 (patch) | |
| tree | 73328f4daeb23d1e322bfe6675486db52c1b2344 /arch/um/Kconfig | |
| parent | um: chan_user: Fix winch_tramp() return value (diff) | |
| download | linux-dev-2a4a62a14be1947fa945c5c11ebf67326381a568.tar.xz linux-dev-2a4a62a14be1947fa945c5c11ebf67326381a568.zip | |
um: Fix out-of-bounds read in LDT setup
syscall_stub_data() expects the data_count parameter to be the number of
longs, not bytes.
==================================================================
BUG: KASAN: stack-out-of-bounds in syscall_stub_data+0x70/0xe0
Read of size 128 at addr 000000006411f6f0 by task swapper/1
CPU: 0 PID: 1 Comm: swapper Not tainted 5.18.0+ #18
Call Trace:
show_stack.cold+0x166/0x2a7
__dump_stack+0x3a/0x43
dump_stack_lvl+0x1f/0x27
print_report.cold+0xdb/0xf81
kasan_report+0x119/0x1f0
kasan_check_range+0x3a3/0x440
memcpy+0x52/0x140
syscall_stub_data+0x70/0xe0
write_ldt_entry+0xac/0x190
init_new_ldt+0x515/0x960
init_new_context+0x2c4/0x4d0
mm_init.constprop.0+0x5ed/0x760
mm_alloc+0x118/0x170
0x60033f48
do_one_initcall+0x1d7/0x860
0x60003e7b
kernel_init+0x6e/0x3d4
new_thread_handler+0x1e7/0x2c0
The buggy address belongs to stack of task swapper/1
and is located at offset 64 in frame:
init_new_ldt+0x0/0x960
This frame has 2 objects:
[32, 40) 'addr'
[64, 80) 'desc'
==================================================================
Fixes: 858259cf7d1c443c83 ("uml: maintain own LDT entries")
Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Cc: stable@vger.kernel.org
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um/Kconfig')
0 files changed, 0 insertions, 0 deletions