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Vasily Gorbik 2afdf47ef5 s390/disassembler: increase ebpf disasm buffer size 
commit 6f3353c2d2b3eb4de52e9704cb962712033db181 upstream.

Current ebpf disassembly buffer size of 64 is too small. E.g. this line
takes 65 bytes:
01fffff8005822e: ec8100ed8065\tclgrj\t%r8,%r1,8,001fffff80058408\n\0

Double the buffer size like it is done for the kernel disassembly buffer.

Fixes the following KASAN finding:

UG: KASAN: stack-out-of-bounds in print_fn_code+0x34c/0x380
Write of size 1 at addr 001fff800ad5f970 by task test_progs/853

CPU: 53 PID: 853 Comm: test_progs Not tainted
5.12.0-rc7-23786-g23457d86b1f0-dirty #19
Hardware name: IBM 3906 M04 704 (LPAR)
Call Trace:
 [<0000000cd8e0538a>] show_stack+0x17a/0x1668
 [<0000000cd8e2a5d8>] dump_stack+0x140/0x1b8
 [<0000000cd8e16e74>] print_address_description.constprop.0+0x54/0x260
 [<0000000cd75a8698>] kasan_report+0xc8/0x130
 [<0000000cd6e26da4>] print_fn_code+0x34c/0x380
 [<0000000cd6ea0f4e>] bpf_int_jit_compile+0xe3e/0xe58
 [<0000000cd72c4c88>] bpf_prog_select_runtime+0x5b8/0x9c0
 [<0000000cd72d1bf8>] bpf_prog_load+0xa78/0x19c0
 [<0000000cd72d7ad6>] __do_sys_bpf.part.0+0x18e/0x768
 [<0000000cd6e0f392>] do_syscall+0x12a/0x220
 [<0000000cd8e333f8>] __do_syscall+0x98/0xc8
 [<0000000cd8e54834>] system_call+0x6c/0x94
1 lock held by test_progs/853:
 #0: 0000000cd9bf7460 (report_lock){....}-{2:2}, at:
     kasan_report+0x96/0x130

addr 001fff800ad5f970 is located in stack of task test_progs/853 at
offset 96 in frame:
 print_fn_code+0x0/0x380
this frame has 1 object:
 [32, 96) 'buffer'

Memory state around the buggy address:
 001fff800ad5f800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 001fff800ad5f880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>001fff800ad5f900: 00 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 f3 f3
                                                             ^
 001fff800ad5f980: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 001fff800ad5fa00: 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 00

Cc: <stable@vger.kernel.org>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-05-22 10:59:12 +02:00
..
syscalls
kbuild: do not redirect the first prerequisite for filechk
2018-07-28 10:34:10 +09:00
vdso32
s390/kasan: avoid vdso instrumentation
2019-11-24 08:20:43 +01:00
vdso64
s390/vdso: fix vDSO clock_getres()
2020-06-30 23:17:14 -04:00
.gitignore
…
alternative.c
s390: add automatic detection of the spectre defense
2018-03-28 08:38:24 +02:00
asm-offsets.c
s390/vdso: fix vDSO clock_getres()
2020-06-30 23:17:14 -04:00
audit.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
audit.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
base.S
s390/kernel: use expoline for indirect branches
2018-05-07 21:12:39 +02:00
cache.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
compat_audit.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
compat_linux.c
mm: add ksys_readahead() helper; remove in-kernel calls to sys_readahead()
2018-04-02 20:16:12 +02:00
compat_linux.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
compat_ptrace.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
compat_signal.c
s390/compat: fix setup_frame32
2018-04-10 07:38:54 +02:00
compat_wrapper.c
s390: wire up rseq system call
2018-07-04 08:35:18 +02:00
cpcmd.c
s390/cpcmd: fix inline assembly register clobbering
2021-04-14 08:22:35 +02:00
crash_dump.c
s390/kdump: Remove kzalloc_panic
2018-08-16 14:49:15 +02:00
debug.c
s390/debug: avoid kernel warning on too large number of pages
2020-07-09 09:37:09 +02:00
diag.c
s390/ftrace: fix potential crashes when switching tracers
2020-05-10 10:30:09 +02:00
dis.c
s390/disassembler: increase ebpf disasm buffer size
2021-05-22 10:59:12 +02:00
dumpstack.c
s390: kernel: add SPDX identifiers to the remaining files
2017-11-24 15:37:12 +01:00
early_nobss.c
s390/early: move functions which may not access bss section to extra file
2018-05-09 10:55:01 +02:00
early_printk.c
s390/hibernate: fix error handling when suspend cpu != resume cpu
2018-09-20 13:20:23 +02:00
early.c
s390/kasan: fix early pgm check handler execution
2020-07-16 08:17:22 +02:00
ebcdic.c
s390: ebcdic: convert comments to UTF-8
2018-08-23 18:48:43 -07:00
entry.h
s390/boot: make head.S and als.c be part of the decompressor only
2018-06-25 10:14:38 +02:00
entry.S
s390/entry: save the caller of psw_idle
2021-04-28 13:16:52 +02:00
fpu.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ftrace.c
s390/function_graph: Simplify with function_graph_enter()
2018-12-05 19:32:10 +01:00
guarded_storage.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
2017-11-13 11:47:01 -08:00
head64.S
s390: correct _stext offset
2018-07-02 11:24:59 +02:00
idle.c
s390/idle: fix cpu idle time calculation
2019-11-06 13:06:20 +01:00
ipl.c
s390/ipl: remove reipl_method and dump_method
2018-04-10 07:39:00 +02:00
irq.c
s390: remove indirect branch from do_softirq_own_stack
2018-05-07 21:12:42 +02:00
jump_label.c
jump_label: move 'asm goto' support test to Kconfig
2019-06-04 08:02:34 +02:00
kdebugfs.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
kexec_elf.c
s390/kexec_file: Fix potential segment overlap in ELF loader
2020-01-27 14:50:42 +01:00
kexec_image.c
s390/kexec_file: Add crash support to image loader
2018-04-16 09:10:22 +02:00
kprobes.c
bpf/error-inject/kprobes: Clear current_kprobe and enable preempt in kprobe
2018-06-21 12:33:19 +02:00
lgr.c
s390: kernel: add SPDX identifiers to the remaining files
2017-11-24 15:37:12 +01:00
machine_kexec_file.c
s390/kexec_file: Add ELF loader
2018-04-16 09:10:23 +02:00
machine_kexec.c
s390/ipl: correct kdump reipl block checksum calculation
2018-04-10 07:39:00 +02:00
Makefile
s390/kasan: avoid instrumentation of early C code
2019-11-24 08:20:44 +01:00
mcount.S
s390/ftrace: save traced function caller
2020-06-07 13:17:55 +02:00
module.c
treewide: Use array_size() in vmalloc()
2018-06-12 16:19:22 -07:00
nmi.c
headers: untangle kmemleak.h from mm.h
2018-04-05 21:36:27 -07:00
nospec-branch.c
s390/speculation: Support 'mitigations=' cmdline option
2019-05-14 19:17:59 +02:00
nospec-sysfs.c
s390: detect etoken facility
2018-07-18 08:32:17 +02:00
os_info.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
perf_cpum_cf_events.c
treewide: kmalloc() -> kmalloc_array()
2018-06-12 16:19:22 -07:00
perf_cpum_cf.c
s390/cpum_cf: Reject request for sampling in event initialization
2018-12-17 09:24:32 +01:00
perf_cpum_sf.c
s390/cpum_sf.c: fix file permission for cpum_sfb_size
2020-11-24 13:27:26 +01:00
perf_event.c
s390: kernel: Remove redundant license text
2017-11-24 15:37:20 +01:00
perf_regs.c
s390/perf: fix gcc 8 array-bounds warning
2018-07-02 11:24:54 +02:00
pgm_check.S
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
process.c
s390/process: avoid potential reading of freed stack
2019-10-11 18:20:41 +02:00
processor.c
s390/cpuinfo: fix wrong output when CPU0 is offline
2020-04-23 10:30:18 +02:00
ptrace.c
s390/ptrace: fix storage key handling
2020-08-26 10:31:03 +02:00
reipl.S
s390/kernel: use expoline for indirect branches
2018-05-07 21:12:39 +02:00
relocate_kernel.S
s390: assume diag308 set always works
2018-04-10 07:38:59 +02:00
runtime_instr.c
s390/runtime_instrumentation: fix storage key handling
2020-08-26 10:31:03 +02:00
setup.c
s390/init: add missing __init annotations
2020-10-01 13:14:50 +02:00
signal.c
s390: wire up rseq system call
2018-07-04 08:35:18 +02:00
smp.c
s390/smp: __smp_rescan_cpus() - move cpumask away from stack
2021-03-17 16:43:46 +01:00
stacktrace.c
s390: kernel: add SPDX identifiers to the remaining files
2017-11-24 15:37:12 +01:00
sthyi.c
s390/sthyi: Fix machine name validity indication
2018-11-13 11:08:21 -08:00
suspend.c
s390: unify linker symbols usage
2018-02-27 08:05:23 +01:00
swsusp.S
s390/hibernate: fix error handling when suspend cpu != resume cpu
2018-09-20 13:20:23 +02:00
sys_s390.c
mm: add ksys_mmap_pgoff() helper; remove in-kernel calls to sys_mmap_pgoff()
2018-04-02 20:16:11 +02:00
sysinfo.c
s390/sysinfo: add missing #ifdef CONFIG_PROC_FS
2018-07-02 12:32:20 +02:00
time.c
s390/stp: add locking to sysfs functions
2020-11-05 11:08:51 +01:00
topology.c
s390/topology: avoid firing events before kobjs are created
2019-10-11 18:20:42 +02:00
trace.c
s390/ftrace: fix potential crashes when switching tracers
2020-05-10 10:30:09 +02:00
traps.c
signal/s390: Use force_sig_fault where appropriate
2018-04-25 10:44:08 -05:00
uprobes.c
s390/uprobes: implement arch_uretprobe_is_alive()
2018-04-23 07:57:16 +02:00
vdso.c
s390/vdso: correct vdso mapping for compat tasks
2019-11-20 18:47:53 +01:00
vmlinux.lds.S
s390: put _stext and _etext into .text section
2019-08-29 08:28:41 +02:00
vtime.c
s390: kernel: add SPDX identifiers to the remaining files
2017-11-24 15:37:12 +01:00