Song Liu <s...@kernel.org> writes: > On Wed, Feb 12, 2025 at 11:26 PM Puranjay Mohan <puran...@kernel.org> wrote: >> >> Song Liu <s...@kernel.org> writes: >> >> > On Wed, Feb 12, 2025 at 4:10 PM Indu Bhagat <indu.bha...@oracle.com> wrote: >> >> >> >> On 2/12/25 3:32 PM, Song Liu wrote: >> >> > I run some tests with this set and my RFC set [1]. Most of >> >> > the test is done with kpatch-build. I tested both Puranjay's >> >> > version [3] and my version [4]. >> >> > >> >> > For gcc 14.2.1, I have seen the following issue with this >> >> > test [2]. This happens with both upstream and 6.13.2. >> >> > The livepatch loaded fine, but the system spilled out the >> >> > following warning quickly. >> >> > >> >> >> >> In presence of the issue >> >> https://sourceware.org/bugzilla/show_bug.cgi?id=32666, I'd expect bad >> >> data in SFrame section. Which may be causing this symptom? >> >> >> >> To be clear, the issue affects loaded kernel modules. I cannot tell for >> >> certain - is there module loading involved in your test ? >> > >> > The KLP is a module, I guess that is also affected? >> > >> > During kpatch-build, we added some logic to drop the .sframe section. >> > I guess this is wrong, as we need the .sframe section when we apply >> > the next KLP. However, I don't think the issue is caused by missing >> > .sframe section. >> >> Hi, I did the same testing and did not get the Warning. >> >> I am testing on the 6.12.11 kernel with GCC 11.4.1. > > Could you please also try kernel 6.13.2? >
I have tested with 6.13.2, here are the results:
[ec2-user@ip-172-31-32-86 ~]$ uname -r
6.13.2+
My tree looks like:
[ec2-user@ip-172-31-32-86 linux-upstream]$ git log --oneline
bdf4086dd (HEAD) arm64: Enable livepatch for ARM64
3904c7058 arm64: Define TIF_PATCH_PENDING for livepatch
b5de442a9 unwind: arm64: add reliable stacktrace support for arm64
fdc243fa8 unwind: arm64: Add sframe unwinder on arm64
87681b7c0 unwind: Implement generic sframe unwinder library
c8833ba50 unwind: add sframe v2 header
f3f3863cf arm64: entry: add unwind info for various kernel entries
57ab97f05 unwind: build kernel with sframe info
0da4b4b84 Linux 6.13.2
I have also fixed the 87681b7c0 ("unwind: Implement generic sframe
unwinder library")
with:
--- >8 ---
diff --git a/kernel/sframe_lookup.c b/kernel/sframe_lookup.c
index 846f1da95d89..28bec5064dc7 100644
--- a/kernel/sframe_lookup.c
+++ b/kernel/sframe_lookup.c
@@ -82,7 +82,7 @@ static struct sframe_fde *find_fde(const struct sframe_table
*tbl, unsigned long
if (f >= tbl->sfhdr_p->num_fdes || f < 0)
return NULL;
fdep = tbl->fde_p + f;
- if (ip < fdep->start_addr || ip >= fdep->start_addr + fdep->size)
+ if (ip < fdep->start_addr || ip > fdep->start_addr + fdep->size)
return NULL;
return fdep;
@@ -106,7 +106,7 @@ static int find_fre(const struct sframe_table *tbl,
unsigned long pc,
else
ip_off = (int32_t)(pc - (unsigned long)tbl->sfhdr_p) -
fdep->start_addr;
- if (ip_off < 0 || ip_off >= fdep->size)
+ if (ip_off < 0 || ip_off > fdep->size)
return -EINVAL;
/*
--- 8< ---
GCC is gcc (GCC) 11.4.1 20230605 (Red Hat 11.4.1-2)
kpatch is from https://github.com/puranjaymohan/kpatch/tree/arm64_wip
I run the with following:
./kpatch/kpatch-build/kpatch-build --non-replace -d -v \
linux-upstream/vmlinux -s linux-upstream/ -c linux-upstream/.config \
kpatch/test/integration/linux-6.2.0/special-static.patch
and my dmesg output is:
[ec2-user@ip-172-31-32-86 ~]$ sudo dmesg
[ 167.202596] livepatch_special_static: loading out-of-tree module taints
kernel.
[ 167.203217] livepatch_special_static: tainting kernel with TAINT_LIVEPATCH
[ 167.203760] livepatch_special_static: module verification failed: signature
and/or required key missing - tainting kernel
[ 167.205659] livepatch: enabling patch 'livepatch_special_static'
[ 167.207358] livepatch: 'livepatch_special_static': starting patching
transition
[ 168.264901] livepatch: 'livepatch_special_static': patching complete
[ 410.641806] livepatch: 'livepatch_special_static': starting unpatching
transition
[ 412.389369] livepatch: 'livepatch_special_static': unpatching complete
I even ran stress-ng with the livepatch loaded to see if something
happens.
P.S. - The livepatch doesn't have copy_process() but only copy_signal(),
yours had copy_process() somehow.
Here is the symbol table of the .ko
Symbol table '.symtab' contains 169 entries:
Num: Value Size Type Bind Vis Ndx Name
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4: 0000000000000000 0 SECTION LOCAL DEFAULT 5 .exit.text
5: 0000000000000000 0 SECTION LOCAL DEFAULT 7 .init.text
6: 0000000000000000 0 SECTION LOCAL DEFAULT 9 .text.copy_signal
7: 0000000000000000 0 SECTION LOCAL DEFAULT 11 .text.kpatch_foo
8: 0000000000000000 0 SECTION LOCAL DEFAULT 13 .altinstructions
9: 0000000000000000 0 SECTION LOCAL DEFAULT 15
__patchable_function_entries
10: 0000000000000000 0 SECTION LOCAL DEFAULT 17 .codetag.alloc_tags
11: 0000000000000000 0 SECTION LOCAL DEFAULT 18 .plt
12: 0000000000000000 0 SECTION LOCAL DEFAULT 19 .init.plt
13: 0000000000000000 0 SECTION LOCAL DEFAULT 20
.text.ftrace_trampoline
14: 0000000000000000 0 SECTION LOCAL DEFAULT 21 .rodata.str1.8
15: 0000000000000000 0 SECTION LOCAL DEFAULT 22 .modinfo
16: 0000000000000000 0 SECTION LOCAL DEFAULT 23 .sframe
17: 0000000000000000 0 SECTION LOCAL DEFAULT 25
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21: 0000000000000000 0 SECTION LOCAL DEFAULT 29
.rodata.__mmdrop.str1.8
22: 0000000000000000 0 SECTION LOCAL DEFAULT 30
.rodata.copy_signal.str1.8
23: 0000000000000000 0 SECTION LOCAL DEFAULT 31
.rodata.mm_init.str1.8
24: 0000000000000000 0 SECTION LOCAL DEFAULT 32
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25: 0000000000000000 0 SECTION LOCAL DEFAULT 33
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28: 0000000000000000 0 SECTION LOCAL DEFAULT 36
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29: 0000000000000000 0 SECTION LOCAL DEFAULT 37 .kpatch.strings
30: 0000000000000000 0 SECTION LOCAL DEFAULT 38 .kpatch.funcs
31: 0000000000000000 0 SECTION LOCAL DEFAULT 40 __versions
32: 0000000000000000 0 SECTION LOCAL DEFAULT 41 .bss
33: 0000000000000000 0 SECTION LOCAL DEFAULT 42 .bss.__key.4
34: 0000000000000000 0 SECTION LOCAL DEFAULT 43 .bss.__key.5
35: 0000000000000000 0 SECTION LOCAL DEFAULT 44 .bss.__key.6
36: 0000000000000000 0 SECTION LOCAL DEFAULT 45 .note.GNU-stack
37: 0000000000000000 0 SECTION LOCAL DEFAULT 46 .comment
38: 0000000000000000 0 SECTION LOCAL DEFAULT 47 .data
39: 0000000000000000 0 SECTION LOCAL DEFAULT 49 .exit.data
40: 0000000000000000 0 SECTION LOCAL DEFAULT 51 .init.data
41: 0000000000000000 0 SECTION LOCAL DEFAULT 53
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42: 0000000000000000 0 SECTION LOCAL DEFAULT 54
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43: 0000000000000000 0 SECTION LOCAL DEFAULT 55
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44: 0000000000000000 0 SECTION LOCAL DEFAULT 56
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45: 0000000000000000 0 SECTION LOCAL DEFAULT 57 .kpatch.force
46: 0000000000000000 0 SECTION LOCAL DEFAULT 58
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47: 0000000000000000 0 SECTION LOCAL DEFAULT 60 .debug_info
48: 0000000000000000 0 SECTION LOCAL DEFAULT 62 .debug_abbrev
49: 0000000000000000 0 SECTION LOCAL DEFAULT 63 .debug_loc
50: 0000000000000000 0 SECTION LOCAL DEFAULT 65 .debug_aranges
51: 0000000000000000 0 SECTION LOCAL DEFAULT 67 .debug_ranges
52: 0000000000000000 0 SECTION LOCAL DEFAULT 69 .debug_line
53: 0000000000000000 0 SECTION LOCAL DEFAULT 71 .debug_str
54: 0000000000000000 0 SECTION LOCAL DEFAULT 72 .debug_frame
55: 0000000000000000 0 FILE LOCAL DEFAULT ABS module-common.c
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57: 0000000000000000 0 NOTYPE LOCAL DEFAULT 2 $d
58: 0000000000000000 24 OBJECT LOCAL DEFAULT 2 _note_19
59: 0000000000000018 52 OBJECT LOCAL DEFAULT 2 _note_18
60: 0000000000000000 0 FILE LOCAL DEFAULT ABS patch-hook.c
61: 0000000000000000 0 NOTYPE LOCAL DEFAULT 3 $x
62: 0000000000000000 0 NOTYPE LOCAL DEFAULT 15 $d
63: 0000000000000008 104 FUNC LOCAL DEFAULT 3 patch_free_livepatch
64: 0000000000000000 0 NOTYPE LOCAL DEFAULT 5 $x
65: 0000000000000000 36 FUNC LOCAL DEFAULT 5 patch_exit
66: 0000000000000078 260 FUNC LOCAL DEFAULT 3 patch_free_scaffold
67: 0000000000000000 0 NOTYPE LOCAL DEFAULT 21 $d
68: 0000000000000188 280 FUNC LOCAL DEFAULT 3
patch_find_object_by_name
69: 00000000000002a8 432 FUNC LOCAL DEFAULT 3
add_callbacks_to_patch_objects
70: 0000000000000000 0 NOTYPE LOCAL DEFAULT 7 $x
71: 0000000000000008 584 FUNC LOCAL DEFAULT 7 patch_init
72: 0000000000000000 0 NOTYPE LOCAL DEFAULT 47 $d
73: 0000000000000000 16 OBJECT LOCAL DEFAULT 47 patch_objects
74: 0000000000000000 0 NOTYPE LOCAL DEFAULT 41 $d
75: 0000000000000000 8 OBJECT LOCAL DEFAULT 41 lpatch
76: 0000000000000008 4 OBJECT LOCAL DEFAULT 41 patch_objects_nr
77: 0000000000000000 0 NOTYPE LOCAL DEFAULT 49 $d
78: 0000000000000000 8 OBJECT LOCAL DEFAULT 49
__UNIQUE_ID___addressable_cleanup_module737
79: 0000000000000000 0 NOTYPE LOCAL DEFAULT 51 $d
80: 0000000000000000 8 OBJECT LOCAL DEFAULT 51
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81: 0000000000000000 12 OBJECT LOCAL DEFAULT 22
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82: 000000000000000c 12 OBJECT LOCAL DEFAULT 22
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83: 0000000000000000 0 FILE LOCAL DEFAULT ABS fork.c
84: 0000000000000008 496 FUNC LOCAL DEFAULT 9 copy_signal
85: 0000000000000000 0 NOTYPE LOCAL DEFAULT 25 $d
86: 0000000000000000 0 NOTYPE LOCAL DEFAULT 26 $d
87: 0000000000000000 0 NOTYPE LOCAL DEFAULT 27 $d
88: 0000000000000000 0 NOTYPE LOCAL DEFAULT 29 $d
89: 0000000000000000 0 NOTYPE LOCAL DEFAULT 30 $d
90: 0000000000000000 0 NOTYPE LOCAL DEFAULT 31 $d
91: 0000000000000000 0 NOTYPE LOCAL DEFAULT 32 $d
92: 0000000000000000 0 NOTYPE LOCAL DEFAULT 33 $d
93: 0000000000000128 0 NOTYPE LOCAL DEFAULT 21 $d
94: 0000000000000000 0 NOTYPE LOCAL DEFAULT 34 $d
95: 0000000000000000 0 NOTYPE LOCAL DEFAULT 35 $d
96: 0000000000000000 0 OBJECT LOCAL DEFAULT 42 __key.4
97: 0000000000000000 0 OBJECT LOCAL DEFAULT 43 __key.5
98: 0000000000000000 0 OBJECT LOCAL DEFAULT 44 __key.6
99: 0000000000000000 5 OBJECT LOCAL DEFAULT 36
str__task__trace_system_name
100: 0000000000000000 0 NOTYPE LOCAL DEFAULT 36 $d
101: 0000000000000000 0 NOTYPE LOCAL DEFAULT 28 .L14472^B1
102: 000000000000000e 0 NOTYPE LOCAL DEFAULT 28 .L14472^B2
103: 000000000000001c 0 NOTYPE LOCAL DEFAULT 28 .L14472^B3
104: 000000000000002a 0 NOTYPE LOCAL DEFAULT 28 .L14472^B4
105: 0000000000000038 0 NOTYPE LOCAL DEFAULT 28 .L14472^B5
106: 0000000000000046 0 NOTYPE LOCAL DEFAULT 28 .L14472^B6
107: 0000000000000054 0 NOTYPE LOCAL DEFAULT 28 .L14472^B7
108: 0000000000000062 0 NOTYPE LOCAL DEFAULT 28 .L14472^B8
109: 0000000000000070 0 NOTYPE LOCAL DEFAULT 28 .L14472^B9
110: 000000000000007e 0 NOTYPE LOCAL DEFAULT 28 .L14472^B10
111: 000000000000008c 0 NOTYPE LOCAL DEFAULT 28 .L14472^B11
112: 00000000000000a9 0 NOTYPE LOCAL DEFAULT 28 .L14472^B12
113: 00000000000000c1 0 NOTYPE LOCAL DEFAULT 28 .L14472^B13
114: 00000000000000d9 0 NOTYPE LOCAL DEFAULT 28 .L14472^B14
115: 00000000000000f1 0 NOTYPE LOCAL DEFAULT 28 .L14472^B15
116: 0000000000000109 0 NOTYPE LOCAL DEFAULT 28 .L14472^B16
117: 0000000000000124 0 NOTYPE LOCAL DEFAULT 28 .L14472^B17
118: 0000000000000132 0 NOTYPE LOCAL DEFAULT 28 .L14472^B18
119: 000000000000014d 0 NOTYPE LOCAL DEFAULT 28 .L14472^B19
120: 0000000000000168 0 NOTYPE LOCAL DEFAULT 28 .L14472^B20
121: 0000000000000000 0 FILE LOCAL DEFAULT ABS
livepatch-special-static.mod.c
122: 0000000000000000 0 NOTYPE LOCAL DEFAULT 58 $d
123: 0000000000000018 35 OBJECT LOCAL DEFAULT 22
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124: 000000000000003b 9 OBJECT LOCAL DEFAULT 22
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125: 0000000000000044 30 OBJECT LOCAL DEFAULT 22 __UNIQUE_ID_name547
126: 0000000000000000 0 NOTYPE LOCAL DEFAULT 40 $d
127: 0000000000000000 0 OBJECT LOCAL DEFAULT OS [0xff20]
.klp.sym.vmlinux.signal_cachep,1
128: 0000000000000000 1216 OBJECT LOCAL DEFAULT 40 ____versions
129: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 55
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130: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND __init_rwsem
131: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND
__list_add_valid_or_report
132: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND __kmalloc_noprof
133: 0000000000000000 1344 OBJECT GLOBAL DEFAULT 58 __this_module
134: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 54
__kpatch_callbacks_post_patch
135: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 57 __kpatch_force_funcs
136: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 17 __stop_alloc_tags
137: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND hrtimer_init
138: 0000000000000000 36 FUNC GLOBAL DEFAULT 5 cleanup_module
139: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND memcpy
140: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND klp_enable_patch
141: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND kfree
142: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 53
__kpatch_callbacks_pre_patch
143: 0000000000000008 584 FUNC GLOBAL DEFAULT 7 init_module
144: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 55
__kpatch_callbacks_pre_unpatch
145: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 17 __start_alloc_tags
146: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 38 __kpatch_funcs
147: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND _printk
148: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 57
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149: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND
queued_spin_lock_slowpath
150: 0000000000000038 0 NOTYPE GLOBAL DEFAULT 38 __kpatch_funcs_end
151: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 54
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152: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 53
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153: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND
__list_del_entry_valid_or_report
154: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND __mutex_init
155: 0000000000000008 60 FUNC GLOBAL DEFAULT 11 kpatch_foo
156: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 56
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157: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND
kmem_cache_alloc_noprof
158: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND __init_waitqueue_head
159: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND strcmp
160: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND jiffies
161: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 56
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162: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND
__kmalloc_cache_noprof
163: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND alt_cb_patch_nops
164: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND kmalloc_caches
165: 0000000000000000 0 NOTYPE GLOBAL DEFAULT OS [0xff20]
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166: 0000000000000000 0 NOTYPE GLOBAL DEFAULT OS [0xff20]
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167: 0000000000000000 0 NOTYPE GLOBAL DEFAULT OS [0xff20]
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168: 0000000000000000 0 NOTYPE GLOBAL DEFAULT OS [0xff20]
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and Sections:
[ec2-user@ip-172-31-32-86 ~]$ readelf -WS livepatch-special-static.ko
There are 78 section headers, starting at offset 0x1727d8:
Section Headers:
[Nr] Name Type Address Off Size ES Flg
Lk Inf Al
[ 0] NULL 0000000000000000 000000 000000 00
0 0 0
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[ 2] .note.Linux NOTE 0000000000000000 000064 00004c 00 A
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[ 3] .text PROGBITS 0000000000000000 0000c0 000458 00 AX
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[ 9] .text.copy_signal PROGBITS 0000000000000000 001098 0001f8 00 AX
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[20] .text.ftrace_trampoline PROGBITS 0000000000000000 0016b2 000001
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[75] .strtab STRTAB 0000000000000000 171ae8 0006cc 00
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[76] .shstrtab STRTAB 0000000000000000 1721b4 000576 00
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[77] .klp.rela.vmlinux..text.copy_signal RELA 0000000000000000 172730 0000a8
18 AIo 74 9 8
Thanks,
Puranjay
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Description: PGP signature
