Comments (2)
jstancek
commented on June 21, 2024
Here is simpler reproducer, with base kernel containing kernel/test3.c with content:
#include <linux/init.h>
#include <linux/export.h>
static int dummy;
void test_function30(void)
{
dummy = 1;
}
void test_function31(void)
{
dummy = 2;
}
EXPORT_SYMBOL(test_function30);
EXPORT_SYMBOL(test_function31);and kpatch patch:
diff --git a/kernel/test3.c b/kernel/test3.c
index 50d3c86..91a43a1 100644
--- a/kernel/test3.c
+++ b/kernel/test3.c
@@ -5,7 +5,9 @@ static int dummy;
void test_function30(void)
{
- dummy = 1;
+ int i;
+ for (i = 0; i < 10; i++)
+ dummy += i;
}
void test_function31(void)# /usr/local/libexec/kpatch/create-diff-object orig/kernel/test3.o patched/kernel/test3.o /root/vmlinux output/kernel/test3.o
=== section list (22) ===
ndx 01, type: 1, data (nil), size 0, name .text
ndx 02, type: 1, data 0x7fd4e9fff040, size 21, name .text.test_function30
ndx 03, type: 4, data 0x7fd4e9fffb88, size 48, name .rela.text.test_function30
ndx 04, type: 1, data 0x7fd4e9fff060, size 21, name .text.test_function31
ndx 05, type: 4, data 0x7fd4e9fffbb8, size 48, name .rela.text.test_function31
ndx 06, type: 1, data 0x7fd4e9fff080, size 16, name ___ksymtab+test_function31
ndx 07, type: 4, data 0x7fd4e9fffbe8, size 48, name .rela___ksymtab+test_function31
ndx 08, type: 1, data 0x7fd4e9fff090, size 32, name __ksymtab_strings
ndx 09, type: 1, data 0x7fd4e9fff0b0, size 8, name ___kcrctab+test_function31
ndx 10, type: 4, data 0x7fd4e9fffc18, size 24, name .rela___kcrctab+test_function31
ndx 11, type: 1, data 0x7fd4e9fff0c0, size 16, name ___ksymtab+test_function30
ndx 12, type: 4, data 0x7fd4e9fffc30, size 48, name .rela___ksymtab+test_function30
ndx 13, type: 1, data 0x7fd4e9fff0d0, size 8, name ___kcrctab+test_function30
ndx 14, type: 4, data 0x7fd4e9fffc60, size 24, name .rela___kcrctab+test_function30
ndx 15, type: 1, data (nil), size 0, name .data
ndx 16, type: 8, data (nil), size 0, name .bss
ndx 17, type: 8, data (nil), size 4, name .bss.dummy
ndx 18, type: 1, data 0x7fd4e9fff0d8, size 46, name .comment
ndx 19, type: 1, data (nil), size 0, name .note.GNU-stack
ndx 20, type: 3, data 0x7fd4e9fff106, size 280, name .shstrtab
ndx 21, type: 2, data 0x7fd4e9fff7e0, size 672, name .symtab
ndx 22, type: 3, data 0x7fd4e9fffa80, size 258, name .strtab
=== symbol list (28 entries) ===
sym 00, type 0, bind 0, ndx 00, name
sym 01, type 3, bind 0, ndx 08, name __ksymtab_strings -> __ksymtab_strings
sym 02, type 3, bind 0, ndx 17, name .bss.dummy -> .bss.dummy
sym 03, type 4, bind 0, ndx 65521, name test3.c
sym 04, type 1, bind 0, ndx 17, name dummy -> .bss.dummy
sym 05, type 1, bind 0, ndx 06, name __ksymtab_test_function31 -> ___ksymtab+test_function31
sym 06, type 1, bind 0, ndx 08, name __kstrtab_test_function31 -> __ksymtab_strings
sym 07, type 1, bind 0, ndx 09, name __kcrctab_test_function31 -> ___kcrctab+test_function31
sym 08, type 1, bind 0, ndx 11, name __ksymtab_test_function30 -> ___ksymtab+test_function30
sym 09, type 1, bind 0, ndx 08, name __kstrtab_test_function30 -> __ksymtab_strings
sym 10, type 1, bind 0, ndx 13, name __kcrctab_test_function30 -> ___kcrctab+test_function30
sym 11, type 4, bind 0, ndx 65521, name
sym 12, type 3, bind 0, ndx 01, name .text -> .text
sym 13, type 3, bind 0, ndx 02, name .text.test_function30 -> .text.test_function30
sym 14, type 3, bind 0, ndx 04, name .text.test_function31 -> .text.test_function31
sym 15, type 3, bind 0, ndx 06, name ___ksymtab+test_function31 -> ___ksymtab+test_function31
sym 16, type 3, bind 0, ndx 09, name ___kcrctab+test_function31 -> ___kcrctab+test_function31
sym 17, type 3, bind 0, ndx 11, name ___ksymtab+test_function30 -> ___ksymtab+test_function30
sym 18, type 3, bind 0, ndx 13, name ___kcrctab+test_function30 -> ___kcrctab+test_function30
sym 19, type 3, bind 0, ndx 15, name .data -> .data
sym 20, type 3, bind 0, ndx 16, name .bss -> .bss
sym 21, type 3, bind 0, ndx 18, name .comment -> .comment
sym 22, type 3, bind 0, ndx 19, name .note.GNU-stack -> .note.GNU-stack
sym 23, type 2, bind 1, ndx 04, name test_function31 -> .text.test_function31
sym 24, type 0, bind 1, ndx 65521, name __crc_test_function30
sym 25, type 0, bind 1, ndx 00, name __fentry__
sym 26, type 0, bind 1, ndx 65521, name __crc_test_function31
sym 27, type 2, bind 1, ndx 02, name test_function30 -> .text.test_function30
=== rela list for .text.test_function30 (2 entries) ===
offset 1, type 0, __fentry__ - 4
offset 8, type 2, .bss.dummy - 8
=== rela list for .text.test_function31 (2 entries) ===
offset 1, type 0, __fentry__ - 4
offset 8, type 2, .bss.dummy - 8
=== rela list for ___ksymtab+test_function31 (2 entries) ===
offset 0, type 1, test_function31 + 0
offset 8, type 1, __ksymtab_strings + 0
=== rela list for ___kcrctab+test_function31 (1 entries) ===
offset 0, type 1, __crc_test_function31 + 0
=== rela list for ___ksymtab+test_function30 (2 entries) ===
offset 0, type 1, test_function30 + 0
offset 8, type 1, __ksymtab_strings + 16
=== rela list for ___kcrctab+test_function30 (1 entries) ===
offset 0, type 1, __crc_test_function30 + 0
=== section list (22) ===
ndx 01, type: 1, data (nil), size 0, name .text
ndx 02, type: 1, data 0x7fd4e9ffd040, size 42, name .text.test_function30
ndx 03, type: 4, data 0x7fd4e9ffdb98, size 72, name .rela.text.test_function30
ndx 04, type: 1, data 0x7fd4e9ffd070, size 21, name .text.test_function31
ndx 05, type: 4, data 0x7fd4e9ffdbe0, size 48, name .rela.text.test_function31
ndx 06, type: 1, data 0x7fd4e9ffd090, size 16, name ___ksymtab+test_function31
ndx 07, type: 4, data 0x7fd4e9ffdc10, size 48, name .rela___ksymtab+test_function31
ndx 08, type: 1, data 0x7fd4e9ffd0a0, size 32, name __ksymtab_strings
ndx 09, type: 1, data 0x7fd4e9ffd0c0, size 8, name ___kcrctab+test_function31
ndx 10, type: 4, data 0x7fd4e9ffdc40, size 24, name .rela___kcrctab+test_function31
ndx 11, type: 1, data 0x7fd4e9ffd0d0, size 16, name ___ksymtab+test_function30
ndx 12, type: 4, data 0x7fd4e9ffdc58, size 48, name .rela___ksymtab+test_function30
ndx 13, type: 1, data 0x7fd4e9ffd0e0, size 8, name ___kcrctab+test_function30
ndx 14, type: 4, data 0x7fd4e9ffdc88, size 24, name .rela___kcrctab+test_function30
ndx 15, type: 1, data (nil), size 0, name .data
ndx 16, type: 8, data (nil), size 0, name .bss
ndx 17, type: 8, data (nil), size 4, name .bss.dummy
ndx 18, type: 1, data 0x7fd4e9ffd0e8, size 46, name .comment
ndx 19, type: 1, data (nil), size 0, name .note.GNU-stack
ndx 20, type: 3, data 0x7fd4e9ffd116, size 280, name .shstrtab
ndx 21, type: 2, data 0x7fd4e9ffd7f0, size 672, name .symtab
ndx 22, type: 3, data 0x7fd4e9ffda90, size 258, name .strtab
=== symbol list (28 entries) ===
sym 00, type 0, bind 0, ndx 00, name
sym 01, type 3, bind 0, ndx 08, name __ksymtab_strings -> __ksymtab_strings
sym 02, type 3, bind 0, ndx 17, name .bss.dummy -> .bss.dummy
sym 03, type 4, bind 0, ndx 65521, name test3.c
sym 04, type 1, bind 0, ndx 17, name dummy -> .bss.dummy
sym 05, type 1, bind 0, ndx 06, name __ksymtab_test_function31 -> ___ksymtab+test_function31
sym 06, type 1, bind 0, ndx 08, name __kstrtab_test_function31 -> __ksymtab_strings
sym 07, type 1, bind 0, ndx 09, name __kcrctab_test_function31 -> ___kcrctab+test_function31
sym 08, type 1, bind 0, ndx 11, name __ksymtab_test_function30 -> ___ksymtab+test_function30
sym 09, type 1, bind 0, ndx 08, name __kstrtab_test_function30 -> __ksymtab_strings
sym 10, type 1, bind 0, ndx 13, name __kcrctab_test_function30 -> ___kcrctab+test_function30
sym 11, type 4, bind 0, ndx 65521, name
sym 12, type 3, bind 0, ndx 01, name .text -> .text
sym 13, type 3, bind 0, ndx 02, name .text.test_function30 -> .text.test_function30
sym 14, type 3, bind 0, ndx 04, name .text.test_function31 -> .text.test_function31
sym 15, type 3, bind 0, ndx 06, name ___ksymtab+test_function31 -> ___ksymtab+test_function31
sym 16, type 3, bind 0, ndx 09, name ___kcrctab+test_function31 -> ___kcrctab+test_function31
sym 17, type 3, bind 0, ndx 11, name ___ksymtab+test_function30 -> ___ksymtab+test_function30
sym 18, type 3, bind 0, ndx 13, name ___kcrctab+test_function30 -> ___kcrctab+test_function30
sym 19, type 3, bind 0, ndx 15, name .data -> .data
sym 20, type 3, bind 0, ndx 16, name .bss -> .bss
sym 21, type 3, bind 0, ndx 18, name .comment -> .comment
sym 22, type 3, bind 0, ndx 19, name .note.GNU-stack -> .note.GNU-stack
sym 23, type 2, bind 1, ndx 04, name test_function31 -> .text.test_function31
sym 24, type 0, bind 1, ndx 65521, name __crc_test_function30
sym 25, type 0, bind 1, ndx 00, name __fentry__
sym 26, type 0, bind 1, ndx 65521, name __crc_test_function31
sym 27, type 2, bind 1, ndx 02, name test_function30 -> .text.test_function30
=== rela list for .text.test_function30 (3 entries) ===
offset 1, type 0, __fentry__ - 4
offset 7, type 2, .bss.dummy - 4
offset 36, type 2, .bss.dummy - 4
=== rela list for .text.test_function31 (2 entries) ===
offset 1, type 0, __fentry__ - 4
offset 8, type 2, .bss.dummy - 8
=== rela list for ___ksymtab+test_function31 (2 entries) ===
offset 0, type 1, test_function31 + 0
offset 8, type 1, __ksymtab_strings + 0
=== rela list for ___kcrctab+test_function31 (1 entries) ===
offset 0, type 1, __crc_test_function31 + 0
=== rela list for ___ksymtab+test_function30 (2 entries) ===
offset 0, type 1, test_function30 + 0
offset 8, type 1, __ksymtab_strings + 16
=== rela list for ___kcrctab+test_function30 (1 entries) ===
offset 0, type 1, __crc_test_function30 + 0
section .text.test_function30 has changed
section .rela.text.test_function30 has changed
section .symtab has changed
test3.o: symbol info mismatch:
/usr/local/libexec/kpatch/create-diff-object: unreconcilable difference
from kpatch.
sjenning
commented on June 21, 2024
I can't recreate the "symbol info mismatch" issue with the latest master 6aee215. I do get the:
signal.o: signal.o: changed section .rela__jump_table not selected for inclusion
signal.o: 1 unsupported section change(s)
which is being track in issue #157. Can you confirm?
from kpatch.
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