* [PATCH] backends: add checks for _GLOBAL_OFFSET_TABLE_ on loongarch
@ 2023-04-01 3:18 Youling Tang
2023-04-04 15:45 ` Hengqi Chen
2023-04-06 22:52 ` Mark Wielaard
0 siblings, 2 replies; 4+ messages in thread
From: Youling Tang @ 2023-04-01 3:18 UTC (permalink / raw)
To: elfutils-devel; +Cc: Hengqi Chen, Liwei Ge
Add handling of _GLOBAL_OFFSET_TABLE_.
Before applying the patch:
$ ./src/elflint --gnu-ld ./src/elflint
section [35] '.symtab': _GLOBAL_OFFSET_TABLE_ symbol value 0x68548
does not match .got.plt section address 0x68238
After applying the patch:
$ ./src/elflint --gnu-ld ./src/elflint
No errors
Signed-off-by: Liwei Ge <geliwei@openanolis.org>
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
---
backends/ChangeLog | 4 ++++
backends/loongarch_init.c | 1 +
backends/loongarch_symbol.c | 35 +++++++++++++++++++++++++++++++++++
3 files changed, 40 insertions(+)
diff --git a/backends/ChangeLog b/backends/ChangeLog
index 81f08314..41071953 100644
--- a/backends/ChangeLog
+++ b/backends/ChangeLog
@@ -1,3 +1,7 @@
+2023-04-01 Youling Tang <tangyouling@loongson.cn>
+ * loongarch_init.c (loongarch_init): Hook check_special_symbol.
+ * loongarch_symbol.c (loongarch_check_special_symbol): New function.
+
2023-02-07 Mark Wielaard <mark@klomp.org>
* libebl_CPU.h (dwarf_peeled_die_type): Explicitly handle
diff --git a/backends/loongarch_init.c b/backends/loongarch_init.c
index 59d8cc3d..b641b07f 100644
--- a/backends/loongarch_init.c
+++ b/backends/loongarch_init.c
@@ -46,6 +46,7 @@ loongarch_init (Elf *elf __attribute__ ((unused)),
loongarch_init_reloc (eh);
HOOK (eh, reloc_simple_type);
HOOK (eh, machine_flag_check);
+ HOOK (eh, check_special_symbol);
return eh;
}
diff --git a/backends/loongarch_symbol.c b/backends/loongarch_symbol.c
index 43306ab8..5ce55bad 100644
--- a/backends/loongarch_symbol.c
+++ b/backends/loongarch_symbol.c
@@ -79,3 +79,38 @@ loongarch_machine_flag_check (GElf_Word flags)
return ((flags &~ (EF_LARCH_ABI_MODIFIER_MASK
| EF_LARCH_OBJABI_V1)) == 0);
}
+
+/* Check whether given symbol's st_value and st_size are OK despite failing
+ normal checks. */
+bool
+loongarch_check_special_symbol (Elf *elf, const GElf_Sym *sym,
+ const char *name, const GElf_Shdr *destshdr)
+{
+ if (name != NULL
+ && strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0)
+ {
+ size_t shstrndx;
+ if (elf_getshdrstrndx (elf, &shstrndx) != 0)
+ return false;
+ const char *sname = elf_strptr (elf, shstrndx, destshdr->sh_name);
+ if (sname != NULL
+ && (strcmp (sname, ".got") == 0 || strcmp (sname, ".got.plt") == 0))
+ {
+ Elf_Scn *scn = NULL;
+ while ((scn = elf_nextscn (elf, scn)) != NULL)
+ {
+ GElf_Shdr shdr_mem;
+ GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
+ if (shdr != NULL)
+ {
+ sname = elf_strptr (elf, shstrndx, shdr->sh_name);
+ if (sname != NULL && strcmp (sname, ".got") == 0)
+ return (sym->st_value >= shdr->sh_addr
+ && sym->st_value < shdr->sh_addr + shdr->sh_size);
+ }
+ }
+ }
+ }
+
+ return false;
+}
--
2.37.1
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] backends: add checks for _GLOBAL_OFFSET_TABLE_ on loongarch
2023-04-01 3:18 [PATCH] backends: add checks for _GLOBAL_OFFSET_TABLE_ on loongarch Youling Tang
@ 2023-04-04 15:45 ` Hengqi Chen
2023-04-06 1:59 ` Youling Tang
2023-04-06 22:52 ` Mark Wielaard
1 sibling, 1 reply; 4+ messages in thread
From: Hengqi Chen @ 2023-04-04 15:45 UTC (permalink / raw)
To: Youling Tang; +Cc: elfutils-devel, Liwei Ge
Hi, Youling
On Sat, Apr 1, 2023 at 11:19 AM Youling Tang <tangyouling@loongson.cn> wrote:
>
> Add handling of _GLOBAL_OFFSET_TABLE_.
>
> Before applying the patch:
> $ ./src/elflint --gnu-ld ./src/elflint
> section [35] '.symtab': _GLOBAL_OFFSET_TABLE_ symbol value 0x68548
> does not match .got.plt section address 0x68238
>
> After applying the patch:
> $ ./src/elflint --gnu-ld ./src/elflint
> No errors
>
> Signed-off-by: Liwei Ge <geliwei@openanolis.org>
> Signed-off-by: Youling Tang <tangyouling@loongson.cn>
> ---
> backends/ChangeLog | 4 ++++
> backends/loongarch_init.c | 1 +
> backends/loongarch_symbol.c | 35 +++++++++++++++++++++++++++++++++++
> 3 files changed, 40 insertions(+)
>
> diff --git a/backends/ChangeLog b/backends/ChangeLog
> index 81f08314..41071953 100644
> --- a/backends/ChangeLog
> +++ b/backends/ChangeLog
> @@ -1,3 +1,7 @@
> +2023-04-01 Youling Tang <tangyouling@loongson.cn>
> + * loongarch_init.c (loongarch_init): Hook check_special_symbol.
> + * loongarch_symbol.c (loongarch_check_special_symbol): New function.
> +
> 2023-02-07 Mark Wielaard <mark@klomp.org>
>
> * libebl_CPU.h (dwarf_peeled_die_type): Explicitly handle
> diff --git a/backends/loongarch_init.c b/backends/loongarch_init.c
> index 59d8cc3d..b641b07f 100644
> --- a/backends/loongarch_init.c
> +++ b/backends/loongarch_init.c
> @@ -46,6 +46,7 @@ loongarch_init (Elf *elf __attribute__ ((unused)),
> loongarch_init_reloc (eh);
> HOOK (eh, reloc_simple_type);
> HOOK (eh, machine_flag_check);
> + HOOK (eh, check_special_symbol);
>
> return eh;
> }
> diff --git a/backends/loongarch_symbol.c b/backends/loongarch_symbol.c
> index 43306ab8..5ce55bad 100644
> --- a/backends/loongarch_symbol.c
> +++ b/backends/loongarch_symbol.c
> @@ -79,3 +79,38 @@ loongarch_machine_flag_check (GElf_Word flags)
> return ((flags &~ (EF_LARCH_ABI_MODIFIER_MASK
> | EF_LARCH_OBJABI_V1)) == 0);
> }
> +
> +/* Check whether given symbol's st_value and st_size are OK despite failing
> + normal checks. */
> +bool
> +loongarch_check_special_symbol (Elf *elf, const GElf_Sym *sym,
> + const char *name, const GElf_Shdr *destshdr)
> +{
> + if (name != NULL
> + && strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0)
> + {
> + size_t shstrndx;
> + if (elf_getshdrstrndx (elf, &shstrndx) != 0)
> + return false;
> + const char *sname = elf_strptr (elf, shstrndx, destshdr->sh_name);
> + if (sname != NULL
> + && (strcmp (sname, ".got") == 0 || strcmp (sname, ".got.plt") == 0))
> + {
> + Elf_Scn *scn = NULL;
> + while ((scn = elf_nextscn (elf, scn)) != NULL)
> + {
> + GElf_Shdr shdr_mem;
> + GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
> + if (shdr != NULL)
> + {
> + sname = elf_strptr (elf, shstrndx, shdr->sh_name);
> + if (sname != NULL && strcmp (sname, ".got") == 0)
> + return (sym->st_value >= shdr->sh_addr
> + && sym->st_value < shdr->sh_addr + shdr->sh_size);
> + }
> + }
> + }
> + }
> +
> + return false;
> +}
> --
> 2.37.1
>
I've tested this locally, but still remains one error:
section [34] '.symtab': _DYNAMIC symbol size 0 does not match dynamic
segment size 480
Cheers,
---
Hengqi
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] backends: add checks for _GLOBAL_OFFSET_TABLE_ on loongarch
2023-04-04 15:45 ` Hengqi Chen
@ 2023-04-06 1:59 ` Youling Tang
0 siblings, 0 replies; 4+ messages in thread
From: Youling Tang @ 2023-04-06 1:59 UTC (permalink / raw)
To: Hengqi Chen; +Cc: elfutils-devel, Liwei Ge
Hi, Hengqi
On 04/04/2023 11:45 PM, Hengqi Chen wrote:
> Hi, Youling
>
> On Sat, Apr 1, 2023 at 11:19 AM Youling Tang <tangyouling@loongson.cn> wrote:
>>
>> Add handling of _GLOBAL_OFFSET_TABLE_.
>>
>> Before applying the patch:
>> $ ./src/elflint --gnu-ld ./src/elflint
>> section [35] '.symtab': _GLOBAL_OFFSET_TABLE_ symbol value 0x68548
>> does not match .got.plt section address 0x68238
>>
>> After applying the patch:
>> $ ./src/elflint --gnu-ld ./src/elflint
>> No errors
>>
>> Signed-off-by: Liwei Ge <geliwei@openanolis.org>
>> Signed-off-by: Youling Tang <tangyouling@loongson.cn>
>> ---
>> backends/ChangeLog | 4 ++++
>> backends/loongarch_init.c | 1 +
>> backends/loongarch_symbol.c | 35 +++++++++++++++++++++++++++++++++++
>> 3 files changed, 40 insertions(+)
>>
>> diff --git a/backends/ChangeLog b/backends/ChangeLog
>> index 81f08314..41071953 100644
>> --- a/backends/ChangeLog
>> +++ b/backends/ChangeLog
>> @@ -1,3 +1,7 @@
>> +2023-04-01 Youling Tang <tangyouling@loongson.cn>
>> + * loongarch_init.c (loongarch_init): Hook check_special_symbol.
>> + * loongarch_symbol.c (loongarch_check_special_symbol): New function.
>> +
>> 2023-02-07 Mark Wielaard <mark@klomp.org>
>>
>> * libebl_CPU.h (dwarf_peeled_die_type): Explicitly handle
>> diff --git a/backends/loongarch_init.c b/backends/loongarch_init.c
>> index 59d8cc3d..b641b07f 100644
>> --- a/backends/loongarch_init.c
>> +++ b/backends/loongarch_init.c
>> @@ -46,6 +46,7 @@ loongarch_init (Elf *elf __attribute__ ((unused)),
>> loongarch_init_reloc (eh);
>> HOOK (eh, reloc_simple_type);
>> HOOK (eh, machine_flag_check);
>> + HOOK (eh, check_special_symbol);
>>
>> return eh;
>> }
>> diff --git a/backends/loongarch_symbol.c b/backends/loongarch_symbol.c
>> index 43306ab8..5ce55bad 100644
>> --- a/backends/loongarch_symbol.c
>> +++ b/backends/loongarch_symbol.c
>> @@ -79,3 +79,38 @@ loongarch_machine_flag_check (GElf_Word flags)
>> return ((flags &~ (EF_LARCH_ABI_MODIFIER_MASK
>> | EF_LARCH_OBJABI_V1)) == 0);
>> }
>> +
>> +/* Check whether given symbol's st_value and st_size are OK despite failing
>> + normal checks. */
>> +bool
>> +loongarch_check_special_symbol (Elf *elf, const GElf_Sym *sym,
>> + const char *name, const GElf_Shdr *destshdr)
>> +{
>> + if (name != NULL
>> + && strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0)
>> + {
>> + size_t shstrndx;
>> + if (elf_getshdrstrndx (elf, &shstrndx) != 0)
>> + return false;
>> + const char *sname = elf_strptr (elf, shstrndx, destshdr->sh_name);
>> + if (sname != NULL
>> + && (strcmp (sname, ".got") == 0 || strcmp (sname, ".got.plt") == 0))
>> + {
>> + Elf_Scn *scn = NULL;
>> + while ((scn = elf_nextscn (elf, scn)) != NULL)
>> + {
>> + GElf_Shdr shdr_mem;
>> + GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
>> + if (shdr != NULL)
>> + {
>> + sname = elf_strptr (elf, shstrndx, shdr->sh_name);
>> + if (sname != NULL && strcmp (sname, ".got") == 0)
>> + return (sym->st_value >= shdr->sh_addr
>> + && sym->st_value < shdr->sh_addr + shdr->sh_size);
>> + }
>> + }
>> + }
>> + }
>> +
>> + return false;
>> +}
>> --
>> 2.37.1
>>
>
> I've tested this locally, but still remains one error:
> section [34] '.symtab': _DYNAMIC symbol size 0 does not match dynamic
> segment size 480
The problem should be independent of this patch, but I can't reproduce
it.
- Test Environment 1: Old Toolchain:
$ cat /etc/os-release
NAME="My GNU/Linux System for LoongArch64"
VERSION="5.0"
ID=CLFS4LA64
PRETTY_NAME="My GNU/Linux System for LoongArch64 5.0"
$ gcc -v
gcc version 12.1.0 (GCC)
$ ./src/elflint --gnu-ld ./src/elflint
No errors
- Test Environment 2: New Toolchain:
$ cat /etc/os-release
NAME="My GNU/Linux System for LoongArch64"
VERSION="6.0"
ID=CLFS4LA64
PRETTY_NAME="My GNU/Linux System for LoongArch64 6.0"
$ gcc -v
gcc version 13.0.0 20220919 (experimental) (GCC)
$ ./src/elflint --gnu-ld ./src/elflint
No errors
Can you provide your test environment, or help debug the possible
causes of the problem?
Thanks,
Youling.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] backends: add checks for _GLOBAL_OFFSET_TABLE_ on loongarch
2023-04-01 3:18 [PATCH] backends: add checks for _GLOBAL_OFFSET_TABLE_ on loongarch Youling Tang
2023-04-04 15:45 ` Hengqi Chen
@ 2023-04-06 22:52 ` Mark Wielaard
1 sibling, 0 replies; 4+ messages in thread
From: Mark Wielaard @ 2023-04-06 22:52 UTC (permalink / raw)
To: Youling Tang; +Cc: elfutils-devel, Hengqi Chen, Liwei Ge
Hi,
On Sat, Apr 01, 2023 at 11:18:53AM +0800, Youling Tang wrote:
> Add handling of _GLOBAL_OFFSET_TABLE_.
>
> Before applying the patch:
> $ ./src/elflint --gnu-ld ./src/elflint
> section [35] '.symtab': _GLOBAL_OFFSET_TABLE_ symbol value 0x68548
> does not match .got.plt section address 0x68238
>
> After applying the patch:
> $ ./src/elflint --gnu-ld ./src/elflint
> No errors
Thanks, code looks correct. I agree that the other issue mentioned
(_DYNAMIC symbol size 0) is a separate issue.
Pushed,
Mark
^ permalink raw reply [flat|nested] 4+ messages in thread
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2023-04-01 3:18 [PATCH] backends: add checks for _GLOBAL_OFFSET_TABLE_ on loongarch Youling Tang
2023-04-04 15:45 ` Hengqi Chen
2023-04-06 1:59 ` Youling Tang
2023-04-06 22:52 ` Mark Wielaard
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