diff mbox series

[02/13] kallsyms: Increase maximum kernel symbol length to 512

Message ID 20210414184604.23473-3-ojeda@kernel.org (mailing list archive)
State New
Headers show
Series Rust support | expand

Commit Message

ojeda@kernel.org April 14, 2021, 6:45 p.m. UTC
From: Miguel Ojeda <ojeda@kernel.org>

Rust symbols can become quite long due to namespacing introduced
by modules, types, traits, generics, etc. For instance, for:

    pub mod my_module {
        pub struct MyType;
        pub struct MyGenericType<T>(T);

        pub trait MyTrait {
            fn my_method() -> u32;
        }

        impl MyTrait for MyGenericType<MyType> {
            fn my_method() -> u32 {
                42
            }
        }
    }

generates a symbol of length 96 when using the upcoming v0 mangling scheme:

    _RNvXNtCshGpAVYOtgW1_7example9my_moduleINtB2_13MyGenericTypeNtB2_6MyTypeENtB2_7MyTrait9my_method

At the moment, Rust symbols may reach up to 300 in length.
Setting 512 as the maximum seems like a reasonable choice to
keep some headroom.

Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com>
Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com>
Co-developed-by: Geoffrey Thomas <geofft@ldpreload.com>
Signed-off-by: Geoffrey Thomas <geofft@ldpreload.com>
Co-developed-by: Finn Behrens <me@kloenk.de>
Signed-off-by: Finn Behrens <me@kloenk.de>
Co-developed-by: Adam Bratschi-Kaye <ark.email@gmail.com>
Signed-off-by: Adam Bratschi-Kaye <ark.email@gmail.com>
Co-developed-by: Wedson Almeida Filho <wedsonaf@google.com>
Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
 include/linux/kallsyms.h            | 2 +-
 kernel/livepatch/core.c             | 4 ++--
 scripts/kallsyms.c                  | 2 +-
 tools/include/linux/kallsyms.h      | 2 +-
 tools/include/linux/lockdep.h       | 2 +-
 tools/lib/perf/include/perf/event.h | 2 +-
 tools/lib/symbol/kallsyms.h         | 2 +-
 7 files changed, 8 insertions(+), 8 deletions(-)

Comments

Nick Desaulniers April 14, 2021, 11:48 p.m. UTC | #1
On Wed, Apr 14, 2021 at 11:48 AM <ojeda@kernel.org> wrote:
>
> From: Miguel Ojeda <ojeda@kernel.org>
>
> Rust symbols can become quite long due to namespacing introduced
> by modules, types, traits, generics, etc. For instance, for:
>
>     pub mod my_module {
>         pub struct MyType;
>         pub struct MyGenericType<T>(T);
>
>         pub trait MyTrait {
>             fn my_method() -> u32;
>         }
>
>         impl MyTrait for MyGenericType<MyType> {
>             fn my_method() -> u32 {
>                 42
>             }
>         }
>     }
>
> generates a symbol of length 96 when using the upcoming v0 mangling scheme:
>
>     _RNvXNtCshGpAVYOtgW1_7example9my_moduleINtB2_13MyGenericTypeNtB2_6MyTypeENtB2_7MyTrait9my_method
>
> At the moment, Rust symbols may reach up to 300 in length.
> Setting 512 as the maximum seems like a reasonable choice to
> keep some headroom.

What are the implications of this change for someone not using Rust?
Does it change the binary size of vmlinux for a defconfig build, for
example?

>
> Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com>
> Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com>
> Co-developed-by: Geoffrey Thomas <geofft@ldpreload.com>
> Signed-off-by: Geoffrey Thomas <geofft@ldpreload.com>
> Co-developed-by: Finn Behrens <me@kloenk.de>
> Signed-off-by: Finn Behrens <me@kloenk.de>
> Co-developed-by: Adam Bratschi-Kaye <ark.email@gmail.com>
> Signed-off-by: Adam Bratschi-Kaye <ark.email@gmail.com>
> Co-developed-by: Wedson Almeida Filho <wedsonaf@google.com>
> Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com>
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
> ---
>  include/linux/kallsyms.h            | 2 +-
>  kernel/livepatch/core.c             | 4 ++--
>  scripts/kallsyms.c                  | 2 +-
>  tools/include/linux/kallsyms.h      | 2 +-
>  tools/include/linux/lockdep.h       | 2 +-
>  tools/lib/perf/include/perf/event.h | 2 +-
>  tools/lib/symbol/kallsyms.h         | 2 +-
>  7 files changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h
> index 465060acc981..5cdc6903abca 100644
> --- a/include/linux/kallsyms.h
> +++ b/include/linux/kallsyms.h
> @@ -14,7 +14,7 @@
>
>  #include <asm/sections.h>
>
> -#define KSYM_NAME_LEN 128
> +#define KSYM_NAME_LEN 512
>  #define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \
>                          2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + 1)
>
> diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
> index 335d988bd811..73874e5edfda 100644
> --- a/kernel/livepatch/core.c
> +++ b/kernel/livepatch/core.c
> @@ -213,7 +213,7 @@ static int klp_resolve_symbols(Elf64_Shdr *sechdrs, const char *strtab,
>          * we use the smallest/strictest upper bound possible (56, based on
>          * the current definition of MODULE_NAME_LEN) to prevent overflows.
>          */
> -       BUILD_BUG_ON(MODULE_NAME_LEN < 56 || KSYM_NAME_LEN != 128);
> +       BUILD_BUG_ON(MODULE_NAME_LEN < 56 || KSYM_NAME_LEN != 512);
>
>         relas = (Elf_Rela *) relasec->sh_addr;
>         /* For each rela in this klp relocation section */
> @@ -227,7 +227,7 @@ static int klp_resolve_symbols(Elf64_Shdr *sechdrs, const char *strtab,
>
>                 /* Format: .klp.sym.sym_objname.sym_name,sympos */
>                 cnt = sscanf(strtab + sym->st_name,
> -                            ".klp.sym.%55[^.].%127[^,],%lu",
> +                            ".klp.sym.%55[^.].%511[^,],%lu",
>                              sym_objname, sym_name, &sympos);
>                 if (cnt != 3) {
>                         pr_err("symbol %s has an incorrectly formatted name\n",
> diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
> index bcdabee13aab..9bab5f55ade3 100644
> --- a/scripts/kallsyms.c
> +++ b/scripts/kallsyms.c
> @@ -27,7 +27,7 @@
>
>  #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
>
> -#define KSYM_NAME_LEN          128
> +#define KSYM_NAME_LEN          512
>
>  struct sym_entry {
>         unsigned long long addr;
> diff --git a/tools/include/linux/kallsyms.h b/tools/include/linux/kallsyms.h
> index efb6c3f5f2a9..5a37ccbec54f 100644
> --- a/tools/include/linux/kallsyms.h
> +++ b/tools/include/linux/kallsyms.h
> @@ -6,7 +6,7 @@
>  #include <stdio.h>
>  #include <unistd.h>
>
> -#define KSYM_NAME_LEN 128
> +#define KSYM_NAME_LEN 512
>
>  struct module;
>
> diff --git a/tools/include/linux/lockdep.h b/tools/include/linux/lockdep.h
> index e56997288f2b..d9c163f3ab24 100644
> --- a/tools/include/linux/lockdep.h
> +++ b/tools/include/linux/lockdep.h
> @@ -47,7 +47,7 @@ static inline int debug_locks_off(void)
>
>  #define task_pid_nr(tsk) ((tsk)->pid)
>
> -#define KSYM_NAME_LEN 128
> +#define KSYM_NAME_LEN 512
>  #define printk(...) dprintf(STDOUT_FILENO, __VA_ARGS__)
>  #define pr_err(format, ...) fprintf (stderr, format, ## __VA_ARGS__)
>  #define pr_warn pr_err
> diff --git a/tools/lib/perf/include/perf/event.h b/tools/lib/perf/include/perf/event.h
> index d82054225fcc..f5c40325b441 100644
> --- a/tools/lib/perf/include/perf/event.h
> +++ b/tools/lib/perf/include/perf/event.h
> @@ -93,7 +93,7 @@ struct perf_record_throttle {
>  };
>
>  #ifndef KSYM_NAME_LEN
> -#define KSYM_NAME_LEN 256
> +#define KSYM_NAME_LEN 512
>  #endif
>
>  struct perf_record_ksymbol {
> diff --git a/tools/lib/symbol/kallsyms.h b/tools/lib/symbol/kallsyms.h
> index 72ab9870454b..542f9b059c3b 100644
> --- a/tools/lib/symbol/kallsyms.h
> +++ b/tools/lib/symbol/kallsyms.h
> @@ -7,7 +7,7 @@
>  #include <linux/types.h>
>
>  #ifndef KSYM_NAME_LEN
> -#define KSYM_NAME_LEN 256
> +#define KSYM_NAME_LEN 512
>  #endif
>
>  static inline u8 kallsyms2elf_binding(char type)
> --
> 2.17.1
>
diff mbox series

Patch

diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h
index 465060acc981..5cdc6903abca 100644
--- a/include/linux/kallsyms.h
+++ b/include/linux/kallsyms.h
@@ -14,7 +14,7 @@ 
 
 #include <asm/sections.h>
 
-#define KSYM_NAME_LEN 128
+#define KSYM_NAME_LEN 512
 #define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \
 			 2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + 1)
 
diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index 335d988bd811..73874e5edfda 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -213,7 +213,7 @@  static int klp_resolve_symbols(Elf64_Shdr *sechdrs, const char *strtab,
 	 * we use the smallest/strictest upper bound possible (56, based on
 	 * the current definition of MODULE_NAME_LEN) to prevent overflows.
 	 */
-	BUILD_BUG_ON(MODULE_NAME_LEN < 56 || KSYM_NAME_LEN != 128);
+	BUILD_BUG_ON(MODULE_NAME_LEN < 56 || KSYM_NAME_LEN != 512);
 
 	relas = (Elf_Rela *) relasec->sh_addr;
 	/* For each rela in this klp relocation section */
@@ -227,7 +227,7 @@  static int klp_resolve_symbols(Elf64_Shdr *sechdrs, const char *strtab,
 
 		/* Format: .klp.sym.sym_objname.sym_name,sympos */
 		cnt = sscanf(strtab + sym->st_name,
-			     ".klp.sym.%55[^.].%127[^,],%lu",
+			     ".klp.sym.%55[^.].%511[^,],%lu",
 			     sym_objname, sym_name, &sympos);
 		if (cnt != 3) {
 			pr_err("symbol %s has an incorrectly formatted name\n",
diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index bcdabee13aab..9bab5f55ade3 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -27,7 +27,7 @@ 
 
 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
 
-#define KSYM_NAME_LEN		128
+#define KSYM_NAME_LEN		512
 
 struct sym_entry {
 	unsigned long long addr;
diff --git a/tools/include/linux/kallsyms.h b/tools/include/linux/kallsyms.h
index efb6c3f5f2a9..5a37ccbec54f 100644
--- a/tools/include/linux/kallsyms.h
+++ b/tools/include/linux/kallsyms.h
@@ -6,7 +6,7 @@ 
 #include <stdio.h>
 #include <unistd.h>
 
-#define KSYM_NAME_LEN 128
+#define KSYM_NAME_LEN 512
 
 struct module;
 
diff --git a/tools/include/linux/lockdep.h b/tools/include/linux/lockdep.h
index e56997288f2b..d9c163f3ab24 100644
--- a/tools/include/linux/lockdep.h
+++ b/tools/include/linux/lockdep.h
@@ -47,7 +47,7 @@  static inline int debug_locks_off(void)
 
 #define task_pid_nr(tsk) ((tsk)->pid)
 
-#define KSYM_NAME_LEN 128
+#define KSYM_NAME_LEN 512
 #define printk(...) dprintf(STDOUT_FILENO, __VA_ARGS__)
 #define pr_err(format, ...) fprintf (stderr, format, ## __VA_ARGS__)
 #define pr_warn pr_err
diff --git a/tools/lib/perf/include/perf/event.h b/tools/lib/perf/include/perf/event.h
index d82054225fcc..f5c40325b441 100644
--- a/tools/lib/perf/include/perf/event.h
+++ b/tools/lib/perf/include/perf/event.h
@@ -93,7 +93,7 @@  struct perf_record_throttle {
 };
 
 #ifndef KSYM_NAME_LEN
-#define KSYM_NAME_LEN 256
+#define KSYM_NAME_LEN 512
 #endif
 
 struct perf_record_ksymbol {
diff --git a/tools/lib/symbol/kallsyms.h b/tools/lib/symbol/kallsyms.h
index 72ab9870454b..542f9b059c3b 100644
--- a/tools/lib/symbol/kallsyms.h
+++ b/tools/lib/symbol/kallsyms.h
@@ -7,7 +7,7 @@ 
 #include <linux/types.h>
 
 #ifndef KSYM_NAME_LEN
-#define KSYM_NAME_LEN 256
+#define KSYM_NAME_LEN 512
 #endif
 
 static inline u8 kallsyms2elf_binding(char type)