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hardening fixes for v6.5-rc2

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- Remove LTO-only suffixes from promoted global function symbols (Yonghong Song)
 
 - Remove unused .text..refcount section from vmlinux.lds.h (Petr Pavlu)
 
 - Add missing __always_inline to sparc __arch_xchg() (Arnd Bergmann)
 
 - Claim maintainership of string routines
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Merge tag 'hardening-v6.5-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull hardening fixes from Kees Cook:

 - Remove LTO-only suffixes from promoted global function symbols
   (Yonghong Song)

 - Remove unused .text..refcount section from vmlinux.lds.h (Petr Pavlu)

 - Add missing __always_inline to sparc __arch_xchg() (Arnd Bergmann)

 - Claim maintainership of string routines

* tag 'hardening-v6.5-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  sparc: mark __arch_xchg() as __always_inline
  MAINTAINERS: Foolishly claim maintainership of string routines
  kallsyms: strip LTO-only suffixes from promoted global functions
  vmlinux.lds.h: Remove a reference to no longer used sections .text..refcount
This commit is contained in:
Linus Torvalds 2023-07-16 12:18:18 -07:00
commit 6eede0686f
6 changed files with 11 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
MAINTAINERS
View File

@ -8679,8 +8679,11 @@ S: Maintained
F: drivers/input/touchscreen/resistive-adc-touch.c
GENERIC STRING LIBRARY
M: Kees Cook <keescook@chromium.org>
R: Andy Shevchenko <andy@kernel.org>
S: Maintained
L: linux-hardening@vger.kernel.org
S: Supported
T: git git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/hardening
F: include/linux/string.h
F: include/linux/string_choices.h
F: include/linux/string_helpers.h

2
arch/sparc/include/asm/cmpxchg_32.h
View File

@ -15,7 +15,7 @@
unsigned long __xchg_u32(volatile u32 *m, u32 new);
void __xchg_called_with_bad_pointer(void);
static inline unsigned long __arch_xchg(unsigned long x, __volatile__ void * ptr, int size)
static __always_inline unsigned long __arch_xchg(unsigned long x, __volatile__ void * ptr, int size)
{
switch (size) {
case 4:

2
arch/sparc/include/asm/cmpxchg_64.h
View File

@ -87,7 +87,7 @@ xchg16(__volatile__ unsigned short *m, unsigned short val)
return (load32 & mask) >> bit_shift;
}
static inline unsigned long
static __always_inline unsigned long
__arch_xchg(unsigned long x, __volatile__ void * ptr, int size)
{
switch (size) {

1
include/asm-generic/vmlinux.lds.h
View File

@ -578,7 +578,6 @@
*(.text.unlikely .text.unlikely.*) \
*(.text.unknown .text.unknown.*) \
NOINSTR_TEXT \
*(.text..refcount) \
*(.ref.text) \
*(.text.asan.* .text.tsan.*) \
MEM_KEEP(init.text*) \

5
kernel/kallsyms.c
View File

@ -174,11 +174,10 @@ static bool cleanup_symbol_name(char *s)
* LLVM appends various suffixes for local functions and variables that
* must be promoted to global scope as part of LTO. This can break
* hooking of static functions with kprobes. '.' is not a valid
* character in an identifier in C. Suffixes observed:
* character in an identifier in C. Suffixes only in LLVM LTO observed:
* - foo.llvm.[0-9a-f]+
* - foo.[0-9a-f]+
*/
res = strchr(s, '.');
res = strstr(s, ".llvm.");
if (res) {
*res = '\0';
return true;

6
scripts/kallsyms.c
View File

@ -349,10 +349,10 @@ static void cleanup_symbol_name(char *s)
* ASCII[_] = 5f
* ASCII[a-z] = 61,7a
*
* As above, replacing '.' with '\0' does not affect the main sorting,
* but it helps us with subsorting.
* As above, replacing the first '.' in ".llvm." with '\0' does not
* affect the main sorting, but it helps us with subsorting.
*/
p = strchr(s, '.');
p = strstr(s, ".llvm.");
if (p)
*p = '\0';
}