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| author |   Fangrui Song <maskray@google.com> | 2020-11-06 21:46:11 +0100 |
|---|---|---|
| committer |   Russell King <rmk+kernel@armlinux.org.uk> | 2020-11-12 14:53:19 +0000 |
| commit | 735e8d93dc2b107f7891a9c2b1c4cfbea1fcbbbc (patch) | |
| tree | d37af8ed305cebd6185990a3bc124cb31efa3e36 /arch/arm/lib | |
| parent | ARM: 9020/1: mm: use correct section size macro to describe the FDT virtual address (diff) | |
| download | linux-dev-735e8d93dc2b107f7891a9c2b1c4cfbea1fcbbbc.tar.xz linux-dev-735e8d93dc2b107f7891a9c2b1c4cfbea1fcbbbc.zip | |
ARM: 9022/1: Change arch/arm/lib/mem*.S to use WEAK instead of .weak
Commit d6d51a96c7d6 ("ARM: 9014/2: Replace string mem* functions for
KASan") add .weak directives to memcpy/memmove/memset to avoid collision
with KASAN interceptors.
This does not work with LLVM's integrated assembler (the assembly snippet
`.weak memcpy ... .globl memcpy` produces a STB_GLOBAL memcpy while GNU as
produces a STB_WEAK memcpy). LLVM 12 (since https://reviews.llvm.org/D90108)
will error on such an overridden symbol binding.
Use the appropriate WEAK macro instead.
Link: https://github.com/ClangBuiltLinux/linux/issues/1190
--
Fixes: d6d51a96c7d6 ("ARM: 9014/2: Replace string mem* functions for KASan")
Reported-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Fangrui Song <maskray@google.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/lib')
| -rw-r--r-- | arch/arm/lib/memcpy.S | 3 | ||||
| -rw-r--r-- | arch/arm/lib/memmove.S | 3 | ||||
| -rw-r--r-- | arch/arm/lib/memset.S | 3 |
3 files changed, 3 insertions, 6 deletions
diff --git a/arch/arm/lib/memcpy.S b/arch/arm/lib/memcpy.S index ad4625d16e11..e4caf48c089f 100644 --- a/arch/arm/lib/memcpy.S +++ b/arch/arm/lib/memcpy.S @@ -58,10 +58,9 @@ /* Prototype: void *memcpy(void *dest, const void *src, size_t n); */ -.weak memcpy ENTRY(__memcpy) ENTRY(mmiocpy) -ENTRY(memcpy) +WEAK(memcpy) #include "copy_template.S" diff --git a/arch/arm/lib/memmove.S b/arch/arm/lib/memmove.S index fd123ea5a5a4..6fecc12a1f51 100644 --- a/arch/arm/lib/memmove.S +++ b/arch/arm/lib/memmove.S @@ -24,9 +24,8 @@ * occurring in the opposite direction. */ -.weak memmove ENTRY(__memmove) -ENTRY(memmove) +WEAK(memmove) UNWIND( .fnstart ) subs ip, r0, r1 diff --git a/arch/arm/lib/memset.S b/arch/arm/lib/memset.S index 0e7ff0423f50..9817cb258c1a 100644 --- a/arch/arm/lib/memset.S +++ b/arch/arm/lib/memset.S @@ -13,10 +13,9 @@ .text .align 5 -.weak memset ENTRY(__memset) ENTRY(mmioset) -ENTRY(memset) +WEAK(memset) UNWIND( .fnstart ) ands r3, r0, #3 @ 1 unaligned? mov ip, r0 @ preserve r0 as return value |