6.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Charlie Jenkins charlie@rivosinc.com
[ Upstream commit bba547810c66434475d8800b3411c59ef71eafe9 ]
The size of ®s->a0 is unknown, causing the error:
../include/linux/fortify-string.h:571:25: warning: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Wattribute-warning]
Fix this by wrapping the required registers in pt_regs with struct_group() and reference the group when doing the offending memcpy().
Signed-off-by: Charlie Jenkins charlie@rivosinc.com Reviewed-by: Alexandre Ghiti alexghiti@rivosinc.com Tested-by: Alexandre Ghiti alexghiti@rivosinc.com Link: https://lore.kernel.org/r/20250224-fix_ftrace_partial_regs-v1-1-54b906417e86... Signed-off-by: Alexandre Ghiti alexghiti@rivosinc.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/riscv/include/asm/ftrace.h | 2 +- arch/riscv/include/asm/ptrace.h | 18 ++++++++++-------- 2 files changed, 11 insertions(+), 9 deletions(-)
diff --git a/arch/riscv/include/asm/ftrace.h b/arch/riscv/include/asm/ftrace.h index 2636ee00ccf0f..9704a73e515a5 100644 --- a/arch/riscv/include/asm/ftrace.h +++ b/arch/riscv/include/asm/ftrace.h @@ -207,7 +207,7 @@ ftrace_partial_regs(const struct ftrace_regs *fregs, struct pt_regs *regs) { struct __arch_ftrace_regs *afregs = arch_ftrace_regs(fregs);
- memcpy(®s->a0, afregs->args, sizeof(afregs->args)); + memcpy(®s->a_regs, afregs->args, sizeof(afregs->args)); regs->epc = afregs->epc; regs->ra = afregs->ra; regs->sp = afregs->sp; diff --git a/arch/riscv/include/asm/ptrace.h b/arch/riscv/include/asm/ptrace.h index b5b0adcc85c18..2910231977cb7 100644 --- a/arch/riscv/include/asm/ptrace.h +++ b/arch/riscv/include/asm/ptrace.h @@ -23,14 +23,16 @@ struct pt_regs { unsigned long t2; unsigned long s0; unsigned long s1; - unsigned long a0; - unsigned long a1; - unsigned long a2; - unsigned long a3; - unsigned long a4; - unsigned long a5; - unsigned long a6; - unsigned long a7; + struct_group(a_regs, + unsigned long a0; + unsigned long a1; + unsigned long a2; + unsigned long a3; + unsigned long a4; + unsigned long a5; + unsigned long a6; + unsigned long a7; + ); unsigned long s2; unsigned long s3; unsigned long s4;