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[v2,2/3] riscv: module: Allocate PLT entries for R_RISCV_PLT32

Message ID 20250409171526.862481-2-samuel.holland@sifive.com (mailing list archive)
State New
Headers show
Series [v2,1/3] riscv: module: Fix out-of-bounds relocation access | expand

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Commit Message

Samuel Holland April 9, 2025, 5:14 p.m. UTC 
apply_r_riscv_plt32_rela() may need to emit a PLT entry for the
referenced symbol, so there must be space allocated in the PLT.

Fixes: 8fd6c5142395 ("riscv: Add remaining module relocations")
Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
---

Changes in v2:
 - New patch for v2

 arch/riscv/kernel/module-sections.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

Comments

Andrew Jones April 9, 2025, 6:53 p.m. UTC | #1 
On Wed, Apr 09, 2025 at 10:14:50AM -0700, Samuel Holland wrote:
> apply_r_riscv_plt32_rela() may need to emit a PLT entry for the
> referenced symbol, so there must be space allocated in the PLT.
> 
> Fixes: 8fd6c5142395 ("riscv: Add remaining module relocations")
> Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
> ---
> 
> Changes in v2:
>  - New patch for v2
> 
>  arch/riscv/kernel/module-sections.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/riscv/kernel/module-sections.c b/arch/riscv/kernel/module-sections.c
> index e264e59e596e..91d0b355ceef 100644
> --- a/arch/riscv/kernel/module-sections.c
> +++ b/arch/riscv/kernel/module-sections.c
> @@ -73,16 +73,17 @@ static bool duplicate_rela(const Elf_Rela *rela, int idx)
>  static void count_max_entries(Elf_Rela *relas, int num,
>  			      unsigned int *plts, unsigned int *gots)
>  {
> -	unsigned int type, i;
> -
> -	for (i = 0; i < num; i++) {
> -		type = ELF_RISCV_R_TYPE(relas[i].r_info);
> -		if (type == R_RISCV_CALL_PLT) {
> +	for (int i = 0; i < num; i++) {
> +		switch (ELF_R_TYPE(relas[i].r_info)) {

I see ELF_R_TYPE() is equivalent to ELF_RISCV_R_TYPE(). So OK.

> +		case R_RISCV_CALL_PLT:
> +		case R_RISCV_PLT32:
>  			if (!duplicate_rela(relas, i))
>  				(*plts)++;
> -		} else if (type == R_RISCV_GOT_HI20) {
> +			break;
> +		case R_RISCV_GOT_HI20:
>  			if (!duplicate_rela(relas, i))
>  				(*gots)++;
> +			break;
>  		}
>  	}
>  }
> -- 
> 2.47.0
>

Reviewed-by: Andrew Jones <ajones@ventanamicro.com>

Thanks,
drew
diff mbox series

Patch

diff --git a/arch/riscv/kernel/module-sections.c b/arch/riscv/kernel/module-sections.c
index e264e59e596e..91d0b355ceef 100644
--- a/arch/riscv/kernel/module-sections.c
+++ b/arch/riscv/kernel/module-sections.c
@@ -73,16 +73,17 @@  static bool duplicate_rela(const Elf_Rela *rela, int idx)
 static void count_max_entries(Elf_Rela *relas, int num,
 			      unsigned int *plts, unsigned int *gots)
 {
-	unsigned int type, i;
-
-	for (i = 0; i < num; i++) {
-		type = ELF_RISCV_R_TYPE(relas[i].r_info);
-		if (type == R_RISCV_CALL_PLT) {
+	for (int i = 0; i < num; i++) {
+		switch (ELF_R_TYPE(relas[i].r_info)) {
+		case R_RISCV_CALL_PLT:
+		case R_RISCV_PLT32:
 			if (!duplicate_rela(relas, i))
 				(*plts)++;
-		} else if (type == R_RISCV_GOT_HI20) {
+			break;
+		case R_RISCV_GOT_HI20:
 			if (!duplicate_rela(relas, i))
 				(*gots)++;
+			break;
 		}
 	}
 }