[Buildroot] [PATCH] package/uclibc: disable SSP support for riscv32

[Buildroot] [PATCH] package/uclibc: disable SSP support for riscv32

[Romain Naour via buildroot]

On modern 32-bit architectures like RISC-V (riscv32), legacy 32-bit
time syscalls like __NR_gettimeofday are intentionally omitted because
RV32 implements a strict time64-only ABI to avoid the Year 2038 bug.

But uclibc-ng code [1] is using a direct __NR_gettimeofday syscall that
is not defined for riscv32.

[1] https://github.com/wbx-github/uclibc-ng/blob/ae4a98f9612c7050b1bceb9c8340fe5ef9345e22/ldso/include/dl-syscall.h#L263

As a workaround, we have to disable the SSP support for uclibc-ng
toolchain on riscv32 for now.

Fixes:
https://autobuild.buildroot.org/results/1b6/1b6f2161b11390b6545bddbc39b444401c718ebb/build-end.log

Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Romain Naour <romain.naour@smile.fr>
---
 package/uclibc/Config.in | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/package/uclibc/Config.in b/package/uclibc/Config.in
index 6b8b0d86f8..dfb74da789 100644
--- a/package/uclibc/Config.in
+++ b/package/uclibc/Config.in
@@ -100,6 +100,9 @@ config BR2_PTHREAD_DEBUG
 
 config BR2_TOOLCHAIN_BUILDROOT_USE_SSP
 	bool "Enable stack protection support"
+	# uClibc-ng ssp support requires __NR_gettimeofday defined.
+	# https://github.com/wbx-github/uclibc-ng/issues/19
+	depends on !BR2_RISCV_32
 	depends on BR2_PACKAGE_HOST_BINUTILS_SUPPORTS_CFI
 	select BR2_TOOLCHAIN_HAS_SSP
 	help
-- 
2.55.0

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Re: [Buildroot] [PATCH] package/uclibc: disable SSP support for riscv32

[Waldemar Brodkorb]

Hi Romain,
Romain Naour wrote,

> On modern 32-bit architectures like RISC-V (riscv32), legacy 32-bit
> time syscalls like __NR_gettimeofday are intentionally omitted because
> RV32 implements a strict time64-only ABI to avoid the Year 2038 bug.
> 
> But uclibc-ng code [1] is using a direct __NR_gettimeofday syscall that
> is not defined for riscv32.
> 
> [1] https://github.com/wbx-github/uclibc-ng/blob/ae4a98f9612c7050b1bceb9c8340fe5ef9345e22/ldso/include/dl-syscall.h#L263
> 
> As a workaround, we have to disable the SSP support for uclibc-ng
> toolchain on riscv32 for now.

Thanks for your patch.

I would rather like to fix it inside uClibc-ng like suggested here:
https://lists.buildroot.org/pipermail/buildroot/2026-August/807581.html
https://mailman.openadk.org/mailman3/hyperkitty/list/devel@uclibc-ng.org/thread/WIKMWPXJYAPTVVZ2MMZINUJNPIJXBMOE/

best regards
 Waldemar
 
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Re: [Buildroot] [PATCH] package/uclibc: disable SSP support for riscv32

[Romain Naour via buildroot]

Hello Waldemar, All,

Le 15/08/2026 à 21:21, Waldemar Brodkorb a écrit :
> Hi Romain,
> Romain Naour wrote,
> 
>> On modern 32-bit architectures like RISC-V (riscv32), legacy 32-bit
>> time syscalls like __NR_gettimeofday are intentionally omitted because
>> RV32 implements a strict time64-only ABI to avoid the Year 2038 bug.
>>
>> But uclibc-ng code [1] is using a direct __NR_gettimeofday syscall that
>> is not defined for riscv32.
>>
>> [1] https://github.com/wbx-github/uclibc-ng/blob/ae4a98f9612c7050b1bceb9c8340fe5ef9345e22/ldso/include/dl-syscall.h#L263
>>
>> As a workaround, we have to disable the SSP support for uclibc-ng
>> toolchain on riscv32 for now.
> 
> Thanks for your patch.
> 
> I would rather like to fix it inside uClibc-ng like suggested here:
> https://lists.buildroot.org/pipermail/buildroot/2026-August/807581.html
> https://mailman.openadk.org/mailman3/hyperkitty/list/devel@uclibc-ng.org/thread/WIKMWPXJYAPTVVZ2MMZINUJNPIJXBMOE/

Sure, thanks for fixing the issue so fast!

Best regards,
Romain

> 
> best regards
>  Waldemar
>  

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