Bug#939898: glibc: setuid/getuid broken on alpha with 2.29-1

On 10/09/2019 07:28, John Paul Adrian Glaubitz wrote:
> On 9/10/19 11:05 AM, John Paul Adrian Glaubitz wrote:
>> Yes, we have already figured out that this happens when the kernel is
>> too old. According to Aurelien, the problem is that the glibc package
>> has been built against the kernel 5.3 headers which is why users need
>> to upgrade their kernel first before upgrading glibc.
>>
>> Currently fixing tsunami.
> 
> I have now kernel 5.2.9-1 and glibc 2.29-1 and logging in still doesn't
> work. I type "root" at the login prompt, press enter and it shortly
> returns to the login prompt. Logging in through SSH doesn't work either.
> 
> Adrian
> 

I have consolidate the set* Linux implementations on dd5905de03bd2 
(glibc 2.26), which means that all Linux architectures should use
sysdeps/unix/sysv/linux/setuid.c for setuid and the auto-generated
syscalls for getuid.

Alpha use the linux generic implementation since ever, the 
dd5905de03bd2 change it will prioritize to use __NR_setuid32 instead
of __NR_setuid. But since it is not the case for alpha AFAIK it should
not change the code generation. I also checked that the code for
setuid for both glibc 2.25 and glibc 2.31 hasn't change, it issues the
__NR_setuid (23) for both cases.

I am not sure this is an glibc issue in this case.