On 07/18/2018 08:33 AM, Christoph Hellwig wrote:
>> - if (syscall(SYS_setresgid, pw->pw_gid, pw->pw_gid, pw->pw_gid) != 0) {
>> +#ifdef __NR_setresuid32
>> + res = syscall(SYS_setresgid32, pw->pw_gid, pw->pw_gid, pw->pw_gid);
>> +#else
>> + res = syscall(SYS_setresgid, pw->pw_gid, pw->pw_gid, pw->pw_gid);
>> +#endif
>
> I think you want to simply call setresuid/setresgid from glibcs, which
> will do the right thing instead of doing hand crafted syscalls.
Here is the comment above these calls
/* Switch the UIDs and GIDs. */
/* For the threaded version we have to set uid,gid per thread instead
* of per process. glibc setresuid() when called from a thread, it'll
* send a signal to all other threads to synchronize the uid in all
* other threads. To bypass this, we have to call syscall() directly.
*/
steved.
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