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Merge pull request #445 from trapexit/setreuid

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call 32bit versions of set/geteuid on 32bit platforms
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trapexit 2017-10-17 22:23:27 -04:00 committed by GitHub
commit 8ea0b395b2
1 changed files with 36 additions and 6 deletions
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42
src/ugid_linux.hpp
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@ -27,6 +27,31 @@
#include <map>
#include <vector>
#if defined SYS_setreuid32
#define SETREUID(R,E) (::syscall(SYS_setreuid32,(R),(E)))
#else
#define SETREUID(R,E) (::syscall(SYS_setreuid,(R),(E)))
#endif
#if defined SYS_setregid32
#define SETREGID(R,E) (::syscall(SYS_setregid32,(R),(E)))
#else
#define SETREGID(R,E) (::syscall(SYS_setregid,(R),(E)))
#endif
#if defined SYS_geteuid32
#define GETEUID() (::syscall(SYS_geteuid32))
#else
#define GETEUID() (::syscall(SYS_geteuid))
#endif
#if defined SYS_getegid32
#define GETEGID() (::syscall(SYS_getegid32))
#else
#define GETEGID() (::syscall(SYS_getegid))
#endif
namespace mergerfs
{
namespace ugid
@ -42,8 +67,8 @@ namespace mergerfs
{
if(!initialized)
{
currentuid = ::syscall(SYS_geteuid);
currentgid = ::syscall(SYS_getegid);
currentuid = GETEUID();
currentgid = GETEGID();
initialized = true;
}
@ -52,18 +77,18 @@ namespace mergerfs
if(currentuid != 0)
{
::syscall(SYS_setreuid,-1,0);
::syscall(SYS_setregid,-1,0);
SETREUID(-1,0);
SETREGID(-1,0);
}
if(newgid)
{
::syscall(SYS_setregid,-1,newgid);
SETREGID(-1,newgid);
initgroups(newuid,newgid);
}
if(newuid)
::syscall(SYS_setreuid,-1,newuid);
SETREUID(-1,newuid);
currentuid = newuid;
currentgid = newgid;
@ -89,3 +114,8 @@ namespace mergerfs
};
}
}
#undef SETREUID
#undef SETREGID
#undef GETEUID
#undef GETEGID