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Support linux /proc/self/fd paths

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Again, the details of the system's set-id interpreter script setup are
above our pay grade; we only care whether the path can vary between us
and the loader.
This commit is contained in:
Jōshin 2023-12-18 16:44:53 -05:00
parent 45ee600239
commit dae0d9e2bd
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1 changed files with 11 additions and 7 deletions
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18
libc/calls/getprogramexecutablename.greg.c
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@ -38,8 +38,12 @@
#define KERN_PROC 14 #define KERN_PROC 14
#define KERN_PROC_PATHNAME_FREEBSD 12 #define KERN_PROC_PATHNAME_FREEBSD 12
#define KERN_PROC_PATHNAME_NETBSD 5 #define KERN_PROC_PATHNAME_NETBSD 5
#define DEV_FD "/dev/fd/" #define DevFd() \
#define STRLEN_DEV_FD (sizeof(DEV_FD) - 1) (IsBsd() ? "/dev/fd/" : IsLinux() ? "/proc/self/fd/" : 0)
#define StrlenDevFd() \
((IsBsd() ? sizeof("/dev/fd/") : \
IsLinux() ? sizeof("/proc/self/fd/") : 0) \
- 1)
static struct { static struct {
atomic_uint once; atomic_uint once;
@ -144,11 +148,11 @@ static inline void InitProgramExecutableNameImpl(void) {
/dev/fd/ path. check for the latter and allow that. otherwise, use the /dev/fd/ path. check for the latter and allow that. otherwise, use the
empty string to obviate the TOCTOU problem between loader and binary. empty string to obviate the TOCTOU problem between loader and binary.
*/ */
if ((!IsNetbsd() && !IsOpenbsd() && !IsXnu()) /* any others? */ || if (!(b = DevFd()) ||
0 != strncmp(DEV_FD, __program_executable_name, STRLEN_DEV_FD) || 0 != strncmp(b, __program_executable_name, StrlenDevFd()) ||
!__program_executable_name[STRLEN_DEV_FD] || !__program_executable_name[StrlenDevFd()] ||
__program_executable_name[STRLEN_DEV_FD] == '.' || __program_executable_name[StrlenDevFd()] == '.' ||
strchr(__program_executable_name + STRLEN_DEV_FD, '/')) { strchr(__program_executable_name + StrlenDevFd(), '/')) {
goto UseEmpty; goto UseEmpty;
} }
} }