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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
No known key found for this signature in database
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_PATHNAME_FREEBSD 12
#define KERN_PROC_PATHNAME_NETBSD 5
#define DEV_FD "/dev/fd/"
#define STRLEN_DEV_FD (sizeof(DEV_FD) - 1)
#define DevFd() \
(IsBsd() ? "/dev/fd/" : IsLinux() ? "/proc/self/fd/" : 0)
#define StrlenDevFd() \
((IsBsd() ? sizeof("/dev/fd/") : \
IsLinux() ? sizeof("/proc/self/fd/") : 0) \
- 1)
static struct {
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
empty string to obviate the TOCTOU problem between loader and binary.
*/
if ((!IsNetbsd() && !IsOpenbsd() && !IsXnu()) /* any others? */ ||
0 != strncmp(DEV_FD, __program_executable_name, STRLEN_DEV_FD) ||
!__program_executable_name[STRLEN_DEV_FD] ||
__program_executable_name[STRLEN_DEV_FD] == '.' ||
strchr(__program_executable_name + STRLEN_DEV_FD, '/')) {
if (!(b = DevFd()) ||
0 != strncmp(b, __program_executable_name, StrlenDevFd()) ||
!__program_executable_name[StrlenDevFd()] ||
__program_executable_name[StrlenDevFd()] == '.' ||
strchr(__program_executable_name + StrlenDevFd(), '/')) {
goto UseEmpty;
}
}