fix remaining direct use of stat syscalls outside fstatat.c

because struct stat is no longer assumed to correspond to the
structure used by the stat-family syscalls, it's not valid to make any
of these syscalls directly using a buffer of type struct stat.

commit 9493892021eac4edf1776d945bcdd3f7a96f6978 moved all logic around
this change for stat-family functions into fstatat.c, making the
others wrappers for it. but a few other direct uses of the syscall
were overlooked. the ones in tmpnam/tempnam are harmless since the
syscalls are just used to test for file existence. however, the uses
in fchmodat and __map_file depend on getting accurate file properties,
and these functions may actually have been broken one or more mips
variants due to removal of conversion hacks from syscall_arch.h.

as a low-risk fix, simply use struct kstat in place of struct stat in
the affected places.

2 files changed, 6 insertions, 4 deletions

diff --git a/src/stdio/tempnam.c b/src/stdio/tempnam.c
index 84f91978..565df6b6 100644
--- a/src/stdio/tempnam.c
+++ b/src/stdio/tempnam.c
@@ -6,6 +6,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include "syscall.h"
+#include "kstat.h"
 
 #define MAXTRIES 100
 
@@ -37,10 +38,10 @@ char *tempnam(const char *dir, const char *pfx)
 	for (try=0; try<MAXTRIES; try++) {
 		__randname(s+l-6);
 #ifdef SYS_lstat
-		r = __syscall(SYS_lstat, s, &(struct stat){0});
+		r = __syscall(SYS_lstat, s, &(struct kstat){0});
 #else
 		r = __syscall(SYS_fstatat, AT_FDCWD, s,
-			&(struct stat){0}, AT_SYMLINK_NOFOLLOW);
+			&(struct kstat){0}, AT_SYMLINK_NOFOLLOW);
 #endif
 		if (r == -ENOENT) return strdup(s);
 	}
diff --git a/src/stdio/tmpnam.c b/src/stdio/tmpnam.c
index 6c7c253a..d667a836 100644
--- a/src/stdio/tmpnam.c
+++ b/src/stdio/tmpnam.c
@@ -5,6 +5,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include "syscall.h"
+#include "kstat.h"
 
 #define MAXTRIES 100
 
@@ -17,10 +18,10 @@ char *tmpnam(char *buf)
 	for (try=0; try<MAXTRIES; try++) {
 		__randname(s+12);
 #ifdef SYS_lstat
-		r = __syscall(SYS_lstat, s, &(struct stat){0});
+		r = __syscall(SYS_lstat, s, &(struct kstat){0});
 #else
 		r = __syscall(SYS_fstatat, AT_FDCWD, s,
-			&(struct stat){0}, AT_SYMLINK_NOFOLLOW);
+			&(struct kstat){0}, AT_SYMLINK_NOFOLLOW);
 #endif
 		if (r == -ENOENT) return strcpy(buf ? buf : internal, s);
 	}