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server: Avoid mkstemps(). 

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Alexandre Julliard 2021-10-05 11:51:42 +02:00
parent 6a7c4947a0
commit 93609869c8
1 changed files with 19 additions and 4 deletions
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23
server/mapping.c
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@ -263,14 +263,29 @@ int grow_file( int unix_fd, file_pos_t new_size )
return 0; return 0;
} }
/* simplified version of mkstemps() */
static int make_temp_file( char name[16] )
{
static unsigned int value;
int i, fd = -1;
value += (current_time >> 16) + current_time;
for (i = 0; i < 0x8000 && fd < 0; i++, value += 7777)
{
sprintf( name, "tmpmap-%08x", value );
fd = open( name, O_RDWR | O_CREAT | O_EXCL, 0600 );
}
return fd;
}
/* check if the current directory allows exec mappings */ /* check if the current directory allows exec mappings */
static int check_current_dir_for_exec(void) static int check_current_dir_for_exec(void)
{ {
int fd; int fd;
char tmpfn[] = "anonmap.XXXXXX"; char tmpfn[16];
void *ret = MAP_FAILED; void *ret = MAP_FAILED;
fd = mkstemps( tmpfn, 0 ); fd = make_temp_file( tmpfn );
if (fd == -1) return 0; if (fd == -1) return 0;
if (grow_file( fd, 1 )) if (grow_file( fd, 1 ))
{ {
@ -286,7 +301,7 @@ static int check_current_dir_for_exec(void)
static int create_temp_file( file_pos_t size ) static int create_temp_file( file_pos_t size )
{ {
static int temp_dir_fd = -1; static int temp_dir_fd = -1;
char tmpfn[] = "anonmap.XXXXXX"; char tmpfn[16];
int fd; int fd;
if (temp_dir_fd == -1) if (temp_dir_fd == -1)
@ -304,7 +319,7 @@ static int create_temp_file( file_pos_t size )
} }
else if (temp_dir_fd != server_dir_fd) fchdir( temp_dir_fd ); else if (temp_dir_fd != server_dir_fd) fchdir( temp_dir_fd );
fd = mkstemps( tmpfn, 0 ); fd = make_temp_file( tmpfn );
if (fd != -1) if (fd != -1)
{ {
if (!grow_file( fd, size )) if (!grow_file( fd, size ))