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Merge branch 'backport-3582-dirent-alignment-glib-2-76' into 'glib-2-76'

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Backport !3582 “Buffer needs to be aligned correctly to receive linux_dirent64.” to glib-2-76

See merge request GNOME/glib!3615
This commit is contained in:
Philip Withnall 2023-10-04 08:19:01 +00:00
commit e272f135da
1 changed files with 10 additions and 3 deletions
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11
glib/gspawn.c
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@ -1440,16 +1440,23 @@ safe_fdwalk (int (*cb)(void *data, int fd), void *data)
/* Avoid use of opendir/closedir since these are not async-signal-safe. */
int dir_fd = open ("/proc/self/fd", O_RDONLY | O_DIRECTORY);
if (dir_fd >= 0)
{
/* buf needs to be aligned correctly to receive linux_dirent64.
* C11 has _Alignof for this purpose, but for now a
* union serves the same purpose. */
union
{
char buf[4096];
struct linux_dirent64 alignment;
} u;
int pos, nread;
struct linux_dirent64 *de;
while ((nread = syscall (SYS_getdents64, dir_fd, buf, sizeof(buf))) > 0)
while ((nread = syscall (SYS_getdents64, dir_fd, u.buf, sizeof (u.buf))) > 0)
{
for (pos = 0; pos < nread; pos += de->d_reclen)
{
de = (struct linux_dirent64 *)(buf + pos);
de = (struct linux_dirent64 *) (u.buf + pos);
fd = filename_to_fd (de->d_name);
if (fd < 0 || fd == dir_fd)