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linux: make fstatat(2) handle AT_EMPTY_PATH

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Without it, Qt5 apps from Focal fail to start, being unable to load
their plugins.  It's also necessary for glibc 2.33, as found in recent
Arch snapshots.

PR:		254112
Reviewed By:	kib
Sponsored by:	The FreeBSD Foundation, EPSRC
Differential Revision:	https://reviews.freebsd.org/D28192
This commit is contained in:
Edward Tomasz Napierala 2021-04-16 08:52:59 +01:00
parent 9bacbf1ae2
commit 4b45c2bb83
1 changed files with 11 additions and 2 deletions
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13
sys/compat/linux/linux_stats.c
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@ -632,10 +632,14 @@ linux_fstatat64(struct thread *td, struct linux_fstatat64_args *args)
int error, dfd, flag;
struct stat buf;
if (args->flag & ~LINUX_AT_SYMLINK_NOFOLLOW)
if (args->flag & ~(LINUX_AT_SYMLINK_NOFOLLOW | LINUX_AT_EMPTY_PATH)) {
linux_msg(td, "fstatat64 unsupported flag 0x%x", args->flag);
return (EINVAL);
}
flag = (args->flag & LINUX_AT_SYMLINK_NOFOLLOW) ?
AT_SYMLINK_NOFOLLOW : 0;
flag |= (args->flag & LINUX_AT_EMPTY_PATH) ?
AT_EMPTY_PATH : 0;
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
if (!LUSECONVPATH(td)) {
@ -661,10 +665,15 @@ linux_newfstatat(struct thread *td, struct linux_newfstatat_args *args)
int error, dfd, flag;
struct stat buf;
if (args->flag & ~LINUX_AT_SYMLINK_NOFOLLOW)
if (args->flag & ~(LINUX_AT_SYMLINK_NOFOLLOW | LINUX_AT_EMPTY_PATH)) {
linux_msg(td, "fstatat unsupported flag 0x%x", args->flag);
return (EINVAL);
}
flag = (args->flag & LINUX_AT_SYMLINK_NOFOLLOW) ?
AT_SYMLINK_NOFOLLOW : 0;
flag |= (args->flag & LINUX_AT_EMPTY_PATH) ?
AT_EMPTY_PATH : 0;
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
if (!LUSECONVPATH(td)) {