+++ /dev/null
-From 14adc898a36948267bfe5c63b399996879e94c98 Mon Sep 17 00:00:00 2001
-From: Andreas Gruenbacher <agruenba@redhat.com>
-Date: Fri, 17 Aug 2018 14:07:31 +0200
-Subject: Switch back to syscall()
-
-Switch back to syscall() for the *xattr system calls. The current
-mechanism of forwarding those calls to glibc breaks libraries like
-libfakeroot (fakeroot) and libasan (the gcc address sanitizer; gcc
--fsanitize=address).
-
-Those libraries provide wrappers for functions defined in other shared
-libraries, usually glibc, do their own processing, and forward calls to
-the original symbols looke dup via dlsym(RTLD_NEXT, "symbol_name"). In
-our case, dlsym returns the libattr_*xattr wrappers. However, when our
-wrappers try calling glibc, they end up calling the libfakeroot /
-libasan wrappers instead because those override the original symbols =>
-recursion.
-
-The libattr_*xattr wrappers will only be used when symbols are looked up
-at runtime (dlopen / dlsym). Programs linking against libattr will
-directly use the glibc provided symbols. Therefore, the slightly worse
-performance of syscall() won't affect any of the "normal" users of
-libattr.
-
-[nicolas.cavallari: with uclibc-ng, the recursion always happen]
-Signed-off-by: Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
----
- libattr/syscalls.c | 26 ++++++++++++++------------
- 1 file changed, 14 insertions(+), 12 deletions(-)
-
-diff --git a/libattr/syscalls.c b/libattr/syscalls.c
-index 3013aa0..721ad7f 100644
---- a/libattr/syscalls.c
-+++ b/libattr/syscalls.c
-@@ -22,6 +22,8 @@
-
- #include "config.h"
-
-+#include <unistd.h>
-+#include <sys/syscall.h>
- #include <sys/xattr.h>
-
- #ifdef HAVE_VISIBILITY_ATTRIBUTE
-@@ -31,67 +33,67 @@
- int libattr_setxattr(const char *path, const char *name,
- void *value, size_t size, int flags)
- {
-- return setxattr(path, name, value, size, flags);
-+ return syscall(__NR_setxattr, path, name, value, size, flags);
- }
-
- int libattr_lsetxattr(const char *path, const char *name,
- void *value, size_t size, int flags)
- {
-- return lsetxattr(path, name, value, size, flags);
-+ return syscall(__NR_lsetxattr, path, name, value, size, flags);
- }
-
- int libattr_fsetxattr(int filedes, const char *name,
- void *value, size_t size, int flags)
- {
-- return fsetxattr(filedes, name, value, size, flags);
-+ return syscall(__NR_fsetxattr, filedes, name, value, size, flags);
- }
-
- ssize_t libattr_getxattr(const char *path, const char *name,
- void *value, size_t size)
- {
-- return getxattr(path, name, value, size);
-+ return syscall(__NR_getxattr, path, name, value, size);
- }
-
- ssize_t libattr_lgetxattr(const char *path, const char *name,
- void *value, size_t size)
- {
-- return lgetxattr(path, name, value, size);
-+ return syscall(__NR_lgetxattr, path, name, value, size);
- }
-
- ssize_t libattr_fgetxattr(int filedes, const char *name,
- void *value, size_t size)
- {
-- return fgetxattr(filedes, name, value, size);
-+ return syscall(__NR_fgetxattr, filedes, name, value, size);
- }
-
- ssize_t libattr_listxattr(const char *path, char *list, size_t size)
- {
-- return listxattr(path, list, size);
-+ return syscall(__NR_listxattr, path, list, size);
- }
-
- ssize_t libattr_llistxattr(const char *path, char *list, size_t size)
- {
-- return llistxattr(path, list, size);
-+ return syscall(__NR_llistxattr, path, list, size);
- }
-
- ssize_t libattr_flistxattr(int filedes, char *list, size_t size)
- {
-- return flistxattr(filedes, list, size);
-+ return syscall(__NR_flistxattr, filedes, list, size);
- }
-
- int libattr_removexattr(const char *path, const char *name)
- {
-- return removexattr(path, name);
-+ return syscall(__NR_removexattr, path, name);
- }
-
- int libattr_lremovexattr(const char *path, const char *name)
- {
-- return lremovexattr(path, name);
-+ return syscall(__NR_lremovexattr, path, name);
- }
-
- int libattr_fremovexattr(int filedes, const char *name)
- {
-- return fremovexattr(filedes, name);
-+ return syscall(__NR_fremovexattr, filedes, name);
- }
-
- #ifdef HAVE_VISIBILITY_ATTRIBUTE
---
-cgit v1.0-41-gc330
-