[PATCH] Fix misreported errno on preadv2/pwritev2 (BZ#23579)

[Adhemerval Zanella <adhemerval dot zanella at linaro dot org>]

The fallback code of Linux wrapper for preadv2/pwritev2 executes
regardless of the errno code for preadv2, instead of the case where
the syscall is not supported.

This fixes it by calling the fallback code iff errno is ENOSYS. The
patch also adds tests for both invalid file descriptor and invalid
iov_len and vector count.

The only discrepancy between preadv2 and fallback code regarding
error reporting is when an invalid flags are used.  The fallback code
bails out earlier with ENOTSUP instead of EINVAL/EBADF when the syscall
is used.

Checked on x86_64-linux-gnu on a 4.4.0 and 4.15.0 kernel.

	[BZ #23579]
	* misc/tst-preadvwritev2-common.c (do_test_with_invalid_fd): New
	test.
	* misc/tst-preadvwritev2.c, misc/tst-preadvwritev64v2.c (do_test):
	Call do_test_with_invalid_fd.
	* sysdeps/unix/sysv/linux/preadv2.c (preadv2): Use fallback code iff
	errno is ENOSYS.
	* sysdeps/unix/sysv/linux/preadv64v2.c (preadv64v2): Likewise.
	* sysdeps/unix/sysv/linux/pwritev2.c (pwritev2): Likewise.
	* sysdeps/unix/sysv/linux/pwritev64v2.c (pwritev64v2): Likewise.
---
 ChangeLog                             | 13 ++++++
 misc/tst-preadvwritev2-common.c       | 65 +++++++++++++++++++++++++--
 misc/tst-preadvwritev2.c              |  2 +
 misc/tst-preadvwritev64v2.c           |  2 +
 sysdeps/unix/sysv/linux/preadv2.c     |  2 +-
 sysdeps/unix/sysv/linux/preadv64v2.c  |  2 +-
 sysdeps/unix/sysv/linux/pwritev2.c    |  2 +-
 sysdeps/unix/sysv/linux/pwritev64v2.c |  2 +-
 8 files changed, 83 insertions(+), 7 deletions(-)

diff --git a/misc/tst-preadvwritev2-common.c b/misc/tst-preadvwritev2-common.c
index f889a21544..50b9da3fea 100644
--- a/misc/tst-preadvwritev2-common.c
+++ b/misc/tst-preadvwritev2-common.c
@@ -19,9 +19,6 @@
 #include <limits.h>
 #include <support/check.h>
 
-static void
-do_test_with_invalid_flags (void)
-{
 #ifndef RWF_HIPRI
 # define RWF_HIPRI 0
 #endif
@@ -39,6 +36,68 @@ do_test_with_invalid_flags (void)
 #endif
 #define RWF_SUPPORTED	(RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT \
 			 | RWF_APPEND)
+
+static void
+do_test_with_invalid_fd (void)
+{
+  char buf[256];
+  struct iovec iov = { buf, sizeof buf };
+
+  /* Check with flag being 0 to use the fallback code which calls pwritev
+     or writev.  */
+  TEST_VERIFY (preadv2 (-1, &iov, 1, -1, 0) == -1);
+  TEST_COMPARE (errno, EBADF);
+  TEST_VERIFY (pwritev2 (-1, &iov, 1, -1, 0) == -1);
+  TEST_COMPARE (errno, EBADF);
+
+  /* Same tests as before but with flags being different than 0.  Since
+     there is no emulation for any flag value, fallback code returns
+     ENOTSUP.  This is different running on a kernel with preadv2/pwritev2
+     support, where EBADF is returned).  */
+  TEST_VERIFY (preadv2 (-1, &iov, 1, 0, RWF_HIPRI) == -1);
+  TEST_VERIFY (errno == EBADF || errno == ENOTSUP);
+  TEST_VERIFY (pwritev2 (-1, &iov, 1, 0, RWF_HIPRI) == -1);
+  TEST_VERIFY (errno == EBADF || errno == ENOTSUP);
+}
+
+static void
+do_test_with_invalid_iov (void)
+{
+  {
+    char buf[256];
+    struct iovec iov;
+
+    iov.iov_base = buf;
+    iov.iov_len = (size_t)SSIZE_MAX + 1;
+
+    TEST_VERIFY (preadv2 (temp_fd, &iov, 1, 0, 0) == -1);
+    TEST_COMPARE (errno, EINVAL);
+    TEST_VERIFY (pwritev2 (temp_fd, &iov, 1, 0, 0) == -1);
+    TEST_COMPARE (errno, EINVAL);
+
+    /* Same as for invalid file descriptor tests, emulation fallback
+       first checks for flag value and return ENOTSUP.  */
+    TEST_VERIFY (preadv2 (temp_fd, &iov, 1, 0, RWF_HIPRI) == -1);
+    TEST_VERIFY (errno == EINVAL || errno == ENOTSUP);
+    TEST_VERIFY (pwritev2 (temp_fd, &iov, 1, 0, RWF_HIPRI) == -1);
+    TEST_VERIFY (errno == EINVAL || errno == ENOTSUP);
+  }
+
+  {
+    /* An invalid iovec buffer should trigger an invalid memory access
+       or an error (Linux for instance returns EFAULT).  */
+    struct iovec iov[IOV_MAX+1] = { 0 };
+
+    TEST_VERIFY (preadv2 (temp_fd, iov, IOV_MAX + 1, 0, RWF_HIPRI) == -1);
+    TEST_VERIFY (errno == EINVAL || errno == ENOTSUP);
+    TEST_VERIFY (pwritev2 (temp_fd, iov, IOV_MAX + 1, 0, RWF_HIPRI) == -1);
+    TEST_VERIFY (errno == EINVAL || errno == ENOTSUP);
+  }
+}
+
+static void
+do_test_with_invalid_flags (void)
+{
   /* Set the next bit from the mask of all supported flags.  */
   int invalid_flag = RWF_SUPPORTED != 0 ? __builtin_clz (RWF_SUPPORTED) : 2;
   invalid_flag = 0x1 << ((sizeof (int) * CHAR_BIT) - invalid_flag);
diff --git a/misc/tst-preadvwritev2.c b/misc/tst-preadvwritev2.c
index be22802dbe..cb58cbe41e 100644
--- a/misc/tst-preadvwritev2.c
+++ b/misc/tst-preadvwritev2.c
@@ -30,6 +30,8 @@ do_test (void)
 {
   do_test_with_invalid_flags ();
   do_test_without_offset ();
+  do_test_with_invalid_fd ();
+  do_test_with_invalid_iov ();
 
   return do_test_with_offset (0);
 }
diff --git a/misc/tst-preadvwritev64v2.c b/misc/tst-preadvwritev64v2.c
index 8d3cc32b28..6a9de54c78 100644
--- a/misc/tst-preadvwritev64v2.c
+++ b/misc/tst-preadvwritev64v2.c
@@ -32,6 +32,8 @@ do_test (void)
 {
   do_test_with_invalid_flags ();
   do_test_without_offset ();
+  do_test_with_invalid_fd ();
+  do_test_with_invalid_iov ();
 
   return do_test_with_offset (0);
 }
diff --git a/sysdeps/unix/sysv/linux/preadv2.c b/sysdeps/unix/sysv/linux/preadv2.c
index c8bf0764ef..bb08cbc5fd 100644
--- a/sysdeps/unix/sysv/linux/preadv2.c
+++ b/sysdeps/unix/sysv/linux/preadv2.c
@@ -32,7 +32,7 @@ preadv2 (int fd, const struct iovec *vector, int count, off_t offset,
 # ifdef __NR_preadv2
   ssize_t result = SYSCALL_CANCEL (preadv2, fd, vector, count,
 				   LO_HI_LONG (offset), flags);
-  if (result >= 0)
+  if (result >= 0 || errno != ENOSYS)
     return result;
 # endif
   /* Trying to emulate the preadv2 syscall flags is troublesome:
diff --git a/sysdeps/unix/sysv/linux/preadv64v2.c b/sysdeps/unix/sysv/linux/preadv64v2.c
index d7400a0252..b72a047347 100644
--- a/sysdeps/unix/sysv/linux/preadv64v2.c
+++ b/sysdeps/unix/sysv/linux/preadv64v2.c
@@ -30,7 +30,7 @@ preadv64v2 (int fd, const struct iovec *vector, int count, off64_t offset,
 #ifdef __NR_preadv64v2
   ssize_t result = SYSCALL_CANCEL (preadv64v2, fd, vector, count,
 				   LO_HI_LONG (offset), flags);
-  if (result >= 0)
+  if (result >= 0 || errno != ENOSYS)
     return result;
 #endif
   /* Trying to emulate the preadv2 syscall flags is troublesome:
diff --git a/sysdeps/unix/sysv/linux/pwritev2.c b/sysdeps/unix/sysv/linux/pwritev2.c
index 29c2264c8f..26333ebd43 100644
--- a/sysdeps/unix/sysv/linux/pwritev2.c
+++ b/sysdeps/unix/sysv/linux/pwritev2.c
@@ -28,7 +28,7 @@ pwritev2 (int fd, const struct iovec *vector, int count, off_t offset,
 # ifdef __NR_pwritev2
   ssize_t result = SYSCALL_CANCEL (pwritev2, fd, vector, count,
 				   LO_HI_LONG (offset), flags);
-  if (result >= 0)
+  if (result >= 0 || errno != ENOSYS)
     return result;
 # endif
   /* Trying to emulate the pwritev2 syscall flags is troublesome:
diff --git a/sysdeps/unix/sysv/linux/pwritev64v2.c b/sysdeps/unix/sysv/linux/pwritev64v2.c
index 42da321149..17ea905aa6 100644
--- a/sysdeps/unix/sysv/linux/pwritev64v2.c
+++ b/sysdeps/unix/sysv/linux/pwritev64v2.c
@@ -30,7 +30,7 @@ pwritev64v2 (int fd, const struct iovec *vector, int count, off64_t offset,
 #ifdef __NR_pwritev64v2
   ssize_t result = SYSCALL_CANCEL (pwritev64v2, fd, vector, count,
 				   LO_HI_LONG (offset), flags);
-  if (result >= 0)
+  if (result >= 0 || errno != ENOSYS)
     return result;
 #endif
   /* Trying to emulate the pwritev2 syscall flags is troublesome:
-- 
2.17.1