io_uring-6.5-2023-08-11

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Merge tag 'io_uring-6.5-2023-08-11' of git://git.kernel.dk/linux

Pull io_uring fixes from Jens Axboe:
 "A followup fix for the parisc/SHM_COLOUR fix, also from Helge, which
  is heading to stable.

  And then just the io_uring equivalent of the RESOLVE_CACHED fix in
  commit a0fc452a5d from last week for build_open_flags()"

* tag 'io_uring-6.5-2023-08-11' of git://git.kernel.dk/linux:
  io_uring/parisc: Adjust pgoff in io_uring mmap() for parisc
  io_uring: correct check for O_TMPFILE

arch/parisc/kernel/sys_parisc.c

@@ -27,17 +27,12 @@
 #include <linux/elf-randomize.h>
 
 /*
- * Construct an artificial page offset for the mapping based on the virtual
+ * Construct an artificial page offset for the mapping based on the physical
  * address of the kernel file mapping variable.
- * If filp is zero the calculated pgoff value aliases the memory of the given
- * address. This is useful for io_uring where the mapping shall alias a kernel
- * address and a userspace adress where both the kernel and the userspace
- * access the same memory region.
  */
-#define GET_FILP_PGOFF(filp, addr)		\
-	((filp ? (((unsigned long) filp->f_mapping) >> 8)	\
-		 & ((SHM_COLOUR-1) >> PAGE_SHIFT) : 0UL)	\
-	  + (addr >> PAGE_SHIFT))
+#define GET_FILP_PGOFF(filp)		\
+	(filp ? (((unsigned long) filp->f_mapping) >> 8)	\
+		 & ((SHM_COLOUR-1) >> PAGE_SHIFT) : 0UL)
 
 static unsigned long shared_align_offset(unsigned long filp_pgoff,
 					 unsigned long pgoff)
@@ -117,7 +112,7 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp,
 	do_color_align = 0;
 	if (filp || (flags & MAP_SHARED))
 		do_color_align = 1;
-	filp_pgoff = GET_FILP_PGOFF(filp, addr);
+	filp_pgoff = GET_FILP_PGOFF(filp);
 
 	if (flags & MAP_FIXED) {
 		/* Even MAP_FIXED mappings must reside within TASK_SIZE */

io_uring/io_uring.c

@@ -3470,6 +3470,8 @@ static unsigned long io_uring_mmu_get_unmapped_area(struct file *filp,
 	 * - use the kernel virtual address of the shared io_uring context
 	 *   (instead of the userspace-provided address, which has to be 0UL
 	 *   anyway).
+	 * - use the same pgoff which the get_unmapped_area() uses to
+	 *   calculate the page colouring.
 	 * For architectures without such aliasing requirements, the
 	 * architecture will return any suitable mapping because addr is 0.
 	 */
@@ -3478,6 +3480,7 @@ static unsigned long io_uring_mmu_get_unmapped_area(struct file *filp,
 	pgoff = 0;	/* has been translated to ptr above */
 #ifdef SHM_COLOUR
 	addr = (uintptr_t) ptr;
+	pgoff = addr >> PAGE_SHIFT;
 #else
 	addr = 0UL;
 #endif

io_uring/openclose.c

@@ -35,9 +35,11 @@ static bool io_openat_force_async(struct io_open *open)
 {
 	/*
 	 * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open,
-	 * it'll always -EAGAIN
+	 * it'll always -EAGAIN. Note that we test for __O_TMPFILE because
+	 * O_TMPFILE includes O_DIRECTORY, which isn't a flag we need to force
+	 * async for.
 	 */
-	return open->how.flags & (O_TRUNC | O_CREAT | O_TMPFILE);
+	return open->how.flags & (O_TRUNC | O_CREAT | __O_TMPFILE);
 }
 
 static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)