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Message-ID: <TYCP286MB232339970F7009B962E2F1BECA029@TYCP286MB2323.JPNP286.PROD.OUTLOOK.COM>
Date: Sun, 13 Nov 2022 20:42:15 +0800
From: Dawei Li <set_pte_at@...look.com>
To: alexander.deucher@....com, christian.koenig@....com,
Xinhui.Pan@....com
Cc: airlied@...il.com, daniel@...ll.ch, jglisse@...hat.com,
amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, Dawei Li <set_pte_at@...look.com>
Subject: [PATCH] drm/radeon: fix potential racing issue due to mmap_lock
Both find_vma() and get_user_pages() need explicit protection of
mmap lock, fix them by mmap_lock and get_user_pages_fast().
Fixes: ddd00e33e17a ("drm/radeon: add userptr flag to limit it to anonymous memory v2")
Fixes: f72a113a71ab ("drm/radeon: add userptr support v8")
Signed-off-by: Dawei Li <set_pte_at@...look.com>
---
drivers/gpu/drm/radeon/radeon_ttm.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index d33fec488713..741ea64b9402 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -351,7 +351,10 @@ static int radeon_ttm_tt_pin_userptr(struct ttm_device *bdev, struct ttm_tt *ttm
to prevent problems with writeback */
unsigned long end = gtt->userptr + (u64)ttm->num_pages * PAGE_SIZE;
struct vm_area_struct *vma;
+
+ mmap_read_lock(gtt->usermm);
vma = find_vma(gtt->usermm, gtt->userptr);
+ mmap_read_unlock(gtt->usermm);
if (!vma || vma->vm_file || vma->vm_end < end)
return -EPERM;
}
@@ -361,8 +364,7 @@ static int radeon_ttm_tt_pin_userptr(struct ttm_device *bdev, struct ttm_tt *ttm
uint64_t userptr = gtt->userptr + pinned * PAGE_SIZE;
struct page **pages = ttm->pages + pinned;
- r = get_user_pages(userptr, num_pages, write ? FOLL_WRITE : 0,
- pages, NULL);
+ r = get_user_pages_fast(userptr, num_pages, write ? FOLL_WRITE : 0, pages);
if (r < 0)
goto release_pages;
--
2.25.1
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