جزئیات آسیب‌پذیری

In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Fix the case that vm range is hole at svm_migrate_copy_to_vram When migration vm range is hole at cpu side(MIGRATE_PFN_MIGRATE set + MIGRATE_PFN_VALID unset) driver still allocates device pages. There is no dma map of src pages and migration. j is 0 and svm_migrate_copy_memory_gart() will return an uninitialized r. That can trigger out_free_vram_pages to drop all VRAM just set up. Initialize r and only call the last svm_migrate_copy_memory_gart if j > 0. Current code postponed the last page to the final copy. This patch flushes on the last page when reach to the end of current drm_buddy_block; avoids another svm_migrate_copy_memory_gart.

• https://git.kernel.org/stable/c/d5872c81c70163a3ba9eb4da9a94c92b03067576
• https://git.kernel.org/stable/c/6e1a6f3ddb87d7f89a775c55fb399680c02bdcc2
• https://git.kernel.org/stable/c/bd1adb2e5101db649121b59e601c92773a302a70
• https://git.kernel.org/stable/c/ae806a95b28fcecb913430cfa45a252e91a945d6
• https://git.kernel.org/stable/c/0a9a0e8a97da70a0336c9115178aaf1be29bcfb1
• https://git.kernel.org/stable/c/520e345ffe05aabef1db82beda4288afb1757ff2