From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from madras.collabora.co.uk (madras.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e5ab]) by gabe.freedesktop.org (Postfix) with ESMTPS id 8842310E052 for ; Wed, 8 Nov 2023 06:29:16 +0000 (UTC) From: Vignesh Raman To: bhanuprakash.modem@intel.com, daniels@collabora.com, igt-dev@lists.freedesktop.org Date: Wed, 8 Nov 2023 11:59:02 +0530 Message-Id: <20231108062902.390248-1-vignesh.raman@collabora.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [igt-dev] [PATCH i-g-t v3] lib/igt_kms: Fix memory corruption List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: helen.koike@collabora.com Errors-To: igt-dev-bounces@lists.freedesktop.org Sender: "igt-dev" List-ID: In crosvm, the kernel reports 16 for count_crtcs, which exceeds IGT_MAX_PIPES set to 8. The function igt_display_require allocates memory for IGT_MAX_PIPES members of igt_pipe_t structures, but then writes into it based on the count_crtcs reported by the kernel, resulting in memory corruption. # malloc(): corrupted top size # Received signal SIGABRT. # Stack trace: # #0 [fatal_sig_handler+0x17b] # #1 [__sigaction+0x40] # #2 [pthread_key_delete+0x14c] # #3 [gsignal+0x12] # #4 [abort+0xd3] # #5 [__fsetlocking+0x290] # #6 [timer_settime+0x37a] # #7 [__default_morecore+0x1f1b] # #8 [__libc_calloc+0x161] # #9 [drmModeGetPlaneResources+0x44] # #10 [igt_display_require+0x194] # #11 [__igt_unique____real_main1356+0x93c] # #12 [main+0x3f] # #13 [__libc_init_first+0x8a] # #14 [__libc_start_main+0x85] # #15 [_start+0x21] Increase IGT_MAX_PIPES to 16 to fix this memory corruption issue. igt_display_require initializes display and allocate resources as a prerequisite for the tests. Fail the test if count_crtcs exceeds IGT_MAX_PIPES with debug information. This fix is required for drm-ci to run igt tests on virtio-gpu. Suggested-by: Daniel Stone Suggested-by: Bhanuprakash Modem Signed-off-by: Vignesh Raman --- v2: - Rework the fix to increase IGT_MAX_PIPES to 16 v3: - Fail the test if count_crtcs exceeds IGT_MAX_PIPES with debug information --- lib/igt_kms.c | 6 +++++- lib/igt_kms.h | 20 +++++++++++++++++++- 2 files changed, 24 insertions(+), 2 deletions(-) diff --git a/lib/igt_kms.c b/lib/igt_kms.c index 453103f90..6ad7cc127 100644 --- a/lib/igt_kms.c +++ b/lib/igt_kms.c @@ -906,7 +906,7 @@ static igt_plane_t *igt_get_assigned_primary(igt_output_t *output, igt_pipe_t *p */ const char *kmstest_pipe_name(enum pipe pipe) { - static const char str[] = "A\0B\0C\0D\0E\0F\0G\0H"; + static const char str[] = "A\0B\0C\0D\0E\0F\0G\0H\0I\0J\0K\0L\0M\0N\0O\0P"; _Static_assert(sizeof(str) == IGT_MAX_PIPES * 2, "Missing pipe name"); @@ -2770,6 +2770,10 @@ void igt_display_require(igt_display_t *display, int drm_fd) } #endif + igt_assert_f(resources->count_crtcs <= IGT_MAX_PIPES, + "count_crtcs exceeds IGT_MAX_PIPES, resources->count_crtcs=%d, IGT_MAX_PIPES=%d\n", + resources->count_crtcs, IGT_MAX_PIPES); + display->n_pipes = IGT_MAX_PIPES; display->pipes = calloc(sizeof(igt_pipe_t), display->n_pipes); igt_assert_f(display->pipes, "Failed to allocate memory for %d pipes\n", display->n_pipes); diff --git a/lib/igt_kms.h b/lib/igt_kms.h index 9028ab9be..5c705b585 100644 --- a/lib/igt_kms.h +++ b/lib/igt_kms.h @@ -57,6 +57,16 @@ * @PIPE_D: Fourth crtc. * @PIPE_E: Fifth crtc. * @PIPE_F: Sixth crtc. + * @PIPE_G: Seventh crtc. + * @PIPE_H: Eighth crtc. + * @PIPE_I: Ninth crtc. + * @PIPE_J: Tenth crtc. + * @PIPE_K: Eleventh crtc. + * @PIPE_L: Twelfth crtc. + * @PIPE_M: Thirteenth crtc. + * @PIPE_N: Fourteenth crtc. + * @PIPE_O: Fifteenth crtc. + * @PIPE_P: Sixteenth crtc. * @IGT_MAX_PIPES: Max number of pipes allowed. */ enum pipe { @@ -70,7 +80,15 @@ enum pipe { PIPE_F, PIPE_G, PIPE_H, - IGT_MAX_PIPES + PIPE_I, + PIPE_J, + PIPE_K, + PIPE_L, + PIPE_M, + PIPE_N, + PIPE_O, + PIPE_P, + IGT_MAX_PIPES }; const char *kmstest_pipe_name(enum pipe pipe); int kmstest_pipe_to_index(char pipe); -- 2.40.1