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    Subject[PATCH 6.0 730/862] drm: Prevent drm_copy_field() to attempt copying a NULL pointer
    Date
    From: Javier Martinez Canillas <javierm@redhat.com>

    [ Upstream commit f6ee30407e883042482ad4ad30da5eaba47872ee ]

    There are some struct drm_driver fields that are required by drivers since
    drm_copy_field() attempts to copy them to user-space via DRM_IOCTL_VERSION.

    But it can be possible that a driver has a bug and did not set some of the
    fields, which leads to drm_copy_field() attempting to copy a NULL pointer:

    [ +10.395966] Unable to handle kernel access to user memory outside uaccess routines at virtual address 0000000000000000
    [ +0.010955] Mem abort info:
    [ +0.002835] ESR = 0x0000000096000004
    [ +0.003872] EC = 0x25: DABT (current EL), IL = 32 bits
    [ +0.005395] SET = 0, FnV = 0
    [ +0.003113] EA = 0, S1PTW = 0
    [ +0.003182] FSC = 0x04: level 0 translation fault
    [ +0.004964] Data abort info:
    [ +0.002919] ISV = 0, ISS = 0x00000004
    [ +0.003886] CM = 0, WnR = 0
    [ +0.003040] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000115dad000
    [ +0.006536] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000
    [ +0.006925] Internal error: Oops: 96000004 [#1] SMP
    ...
    [ +0.011113] pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
    [ +0.007061] pc : __pi_strlen+0x14/0x150
    [ +0.003895] lr : drm_copy_field+0x30/0x1a4
    [ +0.004156] sp : ffff8000094b3a50
    [ +0.003355] x29: ffff8000094b3a50 x28: ffff8000094b3b70 x27: 0000000000000040
    [ +0.007242] x26: ffff443743c2ba00 x25: 0000000000000000 x24: 0000000000000040
    [ +0.007243] x23: ffff443743c2ba00 x22: ffff8000094b3b70 x21: 0000000000000000
    [ +0.007241] x20: 0000000000000000 x19: ffff8000094b3b90 x18: 0000000000000000
    [ +0.007241] x17: 0000000000000000 x16: 0000000000000000 x15: 0000aaab14b9af40
    [ +0.007241] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000
    [ +0.007239] x11: 0000000000000000 x10: 0000000000000000 x9 : ffffa524ad67d4d8
    [ +0.007242] x8 : 0101010101010101 x7 : 7f7f7f7f7f7f7f7f x6 : 6c6e6263606e7141
    [ +0.007239] x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000
    [ +0.007241] x2 : 0000000000000000 x1 : ffff8000094b3b90 x0 : 0000000000000000
    [ +0.007240] Call trace:
    [ +0.002475] __pi_strlen+0x14/0x150
    [ +0.003537] drm_version+0x84/0xac
    [ +0.003448] drm_ioctl_kernel+0xa8/0x16c
    [ +0.003975] drm_ioctl+0x270/0x580
    [ +0.003448] __arm64_sys_ioctl+0xb8/0xfc
    [ +0.003978] invoke_syscall+0x78/0x100
    [ +0.003799] el0_svc_common.constprop.0+0x4c/0xf4
    [ +0.004767] do_el0_svc+0x38/0x4c
    [ +0.003357] el0_svc+0x34/0x100
    [ +0.003185] el0t_64_sync_handler+0x11c/0x150
    [ +0.004418] el0t_64_sync+0x190/0x194
    [ +0.003716] Code: 92402c04 b200c3e8 f13fc09f 5400088c (a9400c02)
    [ +0.006180] ---[ end trace 0000000000000000 ]---

    Reported-by: Peter Robinson <pbrobinson@gmail.com>
    Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
    Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
    Link: https://patchwork.freedesktop.org/patch/msgid/20220705100215.572498-3-javierm@redhat.com
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/gpu/drm/drm_ioctl.c | 6 ++++++
    1 file changed, 6 insertions(+)

    diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
    index e1b9a03e619c..ca2a6e6101dc 100644
    --- a/drivers/gpu/drm/drm_ioctl.c
    +++ b/drivers/gpu/drm/drm_ioctl.c
    @@ -474,6 +474,12 @@ static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value)
    {
    size_t len;

    + /* don't attempt to copy a NULL pointer */
    + if (WARN_ONCE(!value, "BUG: the value to copy was not set!")) {
    + *buf_len = 0;
    + return 0;
    + }
    +
    /* don't overflow userbuf */
    len = strlen(value);
    if (len > *buf_len)
    --
    2.35.1


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