dmabuf: use spinlock to access dmabuf->name
[ Upstream commit 6348dd291e
]
There exists a sleep-while-atomic bug while accessing the dmabuf->name
under mutex in the dmabuffs_dname(). This is caused from the SELinux
permissions checks on a process where it tries to validate the inherited
files from fork() by traversing them through iterate_fd() (which
traverse files under spin_lock) and call
match_file(security/selinux/hooks.c) where the permission checks happen.
This audit information is logged using dump_common_audit_data() where it
calls d_path() to get the file path name. If the file check happen on
the dmabuf's fd, then it ends up in ->dmabuffs_dname() and use mutex to
access dmabuf->name. The flow will be like below:
flush_unauthorized_files()
iterate_fd()
spin_lock() --> Start of the atomic section.
match_file()
file_has_perm()
avc_has_perm()
avc_audit()
slow_avc_audit()
common_lsm_audit()
dump_common_audit_data()
audit_log_d_path()
d_path()
dmabuffs_dname()
mutex_lock()--> Sleep while atomic.
Call trace captured (on 4.19 kernels) is below:
___might_sleep+0x204/0x208
__might_sleep+0x50/0x88
__mutex_lock_common+0x5c/0x1068
__mutex_lock_common+0x5c/0x1068
mutex_lock_nested+0x40/0x50
dmabuffs_dname+0xa0/0x170
d_path+0x84/0x290
audit_log_d_path+0x74/0x130
common_lsm_audit+0x334/0x6e8
slow_avc_audit+0xb8/0xf8
avc_has_perm+0x154/0x218
file_has_perm+0x70/0x180
match_file+0x60/0x78
iterate_fd+0x128/0x168
selinux_bprm_committing_creds+0x178/0x248
security_bprm_committing_creds+0x30/0x48
install_exec_creds+0x1c/0x68
load_elf_binary+0x3a4/0x14e0
search_binary_handler+0xb0/0x1e0
So, use spinlock to access dmabuf->name to avoid sleep-while-atomic.
Cc: <stable@vger.kernel.org> [5.3+]
Signed-off-by: Charan Teja Kalla <charante@codeaurora.org>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Acked-by: Christian König <christian.koenig@amd.com>
[sumits: added comment to spinlock_t definition to avoid warning]
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/a83e7f0d-4e54-9848-4b58-e1acdbe06735@codeaurora.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
parent
44838b9563
commit
722c6e954c
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@ -45,10 +45,10 @@ static char *dmabuffs_dname(struct dentry *dentry, char *buffer, int buflen)
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size_t ret = 0;
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dmabuf = dentry->d_fsdata;
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mutex_lock(&dmabuf->lock);
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spin_lock(&dmabuf->name_lock);
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if (dmabuf->name)
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ret = strlcpy(name, dmabuf->name, DMA_BUF_NAME_LEN);
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mutex_unlock(&dmabuf->lock);
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spin_unlock(&dmabuf->name_lock);
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return dynamic_dname(dentry, buffer, buflen, "/%s:%s",
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dentry->d_name.name, ret > 0 ? name : "");
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@ -338,8 +338,10 @@ static long dma_buf_set_name(struct dma_buf *dmabuf, const char __user *buf)
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kfree(name);
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goto out_unlock;
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}
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spin_lock(&dmabuf->name_lock);
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kfree(dmabuf->name);
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dmabuf->name = name;
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spin_unlock(&dmabuf->name_lock);
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out_unlock:
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mutex_unlock(&dmabuf->lock);
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@ -402,10 +404,10 @@ static void dma_buf_show_fdinfo(struct seq_file *m, struct file *file)
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/* Don't count the temporary reference taken inside procfs seq_show */
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seq_printf(m, "count:\t%ld\n", file_count(dmabuf->file) - 1);
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seq_printf(m, "exp_name:\t%s\n", dmabuf->exp_name);
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mutex_lock(&dmabuf->lock);
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spin_lock(&dmabuf->name_lock);
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if (dmabuf->name)
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seq_printf(m, "name:\t%s\n", dmabuf->name);
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mutex_unlock(&dmabuf->lock);
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spin_unlock(&dmabuf->name_lock);
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}
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static const struct file_operations dma_buf_fops = {
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@ -537,6 +539,7 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
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dmabuf->size = exp_info->size;
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dmabuf->exp_name = exp_info->exp_name;
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dmabuf->owner = exp_info->owner;
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spin_lock_init(&dmabuf->name_lock);
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init_waitqueue_head(&dmabuf->poll);
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dmabuf->cb_excl.poll = dmabuf->cb_shared.poll = &dmabuf->poll;
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dmabuf->cb_excl.active = dmabuf->cb_shared.active = 0;
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@ -303,6 +303,7 @@ struct dma_buf {
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void *vmap_ptr;
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const char *exp_name;
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const char *name;
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spinlock_t name_lock; /* spinlock to protect name access */
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struct module *owner;
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struct list_head list_node;
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void *priv;
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