Add bpf_getxattr #3189
Add bpf_getxattr #3189
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This allows to declare a kfunc as sleepable and prevents its use in a non sleepable program. Acked-by: KP Singh <kpsingh@kernel.org> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: KP Singh <kpsingh@kernel.org>
kfuncs can handle pointers to memory when the next argument is the size of the memory that can be read and verify these as ARG_CONST_SIZE_OR_ZERO Similarly add support for string constants (const char *) and verify it similar to ARG_PTR_TO_CONST_STR. Signed-off-by: KP Singh <kpsingh@kernel.org>
In preparation for the addition of bpf_getxattr kfunc. Signed-off-by: KP Singh <kpsingh@kernel.org>
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LSMs like SELinux store security state in xattrs. bpf_getxattr enables BPF LSM to implement similar functionality. In combination with bpf_local_storage, xattrs can be used to develop more complex security policies. This kfunc wraps around __vfs_getxattr which can sleep and is, therefore, limited to sleepable programs using the newly added sleepable_set for kfuncs. Signed-off-by: KP Singh <kpsingh@kernel.org>
A simple test that adds an xattr on a copied /bin/ls and reads it back when the copied ls is executed. Signed-off-by: KP Singh <kpsingh@kernel.org>
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=653430 expired. Closing PR. |
Pull request for series with
subject: Add bpf_getxattr
version: 2
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=652161