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d8bdd795d3
security_setselfattr() has an integer overflow bug that leads to
out-of-bounds access when userspace provides bogus input:
`lctx->ctx_len + sizeof(*lctx)` is checked against `lctx->len` (and,
redundantly, also against `size`), but there are no checks on
`lctx->ctx_len`.
Therefore, userspace can provide an `lsm_ctx` with `->ctx_len` set to a
value between `-sizeof(struct lsm_ctx)` and -1, and this bogus `->ctx_len`
will then be passed to an LSM module as a buffer length, causing LSM
modules to perform out-of-bounds accesses.
The following reproducer will demonstrate this under ASAN (if AppArmor is
loaded as an LSM):
```
struct lsm_ctx {
uint64_t id;
uint64_t flags;
uint64_t len;
uint64_t ctx_len;
char ctx[];
};
int main(void) {
size_t size = sizeof(struct lsm_ctx);
struct lsm_ctx *ctx = malloc(size);
ctx->id = 104/*LSM_ID_APPARMOR*/;
ctx->flags = 0;
ctx->len = size;
ctx->ctx_len = -sizeof(struct lsm_ctx);
syscall(
460/*__NR_lsm_set_self_attr*/,
/*attr=*/ 100/*LSM_ATTR_CURRENT*/,
/*ctx=*/ ctx,
/*size=*/ size,
/*flags=*/ 0
);
}
```
Fixes:
|
History
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
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| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.