fkie_cve-2021-47496
Vulnerability from fkie_nvd
Published
2024-05-22 09:15
Modified
2024-11-21 06:36
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/tls: Fix flipped sign in tls_err_abort() calls sk->sk_err appears to expect a positive value, a convention that ktls doesn't always follow and that leads to memory corruption in other code. For instance, [kworker] tls_encrypt_done(..., err=<negative error from crypto request>) tls_err_abort(.., err) sk->sk_err = err; [task] splice_from_pipe_feed ... tls_sw_do_sendpage if (sk->sk_err) { ret = -sk->sk_err; // ret is positive splice_from_pipe_feed (continued) ret = actor(...) // ret is still positive and interpreted as bytes // written, resulting in underflow of buf->len and // sd->len, leading to huge buf->offset and bogus // addresses computed in later calls to actor() Fix all tls_err_abort() callers to pass a negative error code consistently and centralize the error-prone sign flip there, throwing in a warning to catch future misuse and uninlining the function so it really does only warn once.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da353fac65fede6b8b4cfe207f0d9408e3121105
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e0cfd5159f314d6b304d030363650b06a2299cbb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e41473543f75f7dbc5d605007e6f883f1bd13b9a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f3dec7e7ace38224f82cf83f0049159d067c2e19
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/da353fac65fede6b8b4cfe207f0d9408e3121105
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e0cfd5159f314d6b304d030363650b06a2299cbb
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e41473543f75f7dbc5d605007e6f883f1bd13b9a
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f3dec7e7ace38224f82cf83f0049159d067c2e19
Impacted products
Vendor Product Version


To clipboard 

{
   cveTags: [],
   descriptions: [
      {
         lang: "en",
         value: "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/tls: Fix flipped sign in tls_err_abort() calls\n\nsk->sk_err appears to expect a positive value, a convention that ktls\ndoesn't always follow and that leads to memory corruption in other code.\nFor instance,\n\n    [kworker]\n    tls_encrypt_done(..., err=<negative error from crypto request>)\n      tls_err_abort(.., err)\n        sk->sk_err = err;\n\n    [task]\n    splice_from_pipe_feed\n      ...\n        tls_sw_do_sendpage\n          if (sk->sk_err) {\n            ret = -sk->sk_err;  // ret is positive\n\n    splice_from_pipe_feed (continued)\n      ret = actor(...)  // ret is still positive and interpreted as bytes\n                        // written, resulting in underflow of buf->len and\n                        // sd->len, leading to huge buf->offset and bogus\n                        // addresses computed in later calls to actor()\n\nFix all tls_err_abort() callers to pass a negative error code\nconsistently and centralize the error-prone sign flip there, throwing in\na warning to catch future misuse and uninlining the function so it\nreally does only warn once.",
      },
      {
         lang: "es",
         value: "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/tls: corrige las llamadas invertidas de tls_err_abort() sk-&gt;sk_err parece esperar un valor positivo, una convención que ktls no siempre sigue y que conduce a daños en la memoria en otro código. Por ejemplo, [kworker] tls_encrypt_done(..., err=) tls_err_abort(.., err) sk-&gt;sk_err = err; [tarea] splice_from_pipe_feed ... tls_sw_do_sendpage if (sk-&gt;sk_err) { ret = -sk-&gt;sk_err; // ret es positivo splice_from_pipe_feed (continuación) ret = actor(...) // ret sigue siendo positivo y se interpreta como bytes // escritos, lo que resulta en un desbordamiento insuficiente de buf-&gt;len y // sd-&gt;len, lo que genera enormes buf-&gt;offset y bogus // direcciones calculadas en llamadas posteriores a actor(). Repare todas las llamadas tls_err_abort() para que pasen un código de error negativo de manera consistente y centralice el cambio de señal propenso a errores allí, lanzando una advertencia para detectar futuros usos indebidos y eliminación de líneas. la función por lo que realmente solo advierte una vez.",
      },
   ],
   id: "CVE-2021-47496",
   lastModified: "2024-11-21T06:36:20.093",
   metrics: {},
   published: "2024-05-22T09:15:11.447",
   references: [
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         url: "https://git.kernel.org/stable/c/da353fac65fede6b8b4cfe207f0d9408e3121105",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         url: "https://git.kernel.org/stable/c/e0cfd5159f314d6b304d030363650b06a2299cbb",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         url: "https://git.kernel.org/stable/c/e41473543f75f7dbc5d605007e6f883f1bd13b9a",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         url: "https://git.kernel.org/stable/c/f3dec7e7ace38224f82cf83f0049159d067c2e19",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://git.kernel.org/stable/c/da353fac65fede6b8b4cfe207f0d9408e3121105",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://git.kernel.org/stable/c/e0cfd5159f314d6b304d030363650b06a2299cbb",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://git.kernel.org/stable/c/e41473543f75f7dbc5d605007e6f883f1bd13b9a",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://git.kernel.org/stable/c/f3dec7e7ace38224f82cf83f0049159d067c2e19",
      },
   ],
   sourceIdentifier: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
   vulnStatus: "Awaiting Analysis",
}


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