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aarch64: fatal: Restrict oops-es when in user-mode

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User mode is only allowed to induce oopses and stack check failures via
software-triggered system fatal exceptions.

Signed-off-by: Carlo Caione <ccaione@baylibre.com>
This commit is contained in:
Carlo Caione 2020-11-19 12:27:48 +01:00 • committed by Anas Nashif
commit a7a3e800bf
1 changed files with 11 additions and 0 deletions
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11
arch/arm/core/aarch64/fatal.c
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@ -235,6 +235,17 @@ void z_arm64_do_kernel_oops(z_arch_esf_t *esf)
/* x8 holds the exception reason */ /* x8 holds the exception reason */
unsigned int reason = esf->x8; unsigned int reason = esf->x8;
#if defined(CONFIG_USERSPACE)
/*
* User mode is only allowed to induce oopses and stack check
* failures via software-triggered system fatal exceptions.
*/
if (((_current->base.user_options & K_USER) != 0) &&
reason != K_ERR_STACK_CHK_FAIL) {
reason = K_ERR_KERNEL_OOPS;
}
#endif
z_arm64_fatal_error(reason, esf); z_arm64_fatal_error(reason, esf);
} }