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libc: newlib: libc-hooks: Provide our own implementation of __chk_fail() #26135

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Merged
merged 1 commit into from
Jun 17, 2020
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libc: newlib: libc-hooks: Provide our own implementation of __chk_fail() #26135

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12 changes: 12 additions & 0 deletions lib/libc/newlib/libc-hooks.c
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Original file line number Diff line number Diff line change
Expand Up @@ -275,6 +275,18 @@ __weak int *__errno(void)
return z_errno();
}

/* This function gets called if static buffer overflow detection is enabled
* on stdlib side (Newlib here), in case such an overflow is detected. Newlib
* provides an implementation not suitable for us, so we override it here.
*/
__weak FUNC_NORETURN void __chk_fail(void)
{
static const char chk_fail_msg[] = "* buffer overflow detected *\n";
_write(2, chk_fail_msg, sizeof(chk_fail_msg) - 1);
k_oops();
CODE_UNREACHABLE;
}

#if CONFIG_XTENSA
extern int _read(int fd, char *buf, int nbytes);
extern int _open(const char *name, int mode);
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