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arch: arm: userspace: fix syscall ID validation #23535

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merged 1 commit into from Mar 24, 2020
Merged

arch: arm: userspace: fix syscall ID validation #23535

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5 changes: 4 additions & 1 deletion arch/arm/core/swap_helper.S
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Expand Up @@ -411,7 +411,10 @@ _do_syscall:
/* validate syscall limit */
ldr ip, =K_SYSCALL_LIMIT
cmp r6, ip
blt valid_syscall_id
/* The supplied syscall_id must be lower than the limit
* (Requires unsigned integer comparison)
*/
blo valid_syscall_id

/* bad syscall id. Set arg1 to bad id and set call_id to SYSCALL_BAD */
str r6, [r0, #0]
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