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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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242ece22f0
When "cp >= barg_buf + BARG_LEN-2", it breaks internel looping 'while', but outside loop 'for' still has effect, so "*cp++ = ' '" will continue repeating which may cause memory overflow. So need additional length check for it in the outside looping. Also beautify the related code which found by "./scripts/checkpatch.pl" Signed-off-by: Chen Gang <gang.chen@asianux.com> Signed-off-by: David S. Miller <davem@davemloft.net>
63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
/*
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* bootstr.c: Boot string/argument acquisition from the PROM.
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*
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* Copyright(C) 1995 David S. Miller (davem@caip.rutgers.edu)
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*/
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#include <linux/string.h>
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#include <asm/oplib.h>
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#include <linux/init.h>
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#define BARG_LEN 256
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static char barg_buf[BARG_LEN] = { 0 };
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static char fetched __initdata = 0;
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char * __init
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prom_getbootargs(void)
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{
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int iter;
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char *cp, *arg;
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/* This check saves us from a panic when bootfd patches args. */
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if (fetched) {
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return barg_buf;
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}
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switch (prom_vers) {
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case PROM_V0:
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cp = barg_buf;
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/* Start from 1 and go over fd(0,0,0)kernel */
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for (iter = 1; iter < 8; iter++) {
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arg = (*(romvec->pv_v0bootargs))->argv[iter];
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if (arg == NULL)
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break;
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while (*arg != 0) {
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/* Leave place for space and null. */
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if (cp >= barg_buf + BARG_LEN - 2)
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/* We might issue a warning here. */
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break;
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*cp++ = *arg++;
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}
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*cp++ = ' ';
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if (cp >= barg_buf + BARG_LEN - 1)
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/* We might issue a warning here. */
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break;
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}
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*cp = 0;
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break;
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case PROM_V2:
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case PROM_V3:
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/*
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* V3 PROM cannot supply as with more than 128 bytes
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* of an argument. But a smart bootstrap loader can.
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*/
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strlcpy(barg_buf, *romvec->pv_v2bootargs.bootargs, sizeof(barg_buf));
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break;
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default:
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break;
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}
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fetched = 1;
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return barg_buf;
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}
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