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cmd/pxe.c: Rework initrd and bootargs handling slightly

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For the initrd portion of handling our bootm arguments we do not have a
sufficiently long enough buffer for some improbable 64bit cases.  Expand
this buffer to allow for a 64bit address and almost 256MB initrd to be
used.  Make use of strncpy/strncat when constructing the values here
since we know what the worst case valid values are, length wise.

Similarly for bootargs themselves, we need to make use of strlen/sizeof
and strncpy/strncat to ensure that we don't overflow bootargs itself.

Cc: Simon Glass <sjg@chromium.org>
Cc: Alexander Graf <agraf@suse.de>
Reported-by: Coverity (CID: 131256)
Signed-off-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Tom Rini 2017-09-26 20:44:32 -04:00
parent c667723ffb
commit 48ee0a87bc
1 changed files with 6 additions and 6 deletions
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12
cmd/pxe.c
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@ -616,7 +616,7 @@ static int label_localboot(struct pxe_label *label)
static int label_boot(cmd_tbl_t *cmdtp, struct pxe_label *label) static int label_boot(cmd_tbl_t *cmdtp, struct pxe_label *label)
{ {
char *bootm_argv[] = { "bootm", NULL, NULL, NULL, NULL }; char *bootm_argv[] = { "bootm", NULL, NULL, NULL, NULL };
char initrd_str[22]; char initrd_str[28];
char mac_str[29] = ""; char mac_str[29] = "";
char ip_str[68] = ""; char ip_str[68] = "";
int bootm_argc = 2; int bootm_argc = 2;
@ -648,9 +648,9 @@ static int label_boot(cmd_tbl_t *cmdtp, struct pxe_label *label)
} }
bootm_argv[2] = initrd_str; bootm_argv[2] = initrd_str;
strcpy(bootm_argv[2], env_get("ramdisk_addr_r")); strncpy(bootm_argv[2], env_get("ramdisk_addr_r"), 18);
strcat(bootm_argv[2], ":"); strcat(bootm_argv[2], ":");
strcat(bootm_argv[2], env_get("filesize")); strncat(bootm_argv[2], env_get("filesize"), 9);
} }
if (get_relfile_envaddr(cmdtp, label->kernel, "kernel_addr_r") < 0) { if (get_relfile_envaddr(cmdtp, label->kernel, "kernel_addr_r") < 0) {
@ -689,9 +689,9 @@ static int label_boot(cmd_tbl_t *cmdtp, struct pxe_label *label)
} }
if (label->append) if (label->append)
strcpy(bootargs, label->append); strncpy(bootargs, label->append, sizeof(bootargs));
strcat(bootargs, ip_str); strncat(bootargs, ip_str, sizeof(bootargs) - strlen(bootargs));
strcat(bootargs, mac_str); strncat(bootargs, mac_str, sizeof(bootargs) - strlen(bootargs));
cli_simple_process_macros(bootargs, finalbootargs); cli_simple_process_macros(bootargs, finalbootargs);
env_set("bootargs", finalbootargs); env_set("bootargs", finalbootargs);