a0dbcf8b8f
The blob buffer has no limitation in place to prevent buflen to exceed maximum size. This commit adds a test to demonstrate how a blob increases past the maximum allowd size of 16MB. It continuously adds chunks of 64KB and with the 255th one blob_add() returns a valid attribute pointer but the blob's buflen does not increase. The test is used to demonstrate the failure, which is fixed with a follow-up commit. Signed-off-by: Zefir Kurtisi <zefir.kurtisi@gmail.com> [adjusted test case for cram usage] Signed-off-by: Petr Štetiar <ynezz@true.cz>
31 lines
696 B
C
31 lines
696 B
C
#include <stdio.h>
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#include "blobmsg.h"
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/* chunks of 64KB to be added to blob-buffer */
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#define BUFF_SIZE 0x10000
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/* exceed maximum blob buff-length */
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#define BUFF_CHUNKS (((BLOB_ATTR_LEN_MASK + 1) / BUFF_SIZE) + 1)
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int main(int argc, char **argv)
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{
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int i;
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static struct blob_buf buf;
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blobmsg_buf_init(&buf);
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int prev_len = buf.buflen;
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for (i = 0; i < BUFF_CHUNKS; i++) {
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struct blob_attr *attr = blob_new(&buf, 0, BUFF_SIZE);
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if (!attr) {
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fprintf(stderr, "SUCCESS: failed to allocate attribute\n");
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break;
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}
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if (prev_len < buf.buflen) {
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prev_len = buf.buflen;
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continue;
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}
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fprintf(stderr, "ERROR: buffer length did not increase\n");
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return -1;
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}
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return 0;
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}
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