The commit 00b7c3395aec3df43de5bd02a3c5a099ca51169f "sysctl: refactor integer handling proc code" modified the behaviour of writing to /proc. Before the commit, write("1\n") to /proc/sys/kernel/printk succeeded. But now it returns EINVAL. This commit supports writing a single value to a multi-valued entry.
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| @@ -2253,6 +2253,8 @@ static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, · 2252 unmodified lines | ||
| 2253 | 2253 | if (write) { |
| 2254 | 2254 | left -= proc_skip_spaces(&kbuf); |
| 2255 | 2255 | |
| 2256 | + if (!left) | |
| 2257 | + break; | |
| 2256 | 2258 | err = proc_get_long(&kbuf, &left, &lval, &neg, |
| 2257 | 2259 | proc_wspace_sep, |
| 2258 | 2260 | sizeof(proc_wspace_sep), NULL); |
| @@ -2279,7 +2281,7 @@ static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, · 20 unmodified lines | ||
| 2279 | 2281 | |
| 2280 | 2282 | if (!write && !first && left && !err) |
| 2281 | 2283 | err = proc_put_char(&buffer, &left, '\n'); |
| 2282 | − if (write && !err) | |
| 2284 | + if (write && !err && left) | |
| 2283 | 2285 | left -= proc_skip_spaces(&kbuf); |
| 2284 | 2286 | free: |
| 2285 | 2287 | if (write) { |