diff options
Diffstat (limited to 'kernel/sysctl.c')
| -rw-r--r-- | kernel/sysctl.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index f7bd1aead3bf..943c89178e3d 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -3172,9 +3172,13 @@ int proc_do_large_bitmap(struct ctl_table *table, int write, if (write) { char *kbuf, *p; + size_t skipped = 0; - if (left > PAGE_SIZE - 1) + if (left > PAGE_SIZE - 1) { left = PAGE_SIZE - 1; + /* How much of the buffer we'll skip this pass */ + skipped = *lenp - left; + } p = kbuf = memdup_user_nul(buffer, left); if (IS_ERR(kbuf)) @@ -3189,9 +3193,22 @@ int proc_do_large_bitmap(struct ctl_table *table, int write, while (!err && left) { unsigned long val_a, val_b; bool neg; + size_t saved_left; + /* In case we stop parsing mid-number, we can reset */ + saved_left = left; err = proc_get_long(&p, &left, &val_a, &neg, tr_a, sizeof(tr_a), &c); + /* + * If we consumed the entirety of a truncated buffer or + * only one char is left (may be a "-"), then stop here, + * reset, & come back for more. + */ + if ((left <= 1) && skipped) { + left = saved_left; + break; + } + if (err) break; if (val_a >= bitmap_len || neg) { @@ -3209,6 +3226,15 @@ int proc_do_large_bitmap(struct ctl_table *table, int write, err = proc_get_long(&p, &left, &val_b, &neg, tr_b, sizeof(tr_b), &c); + /* + * If we consumed all of a truncated buffer or + * then stop here, reset, & come back for more. + */ + if (!left && skipped) { + left = saved_left; + break; + } + if (err) break; if (val_b >= bitmap_len || neg || @@ -3227,6 +3253,7 @@ int proc_do_large_bitmap(struct ctl_table *table, int write, proc_skip_char(&p, &left, '\n'); } kfree(kbuf); + left += skipped; } else { unsigned long bit_a, bit_b = 0; |