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author | David S. Miller <davem@davemloft.net> | 2018-05-26 19:46:15 -0400 |
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committer | David S. Miller <davem@davemloft.net> | 2018-05-26 19:46:15 -0400 |
commit | 5b79c2af667c0e2684f2a6dbf6439074b78f490c (patch) | |
tree | efda2b94317c914fef0bfb25fe5ada9e253d5415 /ipc/shm.c | |
parent | e52cde71709348c0d67bf0f213b438fa4d6cf9a9 (diff) | |
parent | bc2dbc5420e82560e650f8531ceca597441ca171 (diff) | |
download | linux-5b79c2af667c0e2684f2a6dbf6439074b78f490c.tar.bz2 |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Lots of easy overlapping changes in the confict
resolutions here.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'ipc/shm.c')
-rw-r--r-- | ipc/shm.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/ipc/shm.c b/ipc/shm.c index 3cf48988d68c..d73269381ec7 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -1363,14 +1363,17 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, if (addr) { if (addr & (shmlba - 1)) { - /* - * Round down to the nearest multiple of shmlba. - * For sane do_mmap_pgoff() parameters, avoid - * round downs that trigger nil-page and MAP_FIXED. - */ - if ((shmflg & SHM_RND) && addr >= shmlba) - addr &= ~(shmlba - 1); - else + if (shmflg & SHM_RND) { + addr &= ~(shmlba - 1); /* round down */ + + /* + * Ensure that the round-down is non-nil + * when remapping. This can happen for + * cases when addr < shmlba. + */ + if (!addr && (shmflg & SHM_REMAP)) + goto out; + } else #ifndef __ARCH_FORCE_SHMLBA if (addr & ~PAGE_MASK) #endif |