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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-11-20 13:17:24 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-11-20 13:17:24 -0800 |
| commit | 923dcc5eb0c111eccd51cc7ce1658537e3c38b25 (patch) | |
| tree | 810cbaeaedeed0c7e40975342f9bf0a0972da8bf /fs | |
| parent | 61564e7b3abcb67d57b09afdb4b14b85f8bc1976 (diff) | |
| parent | c1e63117711977cc4295b2ce73de29dd17066c82 (diff) | |
| download | linux-stable-923dcc5eb0c111eccd51cc7ce1658537e3c38b25.tar.gz linux-stable-923dcc5eb0c111eccd51cc7ce1658537e3c38b25.tar.bz2 linux-stable-923dcc5eb0c111eccd51cc7ce1658537e3c38b25.zip | |
Merge branch 'akpm' (patches from Andrew)
Merge misc fixes from Andrew Morton:
"15 patches.
Subsystems affected by this patch series: ipc, hexagon, mm (swap,
slab-generic, kmemleak, hugetlb, kasan, damon, and highmem), and proc"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
proc/vmcore: fix clearing user buffer by properly using clear_user()
kmap_local: don't assume kmap PTEs are linear arrays in memory
mm/damon/dbgfs: fix missed use of damon_dbgfs_lock
mm/damon/dbgfs: use '__GFP_NOWARN' for user-specified size buffer allocation
kasan: test: silence intentional read overflow warnings
hugetlb, userfaultfd: fix reservation restore on userfaultfd error
hugetlb: fix hugetlb cgroup refcounting during mremap
mm: kmemleak: slob: respect SLAB_NOLEAKTRACE flag
hexagon: ignore vmlinux.lds
hexagon: clean up timer-regs.h
hexagon: export raw I/O routines for modules
mm: emit the "free" trace report before freeing memory in kmem_cache_free()
shm: extend forced shm destroy to support objects from several IPC nses
ipc: WARN if trying to remove ipc object which is absent
mm/swap.c:put_pages_list(): reinitialise the page list
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/proc/vmcore.c | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c index 30a3b66f475a..509f85148fee 100644 --- a/fs/proc/vmcore.c +++ b/fs/proc/vmcore.c @@ -154,9 +154,13 @@ ssize_t read_from_oldmem(char *buf, size_t count, nr_bytes = count; /* If pfn is not ram, return zeros for sparse dump files */ - if (!pfn_is_ram(pfn)) - memset(buf, 0, nr_bytes); - else { + if (!pfn_is_ram(pfn)) { + tmp = 0; + if (!userbuf) + memset(buf, 0, nr_bytes); + else if (clear_user(buf, nr_bytes)) + tmp = -EFAULT; + } else { if (encrypted) tmp = copy_oldmem_page_encrypted(pfn, buf, nr_bytes, @@ -165,12 +169,12 @@ ssize_t read_from_oldmem(char *buf, size_t count, else tmp = copy_oldmem_page(pfn, buf, nr_bytes, offset, userbuf); - - if (tmp < 0) { - up_read(&vmcore_cb_rwsem); - return tmp; - } } + if (tmp < 0) { + up_read(&vmcore_cb_rwsem); + return tmp; + } + *ppos += nr_bytes; count -= nr_bytes; buf += nr_bytes; |