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authorJann Horn <jannh@google.com>2020-10-15 20:12:43 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-10-16 11:11:21 -0700
commitdf0c09c0117300cd03f6e8532527bf591d4eee65 (patch)
treeb77a1adcf9afeedfdf8932e79a7e03d796a2f879 /fs/coredump.c
parent8f942eea12ae8c5a7cde85c145234b25e38de959 (diff)
downloadlinux-df0c09c0117300cd03f6e8532527bf591d4eee65.tar.bz2
coredump: let dump_emit() bail out on short writes
dump_emit() has a retry loop, but there seems to be no way for that retry logic to actually be used; and it was also buggy, writing the same data repeatedly after a short write. Let's just bail out on a short write. Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Jann Horn <jannh@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: "Eric W . Biederman" <ebiederm@xmission.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Hugh Dickins <hughd@google.com> Link: http://lkml.kernel.org/r/20200827114932.3572699-3-jannh@google.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/coredump.c')
-rw-r--r--fs/coredump.c22
1 files changed, 11 insertions, 11 deletions
diff --git a/fs/coredump.c b/fs/coredump.c
index 76e7c10edfc0..5e24c06092c9 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -840,17 +840,17 @@ int dump_emit(struct coredump_params *cprm, const void *addr, int nr)
ssize_t n;
if (cprm->written + nr > cprm->limit)
return 0;
- while (nr) {
- if (dump_interrupted())
- return 0;
- n = __kernel_write(file, addr, nr, &pos);
- if (n <= 0)
- return 0;
- file->f_pos = pos;
- cprm->written += n;
- cprm->pos += n;
- nr -= n;
- }
+
+
+ if (dump_interrupted())
+ return 0;
+ n = __kernel_write(file, addr, nr, &pos);
+ if (n != nr)
+ return 0;
+ file->f_pos = pos;
+ cprm->written += n;
+ cprm->pos += n;
+
return 1;
}
EXPORT_SYMBOL(dump_emit);