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| author | Al Viro <viro@zeniv.linux.org.uk> | 2013-10-05 15:32:35 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2013-11-09 00:16:22 -0500 |
| commit | ecc8c7725e6c21528329b34acae2a1d64b3af89b (patch) | |
| tree | ae1790c2ce0fe1c1f02e2bd0795b6636d65b4587 /fs/coredump.c | |
| parent | 7d2f551f6dc933f87933e906e48583169bbc7c27 (diff) | |
| download | lwn-ecc8c7725e6c21528329b34acae2a1d64b3af89b.tar.gz lwn-ecc8c7725e6c21528329b34acae2a1d64b3af89b.zip | |
new helper: dump_emit()
dump_write() analog, takes core_dump_params instead of file,
keeps track of the amount written in cprm->written and checks for
cprm->limit. Start using it in binfmt_elf.c...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/coredump.c')
| -rw-r--r-- | fs/coredump.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/fs/coredump.c b/fs/coredump.c index 42c3b8423669..319f973bab72 100644 --- a/fs/coredump.c +++ b/fs/coredump.c @@ -693,6 +693,20 @@ int dump_write(struct file *file, const void *addr, int nr) } EXPORT_SYMBOL(dump_write); +int dump_emit(struct coredump_params *cprm, const void *addr, int nr) +{ + struct file *file = cprm->file; + if (dump_interrupted() || !access_ok(VERIFY_READ, addr, nr)) + return 0; + if (cprm->written + nr > cprm->limit) + return 0; + if (file->f_op->write(file, addr, nr, &file->f_pos) != nr) + return 0; + cprm->written += nr; + return 1; +} +EXPORT_SYMBOL(dump_emit); + int dump_seek(struct file *file, loff_t off) { int ret = 1; |