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Treat negative uio_offset value as eof (idea by: bde).

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Prevent overflows by casting uio_offset to uoff_t.
Return correct error number if directory entry is broken.

Reviewed by:	bde
This commit is contained in:
Boris Popov 2000-01-08 10:45:54 +00:00
parent f671bf82e4
commit 37713edc2d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=55594
2 changed files with 22 additions and 16 deletions
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19
sys/fs/msdosfs/msdosfs_vnops.c
View File

@ -566,8 +566,8 @@ msdosfs_read(ap)
if (uio->uio_offset < 0)
return (EINVAL);
if (uio->uio_offset > DOS_FILESIZE_MAX)
return (EFBIG);
if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX)
return (0);
/*
* If they didn't ask for any data, then we are done.
*/
@ -590,7 +590,10 @@ msdosfs_read(ap)
if (isadir) {
/* convert cluster # to block # */
error = pcbmap(dep, lbn, &lbn, 0, &blsize);
if (error)
if (error == E2BIG) {
error = EINVAL;
break;
} else if (error)
break;
error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp);
} else {
@ -676,24 +679,24 @@ msdosfs_write(ap)
}
if (uio->uio_offset < 0)
return (EINVAL);
return (EFBIG);
if (uio->uio_resid == 0)
return (0);
if (uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX)
return (EFBIG);
/*
* If they've exceeded their filesize limit, tell them about it.
*/
if (p &&
((uio->uio_offset + uio->uio_resid) >
((uoff_t)uio->uio_offset + uio->uio_resid >
p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) {
psignal(p, SIGXFSZ);
return (EFBIG);
}
if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX)
return (EFBIG);
/*
* If the offset we are starting the write at is beyond the end of
* the file, then they've done a seek. Unix filesystems allow

19
sys/msdosfs/msdosfs_vnops.c
View File

@ -566,8 +566,8 @@ msdosfs_read(ap)
if (uio->uio_offset < 0)
return (EINVAL);
if (uio->uio_offset > DOS_FILESIZE_MAX)
return (EFBIG);
if ((uoff_t)uio->uio_offset > DOS_FILESIZE_MAX)
return (0);
/*
* If they didn't ask for any data, then we are done.
*/
@ -590,7 +590,10 @@ msdosfs_read(ap)
if (isadir) {
/* convert cluster # to block # */
error = pcbmap(dep, lbn, &lbn, 0, &blsize);
if (error)
if (error == E2BIG) {
error = EINVAL;
break;
} else if (error)
break;
error = bread(pmp->pm_devvp, lbn, blsize, NOCRED, &bp);
} else {
@ -676,24 +679,24 @@ msdosfs_write(ap)
}
if (uio->uio_offset < 0)
return (EINVAL);
return (EFBIG);
if (uio->uio_resid == 0)
return (0);
if (uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX)
return (EFBIG);
/*
* If they've exceeded their filesize limit, tell them about it.
*/
if (p &&
((uio->uio_offset + uio->uio_resid) >
((uoff_t)uio->uio_offset + uio->uio_resid >
p->p_rlimit[RLIMIT_FSIZE].rlim_cur)) {
psignal(p, SIGXFSZ);
return (EFBIG);
}
if ((uoff_t)uio->uio_offset + uio->uio_resid > DOS_FILESIZE_MAX)
return (EFBIG);
/*
* If the offset we are starting the write at is beyond the end of
* the file, then they've done a seek. Unix filesystems allow