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Richard Yao
b815ec32b3
Userspace can trigger an assertion by passing a zero-length segment when assertions are enabled: [27961.614792] VERIFY3(skip < iov->iov_len) failed (0 < 0) [27961.614795] PANIC at zfs_uio.c:187:uio_prefaultpages() [27961.614805] Call Trace: [27961.614811] dump_stack+0x45/0x57 [27961.614830] spl_dumpstack+0x44/0x50 [spl] [27961.614834] spl_panic+0xbb/0x100 [spl] [27961.614908] uio_prefaultpages+0x134/0x140 [zcommon] [27961.614930] zfs_write+0x1fd/0xe80 [zfs] [27961.615014] zpl_write_common_iovec+0x7f/0x110 [zfs] [27961.615035] zpl_iter_write+0xa0/0xd0 [zfs] [27961.615037] do_iter_readv_writev+0x59/0x80 [27961.615063] do_readv_writev+0x11b/0x260 [27961.615098] vfs_writev+0x39/0x50 [27961.615100] SyS_writev+0x4a/0xe0 [27961.615103] system_call_fastpath+0x16/0x6e The solution is to delete the assertion. This could potentially occur in uiomove as well, which contains analogous assertions that appear similarly unnecessary, so we remove those as well. Reported-by: Jonathan Vasquez <jvasquez1011@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Richard Yao <ryao@gentoo.org> Issue #3792