fix: Internal error: Accessing user space memory outside uaccess.h routines: 96000004 [#1] SMP#24
Open
LyleLee wants to merge 1 commit intoderekmolloy:version2from
Open
fix: Internal error: Accessing user space memory outside uaccess.h routines: 96000004 [#1] SMP#24LyleLee wants to merge 1 commit intoderekmolloy:version2from
LyleLee wants to merge 1 commit intoderekmolloy:version2from
Conversation
…ory outside uaccess.h routines: 96000004 [derekmolloy#1] SMP when I using an ARM server to test on ebbchar, I found segment fault and had kern.log as follow. It is because the const char* buffer point to user space address. And the later version of kernel seem to not allowed it. My enviroment: ARM64 server Linux ubuntu 4.15.0-29-generic derekmolloy#31-Ubuntu SMP Tue Jul 17 15:41:03 UTC 2018 aarch64 aarch64 aarch64 GNU/Linux The log: EBBChar: Initializing the EBBChar LKM EBBChar: registered correctly with major number 240 EBBChar: device class registered correctly EBBChar: device class created correctly EBBChar: Device has been opened 1 time(s) Internal error: Accessing user space memory outside uaccess.h routines: 96000004 [derekmolloy#1] SMP Modules linked in: ebbchar(OE) binfmt_misc nls_iso8859_1 joydev input_leds ipmi_ssif ipmi_si ipmi_devintf shpchp ipmi_msghandler sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ppdev lp parport nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic usbhid hid ses enclosure marvell hibmc_drm aes_ce_blk ttm aes_ce_cipher crc32_ce drm_kms_helper crct10dif_ce ghash_ce syscopyarea sha2_ce sysfillrect sysimgblt sha256_arm64 fb_sys_fops sha1_ce drm hisi_sas_v2_hw hisi_sas_main ehci_platform libsas scsi_transport_sas hns_dsaf hns_enet_drv hns_mdio hnae aes_neon_bs aes_neon_blk crypto_simd cryptd aes_arm64 [last unloaded: ebbchar] CPU: 17 PID: 10803 Comm: test Tainted: G W OE 4.15.0-29-generic derekmolloy#31-Ubuntu Hardware name: BC11SPCD, BIOS 1.58 10/24/2018 pstate: 20400005 (nzCv daif +PAN -UAO) pc : string+0x28/0xa0 lr : vsnprintf+0x5d4/0x730 sp : ffff000026ccbc90 x29: ffff000026ccbc90 x28: ffff000002ad40b2 x27: ffff000002ad40b2 x26: ffff000002ad5508 x25: 00000000ffffffd8 x24: 0000000000000020 x23: 000000007fffffff x22: ffff0000094f8000 x21: ffff000008c54b00 x20: ffff000082ad5507 x19: ffff000002ad5508 x18: 0000ffff8c2fda70 x17: 0000ffff8c26cb80 x16: ffff0000082e3a80 x15: 0000000000000000 x14: 0000000000000001 x13: 0000000000000000 x12: 0000000000000020 x11: ffff000026ccbdd0 x10: ffff000026ccbdd0 x9 : 00000000ffffffd0 x8 : fffffffffffffffe x7 : ffff000002ad5508 x6 : 0000ffffe94b6b18 x5 : 0000000000000000 x4 : 0000000000000043 x3 : ffff0a00ffffff04 x2 : ffff000082ad5507 x1 : ffff000082ad5507 x0 : ffffffffffffffff Process test (pid: 10803, stack limit = 0x00000000e31169af) Call trace: string+0x28/0xa0 vsnprintf+0x5d4/0x730 sprintf+0x68/0x88 dev_write+0x3c/0xb0 [ebbchar] __vfs_write+0x48/0x80 vfs_write+0xac/0x1b0 SyS_write+0x6c/0xd8 el0_svc_naked+0x30/0x34 Code: f13ffcdf d1000408 540002c9 b4000320 (394000c5) ---[ end trace 2b89326b0d5f8b9f ]--- EBBChar: Device successfully closed
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
use copy_from_user() to fix: Internal error: Accessing user space memory outside uaccess.h routines: 96000004 [#1] SMP
When I using an ARM server to test on ebbchar, I found segment fault at user space test program and had Internal error as follow. It is because the const char* buffer point to user space address. And the later version of kernel seem to not allowed it.
My enviroment:
ARM64 server
Linux ubuntu 4.15.0-29-generic #31-Ubuntu SMP Tue Jul 17 15:41:03 UTC 2018 aarch64 aarch64 aarch64 GNU/Linux
The log:
EBBChar: Initializing the EBBChar LKM
EBBChar: registered correctly with major number 240
EBBChar: device class registered correctly
EBBChar: device class created correctly
EBBChar: Device has been opened 1 time(s)
Internal error: Accessing user space memory outside uaccess.h routines: 96000004 [#1] SMP
Modules linked in: ebbchar(OE) binfmt_misc nls_iso8859_1 joydev input_leds ipmi_ssif ipmi_si ipmi_devintf shpchp ipmi_msghandler sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ppdev lp parport nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic usbhid hid ses enclosure marvell hibmc_drm aes_ce_blk ttm aes_ce_cipher crc32_ce drm_kms_helper crct10dif_ce ghash_ce syscopyarea sha2_ce sysfillrect sysimgblt sha256_arm64 fb_sys_fops sha1_ce drm hisi_sas_v2_hw hisi_sas_main ehci_platform libsas scsi_transport_sas hns_dsaf hns_enet_drv hns_mdio hnae aes_neon_bs aes_neon_blk
crypto_simd cryptd aes_arm64 [last unloaded: ebbchar]
CPU: 17 PID: 10803 Comm: test Tainted: G W OE 4.15.0-29-generic #31-Ubuntu
Hardware name: BC11SPCD, BIOS 1.58 10/24/2018
pstate: 20400005 (nzCv daif +PAN -UAO)
pc : string+0x28/0xa0
lr : vsnprintf+0x5d4/0x730
sp : ffff000026ccbc90
x29: ffff000026ccbc90 x28: ffff000002ad40b2
x27: ffff000002ad40b2 x26: ffff000002ad5508
x25: 00000000ffffffd8 x24: 0000000000000020
x23: 000000007fffffff x22: ffff0000094f8000
x21: ffff000008c54b00 x20: ffff000082ad5507
x19: ffff000002ad5508 x18: 0000ffff8c2fda70
x17: 0000ffff8c26cb80 x16: ffff0000082e3a80
x15: 0000000000000000 x14: 0000000000000001
x13: 0000000000000000 x12: 0000000000000020
x11: ffff000026ccbdd0 x10: ffff000026ccbdd0
x9 : 00000000ffffffd0 x8 : fffffffffffffffe
x7 : ffff000002ad5508 x6 : 0000ffffe94b6b18
x5 : 0000000000000000 x4 : 0000000000000043
x3 : ffff0a00ffffff04 x2 : ffff000082ad5507
x1 : ffff000082ad5507 x0 : ffffffffffffffff
Process test (pid: 10803, stack limit = 0x00000000e31169af)
Call trace:
string+0x28/0xa0
vsnprintf+0x5d4/0x730
sprintf+0x68/0x88
dev_write+0x3c/0xb0 [ebbchar]
__vfs_write+0x48/0x80
vfs_write+0xac/0x1b0
SyS_write+0x6c/0xd8
el0_svc_naked+0x30/0x34
Code: f13ffcdf d1000408 540002c9 b4000320 (394000c5)
---[ end trace 2b89326b0d5f8b9f ]---
EBBChar: Device successfully closed