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Mukesh Ojha a4a62a23fa gcov: clang: fix the buffer overflow issue commit `a6f810efab` upstream. Currently, in clang version of gcov code when module is getting removed gcov_info_add() incorrectly adds the sfn_ptr->counter to all the dst->functions and it result in the kernel panic in below crash report. Fix this by properly handling it. [ 8.899094][ T599] Unable to handle kernel write to read-only memory at virtual address ffffff80461cc000 [ 8.899100][ T599] Mem abort info: [ 8.899102][ T599] ESR = 0x9600004f [ 8.899103][ T599] EC = 0x25: DABT (current EL), IL = 32 bits [ 8.899105][ T599] SET = 0, FnV = 0 [ 8.899107][ T599] EA = 0, S1PTW = 0 [ 8.899108][ T599] FSC = 0x0f: level 3 permission fault [ 8.899110][ T599] Data abort info: [ 8.899111][ T599] ISV = 0, ISS = 0x0000004f [ 8.899113][ T599] CM = 0, WnR = 1 [ 8.899114][ T599] swapper pgtable: 4k pages, 39-bit VAs, pgdp=00000000ab8de000 [ 8.899116][ T599] [ffffff80461cc000] pgd=18000009ffcde003, p4d=18000009ffcde003, pud=18000009ffcde003, pmd=18000009ffcad003, pte=00600000c61cc787 [ 8.899124][ T599] Internal error: Oops: 9600004f [#1] PREEMPT SMP [ 8.899265][ T599] Skip md ftrace buffer dump for: 0x1609e0 .... .., [ 8.899544][ T599] CPU: 7 PID: 599 Comm: modprobe Tainted: G S OE 5.15.41-android13-8-g38e9b1af6bce #1 [ 8.899547][ T599] Hardware name: XXX (DT) [ 8.899549][ T599] pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) [ 8.899551][ T599] pc : gcov_info_add+0x9c/0xb8 [ 8.899557][ T599] lr : gcov_event+0x28c/0x6b8 [ 8.899559][ T599] sp : ffffffc00e733b00 [ 8.899560][ T599] x29: ffffffc00e733b00 x28: ffffffc00e733d30 x27: ffffffe8dc297470 [ 8.899563][ T599] x26: ffffffe8dc297000 x25: ffffffe8dc297000 x24: ffffffe8dc297000 [ 8.899566][ T599] x23: ffffffe8dc0a6200 x22: ffffff880f68bf20 x21: 0000000000000000 [ 8.899569][ T599] x20: ffffff880f68bf00 x19: ffffff8801babc00 x18: ffffffc00d7f9058 [ 8.899572][ T599] x17: 0000000000088793 x16: ffffff80461cbe00 x15: 9100052952800785 [ 8.899575][ T599] x14: 0000000000000200 x13: 0000000000000041 x12: 9100052952800785 [ 8.899577][ T599] x11: ffffffe8dc297000 x10: ffffffe8dc297000 x9 : ffffff80461cbc80 [ 8.899580][ T599] x8 : ffffff8801babe80 x7 : ffffffe8dc2ec000 x6 : ffffffe8dc2ed000 [ 8.899583][ T599] x5 : 000000008020001f x4 : fffffffe2006eae0 x3 : 000000008020001f [ 8.899586][ T599] x2 : ffffff8027c49200 x1 : ffffff8801babc20 x0 : ffffff80461cb3a0 [ 8.899589][ T599] Call trace: [ 8.899590][ T599] gcov_info_add+0x9c/0xb8 [ 8.899592][ T599] gcov_module_notifier+0xbc/0x120 [ 8.899595][ T599] blocking_notifier_call_chain+0xa0/0x11c [ 8.899598][ T599] do_init_module+0x2a8/0x33c [ 8.899600][ T599] load_module+0x23cc/0x261c [ 8.899602][ T599] __arm64_sys_finit_module+0x158/0x194 [ 8.899604][ T599] invoke_syscall+0x94/0x2bc [ 8.899607][ T599] el0_svc_common+0x1d8/0x34c [ 8.899609][ T599] do_el0_svc+0x40/0x54 [ 8.899611][ T599] el0_svc+0x94/0x2f0 [ 8.899613][ T599] el0t_64_sync_handler+0x88/0xec [ 8.899615][ T599] el0t_64_sync+0x1b4/0x1b8 [ 8.899618][ T599] Code: f905f56c f86e69ec f86e6a0f 8b0c01ec (f82e6a0c) [ 8.899620][ T599] ---[ end trace ed5218e9e5b6e2e6 ]--- Link: https://lkml.kernel.org/r/1668020497-13142-1-git-send-email-quic_mojha@quicinc.com Fixes: `e178a5beb3` ("gcov: clang support") Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com> Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com> Tested-by: Peter Oberparleiter <oberpar@linux.ibm.com> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: Tom Rix <trix@redhat.com> Cc: <stable@vger.kernel.org> [5.2+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-12-02 17:40:04 +01:00
arch	nios2: add FORCE for vmlinuz.gz	2022-12-02 17:40:03 +01:00
block	block, bfq: fix null pointer dereference in bfq_bio_bfqg()	2022-12-02 17:39:58 +01:00
certs	certs/blacklist_hashes.c: fix const confusion in certs blacklist	2022-06-22 14:13:17 +02:00
crypto	crypto: akcipher - default implementation for setting a private key	2022-10-26 13:25:42 +02:00
Documentation	docs: update mediator contact information in CoC doc	2022-11-25 17:45:53 +01:00
drivers	usb: dwc3: gadget: Clear ep descriptor last	2022-12-02 17:40:04 +01:00
fs	nilfs2: fix nilfs_sufile_mark_dirty() not set segment usage as dirty	2022-12-02 17:40:04 +01:00
include	ceph: flush mdlog before umounting	2022-12-02 17:40:03 +01:00
init	init/Kconfig: fix CC_HAS_ASM_GOTO_TIED_OUTPUT test with dash	2022-12-02 17:40:03 +01:00
ipc	ipc: remove memcg accounting for sops objects in do_semtimedop()	2022-11-10 18:14:29 +01:00
kernel	gcov: clang: fix the buffer overflow issue	2022-12-02 17:40:04 +01:00
lib	lib/vdso: use "grep -E" instead of "egrep"	2022-12-02 17:40:02 +01:00
LICENSES	LICENSES/deprecated: add Zlib license text	2020-09-16 14:33:49 +02:00
mm	mm: fs: initialize fsdata passed to write_begin/write_end interface	2022-11-25 17:45:56 +01:00
net	ipv4: Fix error return code in fib_table_insert()	2022-12-02 17:40:01 +01:00
samples	x86: Prepare inline-asm for straight-line-speculation	2022-07-25 11:26:29 +02:00
scripts	stddef: Introduce struct_group() helper macro	2022-11-25 17:45:54 +01:00
security	capabilities: fix potential memleak on error path from vfs_getxattr_alloc()	2022-11-10 18:14:26 +01:00
sound	ASoC: soc-pcm: Don't zero TDM masks in __soc_pcm_open()	2022-12-02 17:39:59 +01:00
tools	selftests/bpf: Add verifier test for release_reference()	2022-12-02 17:39:58 +01:00
usr	usr/include/Makefile: add linux/nfc.h to the compile-test coverage	2022-02-01 17:25:48 +01:00
virt	kvm: Add support for arch compat vm ioctls	2022-10-30 09:41:15 +01:00
.clang-format	RDMA 5.10 pull request	2020-10-17 11:18:18 -07:00
.cocciconfig
.get_maintainer.ignore
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	kbuild: generate Module.symvers only when vmlinux exists	2021-05-19 10:12:59 +02:00
.mailmap	mailmap: add two more addresses of Uwe Kleine-König	2020-12-06 10:19:07 -08:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Move Jason Cooper to CREDITS	2020-11-30 10:20:34 +01:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	MAINTAINERS: add Amir as xfs maintainer for 5.10.y	2022-07-02 16:39:22 +02:00
Makefile	Linux 5.10.156	2022-11-25 17:45:57 +01:00
README

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.