diff --git a/SOURCES/CVE-2022-4378.patch b/SOURCES/CVE-2022-4378.patch new file mode 100644 index 0000000..d328f3a --- /dev/null +++ b/SOURCES/CVE-2022-4378.patch @@ -0,0 +1,264 @@ +From 794229b5711a96a488d85dd719511a278b4a4956 Mon Sep 17 00:00:00 2001 +From: Ryan Sullivan +Date: Fri, 27 Jan 2023 11:25:43 -0500 +Subject: [KPATCH CVE-2022-4378] kpatch fixes for CVE-2022-4378 + + +Kpatch-MR: https://gitlab.com/redhat/prdsc/rhel/src/kpatch/rhel-7/-/merge_requests/51 +Approved-by: Yannick Cote (@ycote1) +Approved-by: Joe Lawrence (@joe.lawrence) +Kernels: +3.10.0-1160.76.1.el7 +3.10.0-1160.80.1.el7 +3.10.0-1160.81.1.el7 +3.10.0-1160.83.1.el7 + +Changes since last build: +[x86_64]: +sysctl.o: changed function: __do_proc_dointvec +sysctl.o: changed function: __do_proc_douintvec +sysctl.o: changed function: __do_proc_doulongvec_minmax +sysctl.o: changed function: proc_dostring +sysctl.o: changed function: proc_get_long.constprop.13 + +[ppc64le]: +sysctl.o: changed function: __do_proc_doulongvec_minmax +sysctl.o: changed function: proc_do_cad_pid +sysctl.o: changed function: proc_dointvec +sysctl.o: changed function: proc_dointvec_jiffies +sysctl.o: changed function: proc_dointvec_minmax +sysctl.o: changed function: proc_dointvec_minmax_coredump +sysctl.o: changed function: proc_dointvec_minmax_sysadmin +sysctl.o: changed function: proc_dointvec_ms_jiffies +sysctl.o: changed function: proc_dointvec_userhz_jiffies +sysctl.o: changed function: proc_dopipe_max_size +sysctl.o: changed function: proc_dostring +sysctl.o: changed function: proc_dostring_coredump +sysctl.o: changed function: proc_douintvec +sysctl.o: changed function: proc_douintvec_minmax +sysctl.o: changed function: proc_doulongvec_minmax +sysctl.o: changed function: proc_doulongvec_ms_jiffies_minmax +sysctl.o: changed function: proc_get_long.constprop.13 +sysctl.o: changed function: sysrq_sysctl_handler +sysctl.o: new function: __do_proc_dointvec + +--------------------------- + +Modifications: +added '__attribute__((optimize("-fno-optimize-sibling-calls")))' to +proc_dointvec_jiffies(), proc_dointvec_ms_jiffies(), proc_doulongvec_ms_jiffies_minmax(), +proc_doulongvec_minmax(), proc_dointvec_userhz_jiffies(), and proc_dointvec() definitions. + +commit f4f6d6bf0cd6fc3d1b88341f784b2f7e8589ff61 +Author: Wander Lairson Costa +Date: Tue Dec 13 08:13:31 2022 -0300 + + proc: avoid integer type confusion in get_proc_long + + Bugzilla: https://bugzilla.redhat.com/2152565 + CVE: CVE-2022-4378 + + commit e6cfaf34be9fcd1a8285a294e18986bfc41a409c + Author: Linus Torvalds + Date: Mon Dec 5 11:33:40 2022 -0800 + + proc: avoid integer type confusion in get_proc_long + + proc_get_long() is passed a size_t, but then assigns it to an 'int' + variable for the length. Let's not do that, even if our IO paths are + limited to MAX_RW_COUNT (exactly because of these kinds of type errors). + + So do the proper test in the rigth type. + + Reported-by: Kyle Zeng + Signed-off-by: Linus Torvalds + + Signed-off-by: Wander Lairson Costa + +commit c727ac3f665ed51c096edeedf039552cea6053f6 +Author: Wander Lairson Costa +Date: Tue Dec 13 08:12:23 2022 -0300 + + proc: proc_skip_spaces() shouldn't think it is working on C strings + + Bugzilla: https://bugzilla.redhat.com/2152565 + CVE: CVE-2022-4378 + + Conflicts: some context hunks because we are way behind upstream. + + commit bce9332220bd677d83b19d21502776ad555a0e73 + Author: Linus Torvalds + Date: Mon Dec 5 12:09:06 2022 -0800 + + proc: proc_skip_spaces() shouldn't think it is working on C strings + + proc_skip_spaces() seems to think it is working on C strings, and ends + up being just a wrapper around skip_spaces() with a really odd calling + convention. + + Instead of basing it on skip_spaces(), it should have looked more like + proc_skip_char(), which really is the exact same function (except it + skips a particular character, rather than whitespace). So use that as + inspiration, odd coding and all. + + Now the calling convention actually makes sense and works for the + intended purpose. + + Reported-and-tested-by: Kyle Zeng + Acked-by: Eric Dumazet + Signed-off-by: Linus Torvalds + + Signed-off-by: Wander Lairson Costa + +Signed-off-by: Ryan Sullivan +--- + kernel/sysctl.c | 36 +++++++++++++++++++++--------------- + 1 file changed, 21 insertions(+), 15 deletions(-) + +diff --git a/kernel/sysctl.c b/kernel/sysctl.c +index 62e2788cf09a..6f7d80afda89 100644 +--- a/kernel/sysctl.c ++++ b/kernel/sysctl.c +@@ -1999,13 +1999,14 @@ int proc_dostring(struct ctl_table *table, int write, + (char __user *)buffer, lenp, ppos); + } + +-static size_t proc_skip_spaces(char **buf) ++static void proc_skip_spaces(char **buf, size_t *size) + { +- size_t ret; +- char *tmp = skip_spaces(*buf); +- ret = tmp - *buf; +- *buf = tmp; +- return ret; ++ while (*size) { ++ if (!isspace(**buf)) ++ break; ++ (*size)--; ++ (*buf)++; ++ } + } + + static void proc_skip_char(char **buf, size_t *size, const char v) +@@ -2074,13 +2075,12 @@ static int proc_get_long(char **buf, size_t *size, + unsigned long *val, bool *neg, + const char *perm_tr, unsigned perm_tr_len, char *tr) + { +- int len; + char *p, tmp[TMPBUFLEN]; ++ ssize_t len = *size; + +- if (!*size) ++ if (len <= 0) + return -EINVAL; + +- len = *size; + if (len > TMPBUFLEN - 1) + len = TMPBUFLEN - 1; + +@@ -2250,7 +2250,7 @@ static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, + bool neg; + + if (write) { +- left -= proc_skip_spaces(&kbuf); ++ proc_skip_spaces(&kbuf, &left); + + if (!left) + break; +@@ -2281,7 +2281,7 @@ static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, + if (!write && !first && left && !err) + err = proc_put_char(&buffer, &left, '\n'); + if (write && !err && left) +- left -= proc_skip_spaces(&kbuf); ++ proc_skip_spaces(&kbuf, &left); + free: + if (write) { + free_page(page); +@@ -2331,7 +2331,7 @@ static int do_proc_douintvec_w(unsigned int *tbl_data, + if (IS_ERR(kbuf)) + return -EINVAL; + +- left -= proc_skip_spaces(&p); ++ proc_skip_spaces(&p, &left); + if (!left) { + err = -EINVAL; + goto out_free; +@@ -2351,7 +2351,7 @@ static int do_proc_douintvec_w(unsigned int *tbl_data, + } + + if (!err && left) +- left -= proc_skip_spaces(&p); ++ proc_skip_spaces(&p, &left); + + out_free: + kfree(kbuf); +@@ -2457,6 +2457,7 @@ static int do_proc_douintvec(struct ctl_table *table, int write, + * + * Returns 0 on success. + */ ++__attribute__((optimize("-fno-optimize-sibling-calls"))) + int proc_dointvec(struct ctl_table *table, int write, + void __user *buffer, size_t *lenp, loff_t *ppos) + { +@@ -2775,7 +2776,7 @@ static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int + if (write) { + bool neg; + +- left -= proc_skip_spaces(&kbuf); ++ proc_skip_spaces(&kbuf, &left); + + err = proc_get_long(&kbuf, &left, &val, &neg, + proc_wspace_sep, +@@ -2800,7 +2801,7 @@ static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int + if (!write && !first && left && !err) + err = proc_put_char(&buffer, &left, '\n'); + if (write && !err) +- left -= proc_skip_spaces(&kbuf); ++ proc_skip_spaces(&kbuf, &left); + free: + if (write) { + free_page(page); +@@ -2839,6 +2840,7 @@ static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, + * + * Returns 0 on success. + */ ++__attribute__((optimize("-fno-optimize-sibling-calls"))) + int proc_doulongvec_minmax(struct ctl_table *table, int write, + void __user *buffer, size_t *lenp, loff_t *ppos) + { +@@ -2862,6 +2864,7 @@ int proc_doulongvec_minmax(struct ctl_table *table, int write, + * + * Returns 0 on success. + */ ++__attribute__((optimize("-fno-optimize-sibling-calls"))) + int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, + void __user *buffer, + size_t *lenp, loff_t *ppos) +@@ -2957,6 +2960,7 @@ static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, + * + * Returns 0 on success. + */ ++__attribute__((optimize("-fno-optimize-sibling-calls"))) + int proc_dointvec_jiffies(struct ctl_table *table, int write, + void __user *buffer, size_t *lenp, loff_t *ppos) + { +@@ -2979,6 +2983,7 @@ int proc_dointvec_jiffies(struct ctl_table *table, int write, + * + * Returns 0 on success. + */ ++__attribute__((optimize("-fno-optimize-sibling-calls"))) + int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, + void __user *buffer, size_t *lenp, loff_t *ppos) + { +@@ -3002,6 +3007,7 @@ int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, + * + * Returns 0 on success. + */ ++__attribute__((optimize("-fno-optimize-sibling-calls"))) + int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, + void __user *buffer, size_t *lenp, loff_t *ppos) + { +-- +2.39.1 + + diff --git a/SPECS/kpatch-patch.spec b/SPECS/kpatch-patch.spec index ce322a2..982c1c7 100644 --- a/SPECS/kpatch-patch.spec +++ b/SPECS/kpatch-patch.spec @@ -6,13 +6,16 @@ %define kernel_ver 3.10.0-1160.80.1.el7 %define kpatch_ver 0.9.2 %define rpm_ver 1 -%define rpm_rel 1 +%define rpm_rel 2 %if !%{empty_package} # Patch sources below. DO NOT REMOVE THIS LINE. # # https://bugzilla.redhat.com/2130096 Source100: CVE-2022-2964.patch +# +# https://bugzilla.redhat.com/2152592 +Source101: CVE-2022-4378.patch # End of patch sources. DO NOT REMOVE THIS LINE. %endif @@ -147,6 +150,9 @@ It is only a method to subscribe to the kpatch stream for kernel-%{kernel_ver}. %endif %changelog +* Tue Feb 21 2023 Yannick Cote [1-2.el7] +- kernel: stack overflow in do_proc_dointvec and proc_skip_spaces [2152592] {CVE-2022-4378} + * Tue Jan 10 2023 Yannick Cote [1-1.el7] - kernel: memory corruption in AX88179_178A based USB ethernet device. [2130096] {CVE-2022-2964}