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Subject[PATCH v2] Documentation/proc.txt: Add 2 missing fields for /proc/<pid>/status
It was found that two of the fields in the /proc/<pid>/status file were
missing - CapAmb & Speculation_Store_Bypass. They are now added to the
proc.txt documentation file.

v2: Update the example as well.

Signed-off-by: Waiman Long <>
Documentation/filesystems/proc.txt | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index 22b4b00..baccfee 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -193,8 +193,10 @@ read the file /proc/PID/status:
CapPrm: 0000000000000000
CapEff: 0000000000000000
CapBnd: ffffffffffffffff
+ CapAmb: 0000000000000000
NoNewPrivs: 0
Seccomp: 0
+ Speculation_Store_Bypass: thread vulnerable
voluntary_ctxt_switches: 0
nonvoluntary_ctxt_switches: 1

@@ -214,7 +216,7 @@ asynchronous manner and the value may not be very precise. To see a precise
snapshot of a moment, you can see /proc/<pid>/smaps file and scan page table.
It's slow but very precise.

-Table 1-2: Contents of the status files (as of 4.8)
+Table 1-2: Contents of the status files (as of 4.19)
Field Content
Name filename of the executable
@@ -267,8 +269,10 @@ Table 1-2: Contents of the status files (as of 4.8)
CapPrm bitmap of permitted capabilities
CapEff bitmap of effective capabilities
CapBnd bitmap of capabilities bounding set
+ CapAmb bitmap of ambient capabilities
NoNewPrivs no_new_privs, like prctl(PR_GET_NO_NEW_PRIV, ...)
Seccomp seccomp mode, like prctl(PR_GET_SECCOMP, ...)
+ Speculation_Store_Bypass speculative store bypass mitigation status
Cpus_allowed mask of CPUs on which this process may run
Cpus_allowed_list Same as previous, but in "list format"
Mems_allowed mask of memory nodes allowed to this process
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